Metered spray-type aerosol for pest control

Abstract

To provide a metered spray-type aerosol for pest control that uses pyrethrin, which is a natural insecticidal component, as a pest control component, the aerosol being capable of exhibiting sufficient pest control efficacy directly upon application and also reducing an unpleasant odor resulting from pyrethrin, and to provide a method for pest control.SOLUTION: A metered spray-type aerosol for pest control comprises: an aerosol base solution that contains a pest control component consisting solely of pyrethrin and a solvent; and a propellant, the aerosol base solution and the propellant being charged into an aerosol container provided with a metered spray valve, wherein the amount of pyrethrin released per one spray operation is 0.03-0.2 mg / m3.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a fixed-dose type pest control aerosol that uses pyrethrin, a natural insecticidal ingredient, as a pest control ingredient. [Background technology]

[0002] Fixed-volume aerosols are known that spray a fixed amount of an aerosol composition consisting of an aerosol concentrate containing an active ingredient and a solvent and a propellant in a single spray operation, and have become widely used in homes for the purpose of exterminating pests such as small flies and mosquitoes. For fixed-dose aerosols used indoors, attempts have been made to extend the duration of pest control effects by adjusting the particle size of the spray particles and the type of organic solvent (Patent Document 1, etc.). On the other hand, in recent years, consumers have become concerned about chemically synthesized insecticidal ingredients remaining in the air for long periods of time, and as a result, there is a growing demand for pest control products that use natural insecticidal ingredients. In addition, because modern homes are airtight and have fewer opportunities for pests to invade indoors, there is a demand for new pest control products that provide sufficient pest control effects immediately after use, and do not necessarily require long-term or preventive pest control effects. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-027982 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention aims to provide a fixed-dose type pest control aerosol that uses pyrethrin, a natural insecticidal ingredient, as a pest control ingredient, and that can provide sufficient pest control effect immediately after use and reduce unpleasant odors derived from pyrethrin, and a pest control method thereof. [Means for solving the problem]

[0005] As a result of intensive research into solving the above problems, the inventors have discovered that by setting the amount of pyrethrin ejected per spray operation in the range of 1 to 5 mg, a fixed-dose pest control aerosol can be obtained that provides sufficient pest control effect immediately after use and has reduced unpleasant odors derived from pyrethrin, thereby completing the present invention.

[0006] In detail, the present invention relates to the following items. 1. A fixed-dose spray type pest control aerosol, which is obtained by filling an aerosol concentrate containing a pest control ingredient consisting only of pyrethrin, a solvent, and a propellant into an aerosol container equipped with a fixed-dose spray valve, and which is characterized in that the amount of pyrethrin sprayed per spray operation is 1 to 5 mg. 2. The constant-dose aerosol for controlling pests according to 1., wherein the solvent is an alcohol having 2 to 3 carbon atoms. 3. A fixed-volume spray type aerosol for pest control according to 1. or 2., wherein the amount sprayed per spray operation is 0.1 to 0.9 mL. 4. A fixed-volume spray type pest control aerosol is prepared by filling an aerosol concentrate containing pyrethrin, a pest control ingredient, a solvent, and a propellant into an aerosol container equipped with a fixed-volume spray valve, and the amount of pyrethrin sprayed per spray operation is 1 to 5 mg. The amount of pyrethrin released is 0.03 to 0.2 mg / m 3 The method for controlling pests is characterized by spraying the insect pests so as to achieve the above-mentioned results. Effect of the Invention

[0007] The fixed-quantity spray type pest control aerosol of the present invention uses only pyrethrin as the pest control ingredient, and by setting the amount of pyrethrin sprayed per spray operation to 1 to 5 mg, sufficient pest control effect can be obtained immediately after use, so that it is highly effective in pest control in modern airtight houses and is extremely useful. Furthermore, the fixed-dose pest control aerosol of the present invention is useful because it has a reduced unpleasant odor derived from pyrethrins, and therefore provides a good usability not only to the user but also to people in the treatment space. The pest control method of the present invention can provide a sufficient pest control effect as expected immediately after use by spraying a fixed-volume spray type pest control aerosol, and therefore can be a useful pest control method for users who are more safety-conscious. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The present invention will be described in detail below. <Fixed-volume spray aerosol for pest control> A fixed-dose aerosol for pest control is an aerosol that sprays a fixed amount of aerosol composition with one spray operation. A fixed-dose aerosol discharges a fixed amount of aerosol composition (aerosol concentrate and propellant) from a pressure-resistant aerosol container through the aerosol valve when a user operates a spray member (hereinafter also referred to as a spray button) attached to the aerosol valve, and the aerosol concentrate is sprayed as particulate spray particles by the propellant. The metered-dose aerosol of the present invention comprises an aerosol container filled with an aerosol composition comprising a pest control component consisting only of pyrethrins, an aerosol concentrate containing a solvent, and a propellant, a valve mechanism attached to the aerosol container, a stem mechanism attached to the valve mechanism, and a spray button which operates the stem mechanism and the valve mechanism and is formed with a nozzle for spraying the aerosol composition.

