Aerosol for controlling mosquitoes and method for controlling mosquitoes

Abstract

To provide an aerosol for mosquito control that can exhibit excellent mosquito control effects for a long period of time while improving the operational stability of a metered injection valve after repeated use and that reduces the effects on the human body and pets. [Solution] This mosquito control aerosol comprises a pressure-resistant container in which aerosol concentrate and propellant containing the pest control ingredients transfluthrin and / or metofluthrin and the organic solvent lower alcohol and / or hydrocarbon solvent are sealed, a metered-dose spray valve 100 having a housing 20 and a valve mechanism 10 including a stem 11, stem rubber 12, and spring 13, and a spray button with a spray nozzle, wherein the volume ratio of the aerosol concentrate to the propellant is 6 / 94 to 50 / 50, the stem rubber 12 is made of acrylonitrile butadiene rubber, and the spring 13 is a reinforced spring.

Description

[Technical field]

[0001] The present invention relates to an aerosol for mosquito control, which includes a pressure-resistant container in which an aerosol concentrate containing a pest control ingredient and an organic solvent and a propellant are sealed, a metered-amount spray valve that is attached to the mouth of the pressure-resistant container, and a spray button provided with a spray port connected to the metered-amount spray valve, and a mosquito control method using the same. [Background technology]

[0002] Methods for exterminating flying pests include, for example, a method of evaporating the agent containing an insecticidal component from a carrier impregnated with the agent and volatilizing it into the treatment space, a method of directly spraying the agent on the flying pests, and a method of spraying the agent in advance in places where flying pests are likely to appear. Regarding these methods, aerosol insecticides containing insecticidal components have been developed as products for exterminating flying pests that invade indoors. Aerosol insecticides are widely used as easy-to-use products because the insecticidal components can be easily sprayed into the treatment space.

[0003] Conventionally, there have been aerosol insecticides that suppress the decrease in the residual rate of the insecticide in the air indoors (for example, see Patent Document 1). According to Patent Document 1, after the insecticide is released, it is possible to maintain the insecticide in the air and suppress the decrease in the airborne concentration, thereby maintaining a sufficient extermination effect against mosquitoes hiding in the shadows.

[0004] There is also an aerosol insecticide in which the particle size when sprayed indoors is set to be larger than that of Patent Document 1 (see, for example, Patent Document 2). Patent Document 2 is an aerosol insecticide based on the same technical concept as Patent Document 1, and aims to leave the insecticide in the air indoors for as long as possible, thereby increasing the insecticidal effect against mosquitoes.

[0005] Meanwhile, there is a method for exterminating flying pests in a house, characterized in that an aerosol insecticide is attached to the surface of an indoor structure or fixture (see, for example, Patent Document 3). According to Patent Document 3, a specific compound attached to an indoor structure or the like evaporates, so that flying pests in a house can be efficiently exterminated by a simple means without the need for repeated spraying or continuous operation of an electric appliance or the like.

[0006] In addition, in light of the widespread use of metered-dose aerosol insecticides, the inventors have developed a pest control method using a metered-dose aerosol that uses at least one pest control component selected from the group consisting of metofluthrin, profluthrin, and transfluthrin, and a lower alcohol having 2 to 3 carbon atoms as a solvent, and has specified the spray force, the particle size distribution of the spray particles, and the adhesion efficiency of the spray particles to indoor floors and walls, thereby capable of controlling both flying and crawling pests in a treated space for 5 to 12 hours (see Patent Document 4). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2001-17055 A [Patent Document 2] JP 2013-99336 A [Patent Document 3] JP 2001-328913 A [Patent Document 4] Patent No. 5517496 Summary of the Invention [Problem to be solved by the invention]

[0008] The aerosol insecticide of Patent Document 1 attempts to increase the duration of the insecticide by adjusting the particle size of the insecticide that diffuses indoors to increase the time the insecticide remains in the air. However, the airborne residual rate of the insecticide particles is 0.5% or more 12 hours or more after the start of treatment, and the aerosol insecticide of Patent Document 1, which aims to maintain the airborne residual rate, has a limited duration. In Patent Document 2, the airborne residual rate of the insecticide particles is the same as in Patent Document 1, and it is not an aerosol insecticide that can be expected to last a long time.

[0009] Among the mosquitoes to be controlled (including not only ordinary mosquitoes such as Culex pipiens and Aedes albopictus, but also chironomids and moth flies belonging to the suborder Culicidae), Culex pipiens and Aedes albopictus in particular are mosquitoes that not only suck blood but also transmit infectious diseases, so it is necessary to protect oneself from these mosquitoes, and there is a demand for the establishment of more effective extermination methods than ever before.Mosquitoes are flying pests that invade indoors at any time of the day or night, so an insecticide that is effective all day, that is, for 24 hours, is ideal.

[0010] However, as mentioned above, the aerosol insecticides disclosed in Patent Document 1 and Patent Document 2 only last for about 12 hours. In addition, Patent Document 1 and Patent Document 2 actively allow the insecticide to remain in the air by adjusting the particle size of the insecticide, but the fact that the insecticide particles remain in the air means that the people and pets in the treatment space are in an environment where they inhale the insecticide for a long time. Therefore, it is difficult to say that these aerosol insecticides are preferable in terms of their effects on the human body and pets.

[0011] It is unclear whether the extermination method of Patent Document 3 can maintain a stable effect for a long time. It is considered that the drug particles sprayed into the air follow one of the following behaviors: (A) remain suspended in the air, (B) adhere to the floor or wall, (C) volatilize again after (B), or (D) decompose and disappear due to light or the like. In light of these, the extermination method of Patent Document 3 corresponds to type (C). However, when the drug adhering to the indoor structure or the like volatilizes again into the air, it is easily affected by temperature, air volume, etc., so the extermination method of Patent Document 3 does not necessarily have a stable effect on exterminating flying pests.

[0012] The lower alcohol having 2 to 3 carbon atoms used as a solvent in the pest control method of Patent Document 4 has a higher drying rate than other solvents such as higher fatty acid esters, and evaporates quickly after spraying, increasing the concentration of pest control components in the sprayed particles and improving the control effect, making it a highly useful solvent for a constant-dose aerosol. However, the pest control effect of the aerosol insecticide used in the pest control method of Patent Document 4 only lasts for about 12 hours. In addition, the present inventors conducted various studies on a constant-dose aerosol using a lower alcohol having 2 to 3 carbon atoms as a solvent, and found that repeated use of the constant-dose aerosol may affect the operational stability of the constant-dose valve, and the aerosol insecticide of Patent Document 4 still has room for improvement.

[0013] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a mosquito control aerosol that can exhibit excellent control effects against flying pests, particularly mosquitoes, for a long period of time while improving the operational stability of a metered dose injection valve after repeated use, and that reduces the impact on the human body and pets, and a mosquito control method using the mosquito control aerosol. [Means for solving the problem]

[0014] The characteristic configuration of the mosquito control aerosol according to the present invention for solving the above problems is as follows: a pressure-resistant container in which an aerosol concentrate containing the pest control ingredients transfluthrin and / or metofluthrin and the organic solvent lower alcohol and / or hydrocarbon solvent, and a propellant are enclosed; a constant-volume injection valve having a valve mechanism including a stem, a stem rubber, and a spring, and a housing that accommodates the valve mechanism, the constant-volume injection valve being assembled to the mouth of the pressure-resistant container; an injection button provided with an injection port connected to the metered injection valve; A mosquito control aerosol comprising: a volume ratio (a / b) of the aerosol concentrate (a) to the propellant (b) is 6 / 94 to 50 / 50; The material of the stem rubber is acrylonitrile butadiene rubber, The spring is a reinforced spring, The ejection volume when the ejection button is pressed once is 0.1 to 1.0 mL, The particle diameter of the spray particles sprayed from the spray nozzle is 10 to 80 μm as a 90% particle diameter in a volume cumulative distribution at 25° C. and a spray distance of 15 cm.

[0015] As described in "Problems to be Solved by the Invention," conventional aerosol insecticides have been developed to actively disperse drug particles in the treatment space and to prolong the time they remain in the air as much as possible. However, if the retention time of drug particles suspended in the treatment space is long, there is a possibility that people or pets may inhale the drug particles if they enter the treatment space, which may have an adverse effect on their health.

[0016] Meanwhile, the inventors' research has revealed that mosquitoes, such as mosquitoes (hereinafter, in the present invention, simply referred to as "mosquitoes"), spend more time resting on walls and the like than flying. In other words, most of the mosquitoes that invade indoors stay on walls and the like, waiting for an opportunity to suck human blood. For this reason, the conventional method of lengthening the time that drug particles in the treatment space remain suspended can have a certain effect on controlling flying mosquitoes, but the drug cannot be fully effective on mosquitoes resting on walls and the like, resulting in incomplete mosquito control. Based on the above research results, the inventors thought that improving the control effect on mosquitoes resting on walls and the like would lead to improved control of all mosquitoes that invade indoors, while suppressing people and pets from inhaling the drug.

[0017] Therefore, in the mosquito control aerosol of the present invention, when the aerosol concentrate is sprayed into the treatment space, the sprayed particles move to the exposed parts in the treatment space (for example, the floor surface, wall surface, and the surface of a structure such as furniture present in the treatment space) and adhere to the exposed parts. This makes it possible to effectively knock down or kill both mosquitoes that are resting on the exposed parts and mosquitoes that are flying in the treatment space, thereby improving the overall mosquito control effect. Regarding the sprayed particles of the aerosol, the present inventors have found, after extensive research, that the use of an aerosol concentrate that uses transfluthrin and / or metofluthrin as the pest control ingredient and a lower alcohol and / or a hydrocarbon solvent as the organic solvent is advantageous in forming particles suitable for mosquito control. In this case, the effect of the pest control ingredient contained in the sprayed particles can be reliably and efficiently exerted. In addition, the aerosol concentrate can be easily prepared.

[0018] Next, when the volume ratio (a / b) of the aerosol concentrate (a) and the propellant (b) is adjusted to 6 / 94 to 50 / 50 and the spray volume when the spray button is pressed once is adjusted to 0.1 to 1.0 mL, the spray particles quickly move to and adhere to the exposed area in the treatment space. As a result, the mosquitoes resting on the exposed area can be reliably knocked down or killed by the pest control component.

[0019] Furthermore, the particle diameter of the spray particles is formed so that the 90% particle diameter in the volume cumulative distribution at 25° C. and a spray distance of 15 cm is in the range of 10 to 80 μm. If the particle diameter is in this range, mosquitoes resting on exposed areas can be reliably knocked down or killed by the pest control component.

[0020] In addition, the metered dose injection valve for mosquito control aerosol of the present invention has a valve mechanism including a stem, stem rubber, and a spring, and a housing that accommodates the valve mechanism. By using acrylonitrile butadiene rubber as the material for the stem rubber and a reinforced spring as the spring, the operational stability of the metered dose injection valve is improved, and the injection button returns to its original position well when pressed, even after repeated use of the mosquito control aerosol.

[0021] In the aerosol for mosquito control according to the present invention, The strengthening spring preferably has a spring constant of 3.3 N / mm or more.

[0022] In the mosquito control aerosol of this configuration, a spring with a spring constant of 3.3 N / mm or more is used as the spring, which further improves the operational stability of the fixed-dose spray valve, and ensures that the spray button of the mosquito control aerosol returns to its original position even if it is pressed repeatedly many times, thereby enabling the quality and performance of the aerosol to be maintained over a long period of time.

[0023] In the aerosol for mosquito control according to the present invention, The pest control component is preferably transfluthrin.

[0024] According to the mosquito control aerosol of this configuration, when the pest control ingredient is transfluthrin, mosquitoes can be controlled more effectively.

[0025] In the aerosol for mosquito control according to the present invention, When the aerosol concentrate is sprayed once into a treatment space, the residual rate of the pest control ingredient in the air after 2 hours is 0.05 to 5%, and the effect of the pest control ingredient lasts for 33.3 m. 3 It is preferable for the following spaces to be at least 18 hours.

[0026] According to the mosquito control aerosol of this configuration, when the aerosol concentrate is sprayed once into the treatment space, the residual rate of the pest control ingredient in the air (within the treatment space) after 2 hours is 0.05 to 5%, and the effect of the pest control ingredient lasts for 33.3 m. 3 The sprayed particles sprayed into the treatment space move quickly to and adhere to the exposed parts in the treatment space by adjusting the sprayed particles to the space below for 18 hours or more. Meanwhile, the sprayed particles floating in the treatment space are reduced by the amount of the sprayed particles that adhere to the exposed parts. In other words, the mosquito control aerosol of the present invention does not disperse the aerosol concentrate throughout the treatment space as in conventional products, so the risk of affecting the human body or pets is significantly reduced compared to conventional products. Furthermore, the pest control components of the sprayed particles floating in the treatment space can knock down or kill mosquitoes flying in the treatment space. Moreover, with the mosquito control aerosol of the present invention, spraying the aerosol concentrate into the treatment space just once can knock down or kill mosquitoes flying in the treatment space. 3 The pest control effect can be sustained for more than 18 hours in the following spaces, allowing you to maintain a comfortable space that keeps pests away for most of the day.

[0027] In the aerosol for mosquito control according to the present invention, The particle diameter of the spray particles sprayed from the spray nozzle is preferably 25 to 70 μm in terms of 90% particle diameter in a volume cumulative distribution at 25° C. and a spray distance of 15 cm.