[0009] <Insect control ingredient> The constant-dose type pest control aerosol of the present invention uses only pyrethrin as the pest control ingredient. The pyrethrin in the present invention may be a commercially available product, which can be used as it is. The pyrethrin in the present invention means a mixture of six compounds, pyrethrin I and II, cinerin I and II, and jasmolin I and II, and the pyrethrin content means the total amount of the six compounds. In the present invention, the pyrethrin content in the aerosol concentrate is preferably 0.5% by weight / volume or more, more preferably 1% by weight / volume or more, and even more preferably 2% by weight / volume or more, and is preferably 20% by weight / volume or less, more preferably 17% by weight / volume or less, and even more preferably 5% by weight / volume or less.

[0010] <Solvent> The aerosol concentrate of the present invention contains pyrethrin, which is a pest control ingredient, and a solvent, and the solvent is the liquid carrier of the aerosol concentrate. The solvent in the present invention is not particularly limited as long as it is a solvent in which pyrethrin, a pest control ingredient, is appropriately dissolved and mixed with a propellant in an aerosol container to assist the diffusion of pyrethrin after spraying, and does not impair the effects of the present invention. However, it is not preferable to use water as a solvent because there is a possibility that the six types of compounds contained in pyrethrin, a pest control ingredient, may be hydrolyzed. As the solvent of the present invention, it is preferable to use an alcohol having 2 to 3 carbon atoms, that is, any one of ethanol, n-propanol, and isopropanol, or a combination of two or more of them. By using an alcohol having 2 to 3 carbon atoms as a solvent, pyrethrin, which is a pest control ingredient, can be stably dissolved and can be mixed with a propellant without problems. In the present invention, one or more solvent assistants selected from isopropyl myristate and normal paraffin, which improve the stability of the pyrethrin solution, are not necessarily required. The content of the solvent in the aerosol concentrate of the present invention is preferably 60% by weight / volume or more, more preferably 66% by weight / volume or more, and more preferably 80% by weight / volume or more, and is preferably 99% by weight / volume or less, more preferably 98% by weight / volume or less, and even more preferably 96% by weight / volume or less.

[0011] <Aerosol concentrate> The aerosol concentrate of the present invention may contain any component within the range that does not impair the effects of the present invention. Examples of the optional components include fragrance components, deodorant components, lubricants, etc. The aromatic component is a component that emits an aroma. Examples of the aromatic component include essential oil components and synthetic fragrances. These may be used alone or in combination of two or more. The aromatic component is preferably contained in the aerosol concentrate in an amount of 0.1% by weight / volume or less. The deodorant component is a component that can eliminate odors. Examples of the deodorant component include components that adsorb odorous components such as green tea extract, persimmon tannin, lauryl methacrylate, methyl benzoate, methyl phenylacetate, geranyl crotonate, benzyl acetate, benzyl propionate, and silver, and components that mask odorous components such as the above-mentioned aromatic components. In the present invention, the unpleasant odor derived from pyrethrin can be reduced by setting the ejection amount of pyrethrin, which is a pest control component, in a range of 1 to 5 mg per ejection operation, so that the deodorant component does not necessarily need to be contained in the aerosol concentrate. Examples of the lubricant include silicic acid anhydride, hydrophobic silica, calcium silicate, diatomaceous earth, high-purity silica, talc and other silicic acid compounds.