[0028] According to the mosquito control aerosol of this configuration, the spray particles are adjusted to the above-mentioned optimum range, so that the spray particles move and adhere to the exposed parts in the treatment space more quickly, and therefore the mosquitoes resting on the exposed parts can be knocked down or killed more reliably.

[0029] In the aerosol for mosquito control according to the present invention, It is preferable that the ejection volume when the ejection button is pressed once is 0.1 to 0.2 mL.

[0030] According to the mosquito control aerosol of this configuration, by adjusting the spray volume to the optimal range as described above, the sprayed particles are present in a more suitable state, and the effect of the pest control component can be maximized.

[0031] In the aerosol for mosquito control according to the present invention, The amount of the pest control component sprayed when the spray button is pressed once is 18.8 to 33.3 m 3 It is preferable that the amount of the sintering agent is 5.0 to 30 mg per treatment space.

[0032] According to the mosquito control aerosol of this configuration, the amount of the pest control component sprayed when the spray button is pressed once is adjusted to be within the above-mentioned optimal range, so that the spray particles quickly move to and adhere to the exposed part in the treatment space, and as a result, the mosquitoes resting on the exposed part can be reliably knocked down or killed by the pest control component.

[0033] In the aerosol for mosquito control according to the present invention, The organic solvent is preferably a lower alcohol having 2 to 3 carbon atoms.

[0034] According to the mosquito control aerosol of this configuration, when the organic solvent is a lower alcohol having 2 to 3 carbon atoms, the effect of the pest control ingredient can be exhibited more efficiently.

[0035] In the aerosol for mosquito control according to the present invention, The aerosol concentrate preferably contains a higher fatty acid ester having a total of 13 to 20 carbon atoms and / or a glycol having a total of 3 to 6 carbon atoms as an auxiliary agent for dealing with reduced sensitivity to transfluthrin.

[0036] According to the mosquito control aerosol of this configuration, when used in combination with transfluthrin, the higher fatty acid esters having a total of 13 to 20 carbon atoms and / or glycols having a total of 3 to 6 carbon atoms act as auxiliary agents for dealing with reduced susceptibility, and can therefore exert a high control effect even against mosquitoes with reduced susceptibility to transfluthrin.

[0037] The characteristic configuration of the mosquito control method according to the present invention for solving the above problems is as follows: The object of the present invention is to use any one of the above-mentioned mosquito control aerosols to spray the aerosol concentrate into a treatment space to knock down or kill mosquitoes.

[0038] The mosquito control method of the present invention is carried out using the mosquito control aerosol of the present invention, and therefore can achieve the excellent mosquito control effect as described above. [Brief description of the drawings]

[0039] [Figure 1] FIG. 1 is a cross-sectional view of a constant-dose injection valve provided with an aerosol for controlling mosquitoes according to the present invention. [Diagram 2] FIG. 2 is a model diagram showing the behavior of sprayed particles when the aerosol concentrate is sprayed into the treatment space. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0040] The mosquito control aerosol of the present invention comprises a pressure-resistant container in which an aerosol concentrate containing the pest control ingredients transfluthrin and / or metofluthrin and a lower alcohol and / or a hydrocarbon solvent used as an organic solvent, and a propellant are enclosed, a metered-amount injection valve attached to the mouth of the pressure-resistant container, and an injection button provided with an injection port connected to the metered-amount injection valve. The mosquito control aerosol of the present invention will be described below. However, the present invention is not intended to be limited to the configurations shown in the embodiments and drawings described below.

[0041] <Aerosol concentrate> [Pest control ingredient] As the pest control component, which is one of the main components of the aerosol concentrate, transfluthrin and / or metofluthrin, which are pyrethroid compounds, are used. In addition, transfluthrin and metofluthrin have optical isomers and geometric isomers based on asymmetric carbons, which are also included in the present invention. A preferred pest control component is transfluthrin. Transfluthrin can deal more advantageously with flying pests that have reduced sensitivity to pyrethroid compounds than metofluthrin and profluthrin. Therefore, when transfluthrin is used as the pest control component, the aerosol for mosquito control of the present invention has a relatively small decrease in its control effect even against flying pests that are pyrethroid-resistant.

[0042] The content of the pest control component in the aerosol concentrate is preferably 1.0 to 60% by weight, taking into consideration that the pest control component is dissolved in a lower alcohol and / or a hydrocarbon solvent used as an organic solvent and then sprayed into the treatment space. In this range, the pest control component is easily dissolved in a lower alcohol and / or a hydrocarbon solvent (organic solvent), and when the aerosol concentrate is sprayed, the spray particles are formed in an optimal state, and the effect of the pest control component can be exerted. If the content of the pest control component in the aerosol concentrate is less than 1.0% by weight, the pest control component cannot be effectively exerted, and the mosquito control effect is insufficient. On the other hand, if the content of the pest control component in the aerosol concentrate exceeds 60% by weight, the concentration of the pest control component becomes high, making it difficult to properly prepare the aerosol concentrate.

[0043] As described above, the pest control components contained in the mosquito control aerosol of the present invention are transfluthrin and / or metofluthrin. In addition, it is also possible to contain other pyrethroid compounds such as profluthrin, mepafluthrin, empenthrin, dimefluthrin, monfluorothrin, heptafluthrin, phthalthrin, resmethrin, cyfluthrin, fenothrin, permethrin, cyphenothrin, cypermethrin, allethrin, prallethrin, furamethrin, imiprothrin, and etofenprox, silicon-based compounds such as silafluofen, organophosphorus compounds such as dichlorvos and fenitrothion, and carbamate compounds such as propoxur.

[0044] The pest control component is preferably adjusted so that when the aerosol concentrate is sprayed once into the treatment space, the residual rate in the air (in the treatment space) after 2 hours is 0.05 to 5%. The residual rate in the air is expressed as the ratio of the number of particles (Q) present in the treatment space after a predetermined time has elapsed to the number of particles (P) present in the treatment space immediately after spraying, i.e., Q / P × 100 (%), but can be calculated simply from the theoretical air concentration (weight basis) of the pest control component and the air concentration (weight basis) of the pest control component after a predetermined time has elapsed, as will be described in the Examples below. The spray amount of the aerosol concentrate is 18.8 to 33.3 m as the spray amount of transfluthrin. 3 Treatment space (area 7.5~13.3m 2 It is preferable to adjust the amount of the aerosol to 5.0 to 30 mg per 1000 m2 (equivalent to a room of 4.5 to 8 tatami mats with a height of 2.2 to 3.0 m). Within this range, the spray particles are optimally formed from the aerosol concentrate, and the pest control effect can be exhibited. Even if the residual rate in the air is relatively low as described above, it is possible to effectively knock down or kill mosquitoes. Furthermore, even if people or pets in the treatment space inhale the aerosol, there is no risk of adverse effects on the human body or pets, and the aerosol can be used safely.

[0045] [Organic solvents] The main components of the aerosol concentrate include an organic solvent in addition to the pest control components described above. The organic solvent can prepare the aerosol concentrate by dissolving the pest control components described above, and can form optimal spray particles when the prepared aerosol concentrate is sprayed into the treatment space. In the aerosol for controlling mosquitoes of the present invention, a lower alcohol and / or a hydrocarbon solvent is used as the organic solvent. The lower alcohol preferably has 2 to 3 carbon atoms. Examples of the lower alcohol having 2 to 3 carbon atoms include ethanol, normal propanol, and isopropanol (IPA). Examples of the hydrocarbon solvent include normal paraffin and isoparaffin. Among these, a lower alcohol having 2 to 3 carbon atoms is preferred, and ethanol is particularly preferred. A lower alcohol having 2 to 3 carbon atoms has high quick-drying properties and volatilizes quickly after spraying, so that the concentration of the pest control component in the spray particles is increased, particles suitable for mosquito control are formed, and the effect of the pest control component contained in the spray particles can be reliably and efficiently exhibited. In addition, the aerosol concentrate can be easily prepared. Furthermore, glycol ethers and the like can be further mixed as the organic solvent.

[0046] [Hyposensitivity treatment aid] The aerosol concentrate preferably contains a higher fatty acid ester having a total of 13 to 20 carbon atoms and / or a glycol having a total of 3 to 6 carbon atoms as an auxiliary agent for dealing with reduced sensitivity to pyrethroid compounds. Examples of higher fatty acid esters having a total of 13 to 20 carbon atoms include isopropyl myristate (IPM), methyl myristate, hexyl laurate, and isopropyl laurate. Examples of glycols having a total of 3 to 6 carbon atoms include 1,3-butylene glycol, 1,4-butylene glycol, dipropylene glycol, 1,2-hexanediol, and 1,6-hexanediol. The present inventors have found that the above-mentioned higher fatty acid esters having a total of 13 to 20 carbon atoms and glycols having a total of 3 to 6 carbon atoms are specifically effective against pests, particularly mosquitoes, whose sensitivity to pyrethroid compounds has been reduced, and that their action can be utilized as an auxiliary agent for dealing with reduced sensitivity. Adding these to the aerosol concentrate at 2.0 to 20% by weight can particularly enhance the usefulness. In addition, conventionally, compounds that enhance the original insecticidal effect against pests susceptible to pyrethroids are often called "potentiators", but in this specification, compounds that reduce the degree of decrease in control effect when targeting pests with reduced susceptibility are distinguished from conventional "potentiators" and defined as "adjuvants for dealing with reduced susceptibility". Although the action mechanisms of both have not been clearly elucidated, "potentiators" do not necessarily correspond to "adjuvants for dealing with reduced susceptibility". If the amount of the adjuvants for dealing with reduced susceptibility is less than 2.0% by weight, the effect of reducing the degree of decrease in pest control effect is poor. On the other hand, if the amount exceeds 20% by weight, not only will the pest control effect reach a plateau, but there is also a concern that the properties of the aerosol concentrate will be affected.

[0047] [Other ingredients] In addition to the above-mentioned components, the mosquito control aerosol of the present invention may also contain a nonionic surfactant as a solubilizing aid in the aerosol concentrate. Examples of nonionic surfactants include ethers such as polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, and polyoxyethylene alkylamino ethers, fatty acid esters such as polyethylene glycol fatty acid esters, polyoxyethylene sorbitan fatty acid esters, and polyoxyethylene glycerin fatty acid esters, polyoxyethylene styrenated phenol, and polyalkalolamide of fatty acid, and among these, ethers can be preferably used.

[0048] In addition, it is also possible to appropriately mix in acaricides, antifungal agents for molds and fungi, antibacterial agents, bactericides, fragrances, deodorants, stabilizers, antistatic agents, antifoaming agents, excipients, synergists, etc. Examples of acaricides include 5-chloro-2-trifluoromethanesulfonamido methyl benzoate, phenyl salicylate, 3-iodo-2-propynyl butylcarbamate, etc. Examples of antifungal agents, antibacterial agents, and bactericides include hinokitiol, 2-mercaptobenzothiazole, 2-(4-thiazolyl)benzimidazole, 5-chloro-2-methyl-4-isothiazolin-3-one, triforine, 3-methyl-4-isopropylphenol, ortho-phenylphenol, etc. Examples of the fragrances include orange oil, lemon oil, lavender oil, peppermint oil, eucalyptus oil, citronella oil, lime oil, yuzu oil, jasmine oil, cypress oil, green tea essential oil, limonene, α-pinene, linalool, geraniol, phenylethyl alcohol, amyl cinnamic aldehyde, cumin aldehyde, benzyl acetate, and other fragrance components, such as leaf alcohol and leaf aldehyde, which are called "green scents." Examples of synergists include piperonyl butoxide and octyl bicycloheptene dicarboximide.

[0049] <Propellant> Examples of propellants used in the mosquito control aerosol of the present invention include liquefied gases such as liquefied petroleum gas (LPG), dimethyl ether (DME), and hydrofluoroolefins, and compressed gases such as nitrogen gas, carbon dioxide gas, nitrous oxide, and compressed air. The above propellants can be used alone or in a mixed state, but those containing LPG as the main component are easy to use.

[0050] The mosquito control aerosol of the present invention is adjusted so that the volume ratio (a / b) of the aerosol concentrate (a) and the propellant (b) is 6 / 94 to 50 / 50. By adjusting to such a range, the spray particles can be optimally formed from the spray port connected to the constant-volume spray valve provided in the pressure-resistant container. The spray particles once sprayed can quickly move to and adhere to the exposed part in the treatment space. On the other hand, the spray particles that do not adhere to the exposed part among the spray particles will float in the treatment space, but exist in an amount that does not affect the human body or pets. In this way, the spray particles exist in the treatment space in an optimal state, and the pest control effect can be maximized. If the ratio of the propellant (b) is increased with respect to the volume ratio (a / b) of 6 / 94, that is, if a large amount of the propellant is enclosed in the pressure-resistant container, the spray particles formed from the sprayed aerosol concentrate are finer than necessary, and the amount of spray particles that adhere to the exposed part in the treatment space is reduced. As a result, it may not be possible to reliably control mosquitoes that are resting on the exposed part. On the other hand, when the volume ratio (a / b) is 50 / 50, if the proportion of propellant (b) is reduced, that is, the amount of propellant enclosed in the pressure-resistant container is reduced, it becomes difficult to form the sprayed particles in the above-mentioned optimal range from the sprayed aerosol concentrate, and the sprayed sprayed particles immediately settle. Therefore, the amount of sprayed particles becomes insufficient, making it difficult to knock down or kill mosquitoes quickly.