[0012] The content of the aerosol concentrate in the aerosol composition of the present invention can be appropriately changed depending on the content of pyrethrin in the aerosol concentrate and the compatibility with the propellant to be combined, and is not particularly limited, but the lower limit in the aerosol composition can be, for example, 1% by volume or more, preferably 2% by volume or more, more preferably 3% by volume or more, even more preferably 4% by volume or more, even more preferably 5% by volume or more, particularly preferably 7% by volume or more, and most preferably 10% by volume or more. Also, the upper limit in the aerosol composition can be, for example, 50% by volume or less, preferably 45% by volume or less, and more preferably 40% by volume or less. When the volume percent of the concentrate in the aerosol composition is equal to or greater than the above, a sufficient amount of pyrethrin can be sprayed in one spray operation, whereas when the volume percent is equal to or less than the above, the pyrethrin can be delivered over a wider area.

[0013] <Propellant> The propellant is a medium for spraying the above-mentioned aerosol concentrate, and is filled under pressure together with the aerosol concentrate into a pressure-resistant aerosol container. As the propellant, for example, one or more of liquefied petroleum gases (LPG) such as propane, propylene, n-butane, isobutane, etc., liquefied gases such as dimethyl ether (DME), compressed gases such as carbon dioxide gas, nitrogen gas, compressed air, etc., halogenated carbon gases such as HFC-152a, HFC-134a, HFO-1234yf, HFO-1234ze, etc. can be used. Among these, it is preferable to use liquefied petroleum gas from the viewpoint of compatibility with alcohols having 2 to 3 carbon atoms, which are suitable solvents in the present invention. The content of the propellant in the aerosol composition can be appropriately changed depending on the compatibility with the pyrethrin used and the aerosol concentrate to be combined, and is not particularly limited, but the lower limit in the aerosol composition can be, for example, 50% by volume or more, preferably 55% by volume or more, and more preferably 60% by volume or more. The upper limit of the content of the propellant in the aerosol composition can be, for example, 99% by volume or less, preferably 98% by volume or less, more preferably 97% by volume or less, even more preferably 96% by volume or less, even more preferably 95% by volume or less, particularly preferably 93% by volume or less, and most preferably 90% by volume or less. When the propellant is 50% by volume or more in the aerosol composition, the average particle size of the sprayed particles does not become too large, and the frequency of contact with pests increases, so that the desired control effect can be obtained. When the volume % or less is the above, the particle size of the sprayed particles does not become too small, and sufficient control effect can be obtained, and the unpleasant odor derived from pyrethrin is not easily felt. The volume ratio of the concentrate to the propellant in the aerosol composition can be, for example, 50:50 to 1:99, preferably 50:50 to 2:98, more preferably 50:50 to 3:97, even more preferably 50:50 to 4:96, still more preferably 50:50 to 5:95, particularly preferably 45:55 to 7:93, and most preferably 40:60 to 10:90.

[0014] <Amount of pyrethrin discharged per injection> The present invention is characterized in that the amount of pyrethrin discharged per one spraying operation is 1 to 5 mg. If the amount of pyrethrin discharged in one spray is less than 1 mg, sufficient pest control effect cannot be obtained immediately after use, and if the amount of pyrethrin discharged in one spray is more than 5 mg, the unpleasant odor caused by pyrethrin is not reduced, and a good usability cannot be obtained. In the present invention, the amount of pyrethrin ejected in one spray operation is preferably in the range of 1 to 4 mg, and more preferably in the range of 1 to 3 mg.

[0015] <Injection amount> The fixed-dose type pest control aerosol of the present invention preferably has a single spray amount of 0.1 mL or more, and more preferably has a single spray amount of 0.9 mL or less, more preferably has a single spray amount of 0.8 mL or less, and even more preferably has a single spray amount of 0.3 mL or less. If the amount of spraying per time is less than 0.1 mL, the sprayed aerosol composition is unlikely to be uniformly dispersed, and sufficient pest control effect may not be obtained immediately after use. By adjusting the amount of spraying per time to the range of 0.1 to 0.9 mL, the aerosol composition is uniformly dispersed in the treatment space, and sufficient pest control effect can be obtained immediately after use, which is preferable. The method of adjusting the amount of spraying per time is not particularly limited. The amount of spraying per time can be adjusted, for example, by appropriately adjusting the capacity of the housing (quantitative chamber) in the valve mechanism.