[0051] <Mosquito control aerosol> The mosquito control aerosol according to the present invention is mainly composed of a pressure-resistant container (aerosol container), a metered-volume injection valve, and an injection button. As described above, the pest control ingredient, organic solvent, propellant, and other ingredients to be mixed as necessary are selected, and these are sealed in a pressure-resistant container with a metered-volume injection valve attached to the mouth, and an injection button with an injection port is connected to the metered-volume injection valve to complete the aerosol product. This aerosol product is the mosquito control aerosol of the present invention, and is for injecting the aerosol concentrate as injection particles into the treatment space. The aerosol concentrate mainly contains the pest control ingredient and the organic solvent, and is strictly speaking different from the propellant, but since the aerosol concentrate is released outside the pressure-resistant container at the same time as the propellant, in the following explanation, the aerosol contents including the aerosol concentrate and the propellant may be referred to as the "aerosol concentrate".

[0052] <Fixed-volume injection valve> FIG. 1 is a cross-sectional view of a constant-volume injection valve 100 provided in the mosquito control aerosol according to the present invention. The constant-volume injection valve 100 is fixed to the mouth of a pressure-resistant container and connected to an injection button. The injection button is an operating part for injecting the aerosol concentrate, and this injection button is provided with an injection port through which the aerosol concentrate is ejected from the aerosol container to the outside (treatment space). The constant-volume injection valve 100 has a valve mechanism 10 including a stem 11, a stem rubber 12, and a spring 13, and a housing 20 that accommodates the valve mechanism 10. A reinforced spring is used for the spring 13. In addition, acrylonitrile butadiene rubber is used as the material for the stem rubber 12. The lower alcohol having 2 to 3 carbon atoms used as the organic solvent in the mosquito control aerosol according to the present invention dries quickly compared to other solvents such as higher fatty acid esters and volatilizes quickly after spraying, so the concentration of the pest control component in the sprayed particles increases. In this respect, it is a highly useful solvent for aerosols of a fixed-volume type, but there is a possibility that it may affect the operational stability of a fixed-volume injection valve after repeated use of the aerosol. One possible means of improving the operational stability of a fixed-volume injection valve after repeated use is to modify the material of the stem rubber, but there are many factors to consider when verifying the compatibility of a solvent with the stem rubber. In consideration of this point, in addition to (1) modifying the material of the stem rubber, (2) focusing on changes to the structural specifications, it has been discovered that the operational stability of a fixed-volume injection valve can be improved by using acrylonitrile butadiene rubber as the material for the stem rubber and adopting a reinforced spring as the spring, and this invention has been completed. It is preferable that the reinforced spring has a spring constant of 3.3 N / mm or more. Here, the spring constant is calculated based on the following formula (1): Spring constant (N / mm) = (modulus of transverse elasticity × fourth power of wire diameter) / (8 × number of effective turns × third power of center diameter) (1) The spring constant can be calculated from the formula: Spring constant = 3.3 N / mm. An example of a spring with a spring constant of 3.3 N / mm or more is a reinforced spring (product number: SP-C321) manufactured by Mitani Valve Co., Ltd. According to a catalog published by Mitani Valve Co., Ltd., a conventional spring (product number: SP-C314) is made of stainless steel (SUS304), has a wire diameter of φ0.55 mm, and has 9 3 / 4 turns, whereas the reinforced spring has a wire diameter that is thicker than φ0.55 mm to φ0.6 mm, and has a higher spring pressure.

[0053] In the constant-volume injection valve 100, a predetermined amount of the aerosol concentrate is introduced from a pressure-resistant container into the constant-volume injection chamber 21, and when the injection button of the mosquito control aerosol is pressed once, the constant-volume injection valve 100 is operated by the pressure of the propellant, and the aerosol concentrate in the constant-volume injection chamber 21 rises to the injection port and is injected into the treatment space. The injection volume of the aerosol concentrate at this time is adjusted to 0.1 to 1.0 mL, preferably 0.1 to 0.2 mL. According to the mosquito control aerosol of the present invention, the stem rubber made of acrylonitrile butadiene rubber and the reinforced spring work together to improve the operating stability of the constant-volume injection valve, and the injection volume of the aerosol concentrate is further stabilized. If the injection volume of the aerosol concentrate is within the above range, the injection particles formed from the injected aerosol concentrate can exhibit an optimal control effect in the treatment space. If the spray volume is less than 0.1 mL, the spray volume is too small, so the amount of spray particles moving to the exposed part in the treatment space is small, and the amount of spray particles adhering to the exposed part is insufficient, making it difficult to knock down or kill mosquitoes that are resting on the exposed part. In addition, since the total amount of spray particles is small, the amount of spray particles floating in the treatment space is also small, making it difficult to knock down or kill mosquitoes flying in the treatment space. On the other hand, if the spray volume exceeds 1.0 mL, an excessive amount of aerosol concentrate is released into the treatment space as spray particles, which may have an adverse effect on people and pets. In addition, the amount of aerosol concentrate used is excessive, which is economically disadvantageous.

[0054] In addition, the amount of pest control ingredient sprayed is, as mentioned above, 18.8 to 33.3 m 3The amount of the ionizing radiation is adjusted to 5.0 to 30 mg per 18.8 to 33.3 m of treatment space, and preferably adjusted to 6.1 to 25 mg per 18.8 to 33.3 m of treatment space. 3 The space corresponds to a room of 4.5 to 8 tatami mats. In this range, the pest control effect is properly exerted, and the mosquitoes in the treatment space can be knocked down or killed reliably. If the amount of the pest control component sprayed is less than 5.0 mg, the amount of sprayed particles adhering to the exposed part in the treatment space is small, so the effect of the pest control component is inferior, and it is difficult to knock down or kill the mosquitoes resting on the exposed part. On the other hand, if the amount of the pest control component sprayed exceeds 30 mg, an excessive amount of the pest control component is released into the treatment space, which may have an adverse effect on people and pets. In addition, the amount of the pest control component used is excessive, which is economically disadvantageous.

[0055] The mosquito control aerosol of the present invention is adjusted so that the spray force at a point 20 cm away from the nozzle is 0.3 to 20.0 g·f at 25°C, preferably 0.3 to 10.0 g·f. If the spray force is within this range, the spray particles sprayed from the nozzle by one spray can reach the exposed part in the treatment space quickly, and the effect of the pest control component can be exerted. Such a spray force can be appropriately adjusted depending on the composition of the aerosol concentrate, the internal pressure of the aerosol container, the shape of the nozzle, and the like. In this embodiment, the spray force of the mosquito control aerosol was measured using a digital force gauge (FGC-0.5, manufactured by Nidec-Shimpo Corporation). Furthermore, the nozzle diameter of the nozzle is preferably set to 0.2 to 1.0 mm. If the spray force is within this range, the above particle diameter and spray force can be appropriately adjusted, the spray particles are optimally formed from the aerosol concentrate sprayed into the treatment space, the pest control effect can be exerted, and the mosquitoes in the treatment space can be reliably knocked down or killed.