[0016] <Processing space> The treatment space in the present invention mainly refers to an indoor space. The volume of the treatment space is not particularly limited, but the floor area is preferably 1.5 m 2 Any space larger than this is acceptable, and in particular, a volume equivalent to a room of 1.5 to 24 tatami mats (roughly 5.8 to 93.3 m2) 3 It is preferable that the volume of the room is equivalent to a room of 3 to 12 tatami mats (roughly 11.7 to 46.7 m). 3 It is more preferable that the volume of the room is equivalent to a room size of 4.5 to 8 tatami mats (18.0 to 31.1 m). 3 It is even more preferable that If the doors (sliding doors) of the closets and cupboards in the treatment space are opened, they can be treated as spaces attached to the treatment space and pests can be controlled at the same time. Similarly, if the doors separating the bathroom and toilet from the adjacent spaces are opened, pests can be controlled in both spaces. The use of the fixed-dose type pest control aerosol of the present invention and the implementation of the pest control method are not particularly limited, but may be carried out, for example, when pests are found indoors, and sufficient pest control effects can be obtained immediately after use. The fixed-dose spray type pest control aerosol and pest control method of the present invention can be achieved by spraying toward an indoor space, for example, from a wall toward the center of a room.

[0017] <Pest control methods> The pest control method of the present invention comprises filling an aerosol concentrate containing pyrethrins as pest control ingredients and a solvent, and a propellant, into an aerosol container equipped with a metered-volume injection valve, and discharging a fixed-volume injection type pest control aerosol, the amount of pyrethrin discharged per injection being 1 to 5 mg, at a rate of 0.03 to 0.2 mg / m 3 This is a method of spraying so that the

[0018] <Pests> The pests in the present invention are not particularly limited as long as the effects of the present invention can be obtained. Specific examples of such pests include cockroaches such as the Smoky Brown Cockroach, German Cockroach, Yamato Cockroach, American Cockroach, and Brown Cockroach; crawling pests such as spiders, centipedes, ants, house centipedes, millipedes, pill bugs, woodlouse, termites, caterpillars, lice, ticks, and bedbugs; mosquitoes such as Culex pipiens, Aedes albopictus, Culex quinquefasciatus, and Aedes aegypti; midges, flies, fruit flies, flea flies, moth flies, and fungus flies; flying pests such as moths, bees, stink bugs, dermestid beetles, sand beetles, powderpost beetles, burrs moths, and wood moths; and indoor dust mites such as flour mites, Tyrophagus putrescentiae, house dust mites, house dust mites, dust mites, and Dermatophagoides pteronyssinus. Among other pests, the present invention is effective against flying pests, and is particularly suitable for mosquitoes, flies, and small flies.

[0019] <Fixed-volume aerosol valve> The constant-volume aerosol valve comprises an opening / closing member for switching between communication and cut-off between the inside and outside of a pressure-resistant aerosol container by the user operating the injection member, a housing (quantity chamber) to which the opening / closing member is attached, and a mounting member for holding the housing (quantity chamber) at a predetermined position in the pressure-resistant container. The opening / closing member also includes a stem that slides up and down in conjunction with the injection member. The sliding of the stem switches between communication (injection state) and cut-off (non-injection state) of the aerosol composition. The aerosol valve is formed with a housing hole for taking in the aerosol composition from the pressure-resistant aerosol container, and a stem hole for sending the taken-in aerosol composition to the injection member. The path from the housing hole to the stem hole constitutes an internal passage through which the aerosol composition passes.

[0020] <Injection member> The spray member (spray button) is a member attached to a pressure-resistant aerosol container via a constant-dose aerosol valve. The spray button is formed with a passage in the operating part through which the aerosol composition taken from the pressure-resistant aerosol container via the stem hole of the constant-dose aerosol valve passes, and with a nozzle through which the aerosol composition is sprayed. From the viewpoint of improving diffusibility, the inner diameter of the nozzle hole (nozzle hole diameter) is preferably φ0.1 to 3.0 mm, more preferably φ0.2 to 2.0 mm, and even more preferably φ0.5 to 1.5 mm. In the present invention, the number and shape of the nozzles are not limited.

[0021] <Injection power> In the present invention, the constant-dose spray type pest control aerosol is prepared by filling a pressure-resistant container for aerosol with the concentrate and the propellant, i.e., the aerosol composition, as described above, and spraying a constant amount of the aerosol composition by pressing the spray button once. The spray force of the aerosol composition at a position 20 cm away from the nozzle is preferably 1 to 30 gf, more preferably 2 to 20 gf, and even more preferably 3 to 10 gf. The spray force can be determined by measuring the maximum value when a fixed-dose aerosol, maintained at a constant temperature of 25°C, is sprayed once from a distance of 20 cm from the nozzle of the spray button toward the center of a circular flat plate with a diameter of φ60 mm attached to a digital force gauge (IMADA Co., Ltd., model number: DS2-2N).