[0056] FIG. 2 is a model diagram showing the behavior of spray particles formed from the aerosol concentrate when the aerosol concentrate is sprayed into the treatment space. FIG. 2(a) is a model diagram when a mosquito control aerosol according to a conventional product is sprayed into the treatment space, and FIG. 2(b) is a model diagram when a mosquito control aerosol according to the present invention is sprayed into the treatment space. As shown in FIG. 2(a), when a conventional mosquito control aerosol product (simply referred to as a "conventional product") sprays an aerosol concentrate into the treatment space, it becomes particles M with a particle diameter of less than 10 μm and diffuses into the treatment space. After a while from the spraying, the particles M further diffuse throughout the treatment space, and the pest control component spreads throughout the treatment space. This makes it possible to knock down or kill mosquitoes flying in the treatment space. However, as described above, mosquitoes spend more time staying on the exposed parts of the treatment space than they fly, so conventional products cannot reliably knock down or kill mosquitoes staying on the exposed parts of the treatment space. In addition, when wind blows in by opening a window in the treatment space, some of the particles M suspended in the treatment space are carried away by the wind, and the effect of the pest control component is greatly reduced. Furthermore, if the particles M are suspended in the treatment space for a long time, the amount of particles M inhaled by people and pets in the treatment space increases, which may have a negative effect on the human body and pets. Therefore, the present inventors have developed a new aerosol product for mosquito control that solves these problems. The following describes the characteristic spray particles in the aerosol product for mosquito control according to the present invention.

[0057] [Sprayed particles] As shown in FIG. 2(b), when the aerosol concentrate is sprayed once into the treatment space, spray particles R are formed from the aerosol concentrate. The sprayed spray particles R move quickly to and adhere to the exposed parts in the treatment space. Here, the spray particles R that are attached to the exposed parts among the spray particles R are referred to as particles X (shown as white circles in FIG. 2(b). Hereinafter, particle X means "spray particles R that are attached to the exposed parts among the spray particles R"). On the other hand, the spray particles R that are not attached to the exposed parts and are floating in the treatment space are referred to as particles Y (shown as black circles in FIG. 2(b). Hereinafter, particle Y means "spray particles R that are not attached to the exposed parts among the spray particles R and are floating in the treatment space"). The preferred particle diameter of the spray particles R that move to and adhere to the exposed parts (i.e., exist as particles X) is 10 to 80 μm in the 90% particle diameter in the volume cumulative distribution at 25° C. and a spray distance of 15 cm. Within this range, the spray particles R sprayed into the treatment space will reliably move to and adhere to the exposed areas in the treatment space as shown in FIG. 2(b), becoming particles X. As a result, the mosquitoes that are resting on the exposed areas can be knocked down or killed by the pest control component of the spray particles. In addition, the pest control effect is also exerted on mosquitoes that have entered the treatment space and are attempting to rest on the exposed areas, so that it is possible to drive them out of the treatment space. If the particle diameter of the spray particles R is less than 10 μm, the particle diameter is too small and the amount of the spray particles R that reaches the exposed areas is reduced. For this reason, it is difficult to control mosquitoes that are resting on or attempting to rest on the exposed areas. On the other hand, if the particle diameter exceeds 80 μm, the particle diameter is too large and it is difficult to control the behavior of the spray particles R, making it difficult to properly adhere to the exposed areas. A more preferable particle diameter of the spray particles R is 25 to 70 μm, which is a 90% particle diameter in a volume cumulative distribution at 25° C. and a spray distance of 15 cm. In Fig. 2(b), for convenience of explanation, particle X is shown as a white circle and particle Y is shown as a black circle to distinguish between particle X and particle Y, but both particles are the same particle and originate from spray particle R. In this embodiment, the 90% particle size in the volume cumulative distribution of spray particles of the mosquito control aerosol at 25°C and a spray distance of 15 cm was measured using a Spraytec (STP5321, manufactured by Malvern).

[0058] In addition, the preferred amount of the spray particles R attached to the exposed portion in the processing space is 1 m 2 The concentration is 0.01 to 0.4 mg per m 2 Within this range, mosquitoes resting on exposed areas can be effectively knocked down or killed. 2 If the amount of adhesion is less than 0.01 mg per m, it is not possible to exert a sufficient control effect on mosquitoes resting on exposed areas, making it difficult to knock down or kill the mosquitoes. 2 If the amount exceeds 0.4 mg per unit area, the pest control effect will not improve significantly, and the amount of the aerosol concentrate used will be excessive, which is economically disadvantageous.

[0059] Like the above-mentioned particle X, particle Y can also exert a pest control effect on mosquitoes. Although particle Y cannot knock down or kill mosquitoes resting on exposed areas, it can effectively knock down or kill mosquitoes flying in the treatment space. In addition, since it is effective against mosquitoes that try to invade the treatment space, it is also possible to suppress their intrusion into the treatment space. In this way, the sprayed particle R sprayed into the treatment space exists in the state of particle X or particle Y, and by making use of each state, it is possible to effectively knock down or kill mosquitoes in the treatment space.

[0060] As described above, immediately after the aerosol concentrate is sprayed once into the treatment space, the sprayed particles R move quickly to the exposed part in the treatment space and become particles X in an attached state and particles Y in a state of floating in the treatment space without attaching to the exposed part. Even after a while has passed since the first spray, the particles X maintain a state of attachment to the exposed part, and the mosquitoes resting on the exposed part can be knocked down or killed by the pest control component. On the other hand, the particles Y are diffused evenly throughout the entire treatment space, and the pest control component gradually volatilizes, so that the mosquitoes flying in the treatment space can be knocked down or killed. In addition, it is possible to prevent the intrusion of mosquitoes that try to enter the treatment space. Even if a mosquito does invade the treatment space, if the mosquito stops on the exposed part in the treatment space or approaches the exposed part, it can be reliably knocked down or killed by the pest control component of the particles X attached to the exposed part. In this way, the mosquito control aerosol according to the present invention has the spray particles R sprayed from the nozzle in an optimal state (the state of particles X and Y), and can maximize the pest control effect. Therefore, it can be said to be a useful product that can exert an excellent control effect against both mosquitoes present in the treatment space and mosquitoes that try to invade the treatment space.

[0061] In addition, when wind blows into the treatment space, even if some of the particles Y are blown away by the wind, there are particles X attached to the exposed part. As described above, most of the mosquitoes present in the treatment space stay on the exposed part for a long time, so if the particles X can exert the desired effect, there is no need to worry about the control effect on mosquitoes being inferior even if the amount of particles Y is reduced. Furthermore, in the mosquito control aerosol of the present invention, unlike conventional products, almost all of the sprayed aerosol concentrate is not diffused into the treatment space. The concentration of the pest control component diffused in the treatment space (i.e., the pest control component by the particles Y) is reduced by the amount of the particles X. Therefore, the concentration in the treatment space is lower than that of conventional products, and the impact on the human body and pets caused by inhalation of the pest control component is reduced, and the product can be provided as a safe product.

[0062] The duration of the effect of the pest control component when the aerosol concentrate of the mosquito control aerosol of the present invention is sprayed once into a treatment space is 33.3 m. 3 For the following spaces, the recommended storage time is 18 hours or more, and more preferably 20 hours or more. 3 As described above, the following space includes a living room of 4.5 to 8 tatami mats (ceiling height 2.5 m). Therefore, the mosquito control aerosol according to the present invention can maintain the pest control effect for almost a whole day in a normal living space such as a general house. Mosquitoes invade indoors regardless of day or night, and it is particularly necessary to prevent them from sucking blood while sleeping. The mosquito control aerosol according to the present invention maintains the effect of the pest control ingredient for more than 20 hours, so for example, if it is sprayed once before going to bed at night, the effect will continue until the afternoon of the next day, allowing you to sleep in peace.

[0063] <Mosquito control methods> The mosquito control method of the present invention is carried out using the above-mentioned mosquito control aerosol. First, in a pressure-resistant container provided with a constant-dose injection valve that contains an aerosol concentrate containing transfluthrin and / or metofluthrin as pest control ingredients, a lower alcohol and / or a hydrocarbon solvent used as an organic solvent, and a propellant, when a spray button provided with an injection port connected to the constant-dose injection valve is pressed once, the aerosol concentrate is sprayed from the injection port into the treatment space as spray particles R (spraying step). At this time, as shown in FIG. 2(b), the spray particles R quickly move to the exposed part in the treatment space and become particles X that are attached to the exposed part, and particles Y that are floating in the treatment space without attaching to the exposed part. Among the spray particles R, particles X knock down or kill mosquitoes that are resting on the surfaces of walls, floors, structures, etc. in the treatment space, or are effective against mosquitoes that are trying to rest in these places, driving them out of the treatment space. On the other hand, among the spray particles R, the particles Y can knock down or kill mosquitoes flying in the treatment space, and are also effective against mosquitoes that try to invade the treatment space, suppressing their intrusion into the treatment space. The pest control effect of the spray particles R as described above is 33.3m 3The effect lasts for a long period of time of 18 hours or more, preferably 20 hours or more, in the following spaces: After the specified time has elapsed, the aerosol concentrate can be sprayed again into the treatment space, thereby knocking down or killing mosquitoes continuously.

[0064] As described above, the mosquito control aerosol of the present invention has an effect duration of 33.3 m. 3 For the following spaces, the treatment time is 18 hours or more, preferably 20 hours or more, i.e., approximately one day. Therefore, in the mosquito control method carried out using this mosquito control aerosol, the operation can be completed by simply performing the spraying step of spraying once a day at a fixed time every day. In this way, anyone can easily spray the aerosol concentrate into the treatment space, and it is possible to prevent missing the timing of the spraying. EXAMPLES

[0065] In order to confirm the operational stability of the metered dose injection valve and the mosquito control effect of the mosquito control aerosol of the present invention after repeated use, mosquito control aerosols having the characteristic configuration of the present invention (Examples 1 to 13) were prepared and tested. For comparison, mosquito control aerosols not having the characteristic configuration of the present invention (Comparative Examples 1 to 6, Reference Examples 1 and 2) were prepared and similar tests were performed.

[0066] For Examples 1 to 13, mosquito control aerosols were prepared with the compositions and conditions shown in Table 1, and the following tests were carried out. In Example 2, IPM (15% by weight) was blended as an auxiliary agent for reducing susceptibility, in Example 3, 1,3-butylene glycol (15% by weight) was blended as an auxiliary agent for reducing susceptibility, and in Example 5, IPM (10% by weight) was blended as an auxiliary agent for reducing susceptibility. For Comparative Examples 1 to 6 and Reference Examples 1 and 2, mosquito control aerosols were also prepared with the compositions and conditions shown in Table 1, and tests similar to those of the Examples were carried out. In all of the mosquito control aerosols, acrylonitrile butadiene rubber was used as the material for the stem rubber of the metered dose injection valve. In the mosquito control aerosols of Comparative Examples 1 and 2, a conventional spring ("A" in Table 1, wire diameter 0.55 mm, transverse elastic modulus 6.85×10 4 , central diameter 3.15 mm, number of effective turns 7.75, spring constant 3.24 N / mm) was used in the mosquito control aerosols of Examples 1 to 13, Comparative Examples 3 to 6, and Reference Examples 1 and 2. 4 , center diameter 3.2 mm, effective number of turns 8, spring constant 4.23 N / mm) were used.

[0067] [Table 1]

[0068] (1) Operational stability of the metered injection valve after repeated use The test mosquito control aerosol was used repeatedly to check the return state of the spray button, and the operational stability of the metered dose spray valve after repeated use was evaluated according to the following evaluation criteria. A: The ejection button remains in its original position even after 20 or more uses. b: The ejection button returns to its original position after 3 to 7 uses. c: The ejection button returns to its original position after 1-2 uses.

[0069] (2) Efficacy against adult mosquitoes Closed 25m 3In the center of the room, a mosquito control aerosol was sprayed once diagonally upwards, and immediately after this, 50 adult female Culex pipiens mosquitoes were released and exposed for 2 hours, after which all the test mosquitoes were collected. During this time, the number of adult female Culex pipiens mosquitoes that fell and turned over over time was counted, and the KT 50 The value (min) was calculated. In the same room, the same operation was carried out 12 hours and 18 hours after one spray of the mosquito control aerosol. In Examples 1 to 10, Comparative Examples 1 to 6, and Reference Examples 1 and 2, two types of adult female Culex pipiens mosquitoes were used, a pyrethroid-susceptible strain and a pyrethroid-resistant strain. In Examples 11 to 13, only the pyrethroid-susceptible strain was used as the adult female Culex pipiens mosquitoes.

[0070] (3) Remaining rate of sprayed particles in the air Closed 25m 3 The mosquito control aerosol was sprayed once diagonally upwards toward the center of the room. An air collection tube (a glass tube filled with silica gel and both ends plugged with absorbent cotton) was placed 50 cm behind the center of the room (130 cm from the wall) and 120 cm above the floor, and connected to a vacuum pump to suck in a specified amount of air two hours after the spraying treatment. The air collection tube was washed with acetone, and the amount of the captured pest control component was analyzed by gas chromatography (Shimadzu Corporation, Model GC1700). Based on the obtained analytical values, the air concentration (weight basis) of the pest control component was calculated, and the ratio to the theoretical air concentration was calculated as the air residual rate.

[0071] The test results (1) to (3) above are shown in Table 2.

[0072] [Table 2]

[0073] In Examples 1 to 13, in which a reinforced spring with a spring constant of 3.3 N / mm or more was used in the metered injection valve, the return state of the injection button did not change even after 20 or more uses, and the operation stability of the metered injection valve after repeated use was good. On the other hand, in Comparative Examples 1 to 2, in which a conventional spring with a spring constant of less than 3.3 N / mm was used in the metered injection valve, the return state of the injection button deteriorated after 3 to 7 uses, and the operation stability of the metered injection valve after repeated use could not be said to be particularly good. In addition, even if a reinforced spring with a spring constant of 3.3 N / mm or more was used as in Comparative Example 3, when methyl ethyl ketone was used as the organic solvent, the return state of the injection button deteriorated significantly after 1 to 2 uses, which may lead to poor injection. This is thought to be because methyl ethyl ketone deteriorated the acrylonitrile butadiene rubber and reduced the elasticity of the stem rubber. In this way, the compatibility of the stem rubber material with organic solvents is an extremely important item to consider, and it was found that even if a reinforced spring with a spring constant of 3.3 N / mm or more is used, if the organic solvent has an adverse effect on the acrylonitrile butadiene rubber, it is not possible to improve the operational stability of the metered injection valve after repeated use.

[0074] Regarding the control effect against adult mosquitoes, in Examples 1 to 13, the KT was still not observed 18 hours after a single spray of a mosquito control aerosol containing transfluthrin and / or metofluthrin as a pest control ingredient. 50 It was confirmed that the value was maintained at a significant value, and an excellent mosquito control effect was exhibited. Furthermore, although the blending amount of transfluthrin was the same in Example 1, which used ethanol as the organic solvent, Example 4, which used isopropanol as the organic solvent, and Example 10, which used neothiosol as the organic solvent, the mosquito control effect was excellent in Examples 1 and 4, and in particular, the mosquito control effect of Example 1 was even more excellent. This shows that, as an organic solvent to be combined with the pest control ingredient transfluthrin, among lower alcohols and / or hydrocarbon solvents, lower alcohols having 2 to 3 carbon atoms (ethanol or isopropanol) are effective, and among these, ethanol is more effective.

[0075] Furthermore, the amount of transfluthrin was the same in Example 1, which did not contain a susceptibility-reducing auxiliary, and in Examples 2 and 3, which contained a susceptibility-reducing auxiliary, but the degree of decrease in control efficacy against pyrethroid-resistant Culex pipiens mosquitoes with reduced susceptibility to pyrethroid compounds was smaller than that in Example 1, compared to the case where pyrethroid-susceptible mosquitoes were targeted. From this, it was confirmed that the incorporation of higher fatty acid esters such as isopropyl myristate or glycols with 3 to 6 carbon atoms such as 1,3-butylene glycol as a susceptibility-reducing auxiliary is extremely effective in controlling pyrethroid-resistant mosquitoes. In addition, in Reference Examples 1 and 2, in which profluthrin was used as a pest control ingredient, the control effect against pyrethroid-resistant Culex pipiens mosquitoes was significantly inferior to the case where pyrethroid-susceptible mosquitoes were targeted, and the degree of decrease was not improved even when isopropyl myristate was added. Therefore, transfluthrin remains effective against pyrethroid-resistant strains of mosquitoes, and it was also found that higher fatty acid esters such as isopropyl myristate and glycols with 3 to 6 carbon atoms such as 1,3-butylene glycol are particularly useful as adjuvants for reducing susceptibility when combined with transfluthrin as a pest control ingredient.

[0076] On the other hand, in Comparative Example 3, in which methyl ethyl ketone was used as the organic solvent, the KT 50 The value was 120 minutes or more, and the control effect against mosquitoes was not exerted for a long period of time. Comparative Examples 4 and 5, in which the volume ratio (a / b) of the aerosol concentrate (a) and the propellant (b) was outside the range of 6 / 94 to 50 / 50, and Comparative Example 6, in which the spray volume when the spray button was pressed once was outside the range of 0.1 to 1.0 mL, showed a KT of 12 hours after the mosquito control aerosol was sprayed once. 50 The value was more than 120 minutes, and the mosquito control effect was not observed for a long period of time. [Industrial Applicability]

[0077] According to the present invention, it is possible to provide an aerosol for mosquito control having a high control effect against mosquitoes, and a method for controlling mosquitoes using the same. [Explanation of symbols]

[0078] 10 Valve mechanism 11 Stem 12 Stem Rubber 13 Spring (reinforced spring) 20. Housing 21 Quantification room 100 Fixed-volume injection valve R spray particles X: Spray particles adhering to exposed areas Y: Injected particles floating in the processing space

Claims

1. a pressure-resistant container in which an aerosol concentrate containing transfluthrin and / or metofluthrin as pest control ingredients and a lower alcohol and / or a hydrocarbon solvent as an organic solvent and a propellant are enclosed; a constant-volume injection valve having a valve mechanism including a stem, a stem rubber, and a spring, and a housing that accommodates the valve mechanism, the constant-volume injection valve being assembled to the mouth of the pressure-resistant container; an injection button provided with an injection port connected to the metered injection valve; A mosquito control aerosol for treating a space of 18.8 to 33.3 m 3 , the volume ratio (a / b) of the aerosol concentrate (a) to the propellant (b) is 6 / 94 to 50 / 50; The material of the stem rubber is acrylonitrile butadiene rubber, The spring is a reinforced spring, The ejection volume when the ejection button is pressed once is 1.0 mL, The mosquito control aerosol has a particle diameter of 10 to 80 μm as a 90% particle diameter in a volume cumulative distribution at 25° C. and a spray distance of 15 cm sprayed from the nozzle.

2. The mosquito control aerosol according to claim 1, wherein the reinforced spring has a spring constant of 3.3 N / mm or more.

3. 3. The mosquito control aerosol according to claim 1, wherein the reinforced spring has a wire diameter of 0.6 mm or more.

4. The mosquito control aerosol according to any one of claims 1 to 3, wherein the pest control ingredient is transfluthrin.

5. The mosquito control aerosol according to any one of claims 1 to 4, wherein the organic solvent is a lower alcohol having 2 to 3 carbon atoms.

6. The mosquito control aerosol according to claim 4 or 5, wherein the aerosol concentrate contains a higher fatty acid ester having a total of 13 to 20 carbon atoms and / or a glycol having a total of 3 to 6 carbon atoms as an auxiliary agent for dealing with reduced sensitivity to transfluthrin.

7. A mosquito control method comprising spraying the aerosol concentrate into the treatment space using the mosquito control aerosol according to any one of claims 1 to 6 to knock down or kill mosquitoes.

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