[0022] <Average particle diameter (D50)> The fixed-dose type pest control aerosol of the present invention has an average particle size (D50) of spray particles at a distance of 15 cm from the nozzle at 25°C, preferably in the range of 5 to 40 μm, more preferably in the range of 7 to 30 μm, and even more preferably in the range of 10 to 20 μm. The mean particle diameter (D50) of the spray particles in the present invention means the volume mean particle diameter (D50) of the spray particles measured at a distance of 15 cm from the nozzle of a constant-dose aerosol, and can be measured using a known particle size distribution measuring device and an automatic calculation processing device. Specifically, a laser diffraction particle size analyzer (e.g., Microtrack Bell's "LDSA-1400A") is used as the particle size distribution analyzer, and the position of the aerosol is adjusted so that the distance between the laser beam irradiated from the laser light emitter to the light receiver and the nozzle of the constant-volume aerosol is 15 cm, and the spray particles pass perpendicularly through the laser beam. Measurements are performed while the constant-volume aerosol is being sprayed, and the particle size distribution of the spray particles is analyzed by an automatic calculation processor, and the 50% mean particle size (D50) of the spray particles is calculated based on the volume cumulative distribution. EXAMPLES

[0023] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples.

[0024] (1) Test specimen Isopropanol (IPA) was added to 3.13 g of pyrethrin and made up to 100 mL to prepare a stock aerosol solution. A pressure-resistant aerosol canister (outer diameter 35 mm x total length 84 mm) was filled with 6.7 mL of the above-mentioned aerosol concentrate and closed with a metered-dose valve (0.2 mL per spray). Then, 35 mL of liquefied petroleum gas (LPG: 0.49 MPa) was pressurized and filled as a propellant. A spray button (nozzle hole diameter: 0.6 mm) was attached to the metered-dose valve to obtain a metered-dose spray type pest control aerosol of Example 1 with a spray volume of 0.2 mL per spray operation and an ejection volume of 1 mg of pyrethrin. In addition, in Examples 2 and 3 and Comparative Examples 1 to 4, the constant-dose spray aerosols for pest control were prepared in the same manner as in Example 1 to obtain the constant-dose spray aerosols for pest control shown in Table 1 below. The aerosol of Comparative Example 4 was of a continuous spray type, and was sprayed for approximately 1 second so that the amount of pest control component ejected or released per operation was the same as that of the fixed-volume spray type pest control aerosol of Example 1.

[0025] [Table 1]

[0026] (2) Method for evaluating pest control effect (immediately after) Test room equivalent to 8 tatami mats (3.6m x 3.6m x height 2.4m ≒ 31.1m 3 One hundred adult female Culex pipiens mosquitoes were released into the room (room temperature 27±1℃, humidity 60-80%RH, ventilation conditions: no ventilation) as test insects. The constant-amount spray type pest control aerosols of Examples 1 to 3 and Comparative Examples 1 to 3 were sprayed once diagonally upward from a nozzle located at a height of about 1.5 m from the central floor of the test room. Similarly, the continuous spray type aerosol of Comparative Example 4 was sprayed for about 1 second. The number of test insects knocked down over time was visually counted up to 2 hours after spraying, and all test insects that were killed, knocked down, or active were collected from the test room 2 hours after spraying and observed. From the change in the number of test insects knocked down, the 50% knockdown time KT50 and the 90% knockdown time KT90 were calculated, and the knockdown rate was calculated from the following calculation formula (1). In addition, the collected test insects were left to stand for 24 hours at room temperature of 25°C, the number of dead test insects was counted visually, and the mortality rate after 24 hours was calculated using the following formula (2). [Calculation formula (1)] Knockdown rate (%) = (number of knocked down test insects (heads) / 100 (heads)) x 100 [Calculation formula (2)] Mortality rate after 24 hours (%) = (number of test insects confirmed to be dead after 24 hours (heads) / 100 (heads)) x 100

[0027] (3) Evaluation method for pest control effect (after 6 hours) In the same test room as in the above-mentioned "Method for evaluating pest control effect (immediately after)", the fixed-dose spray type pest control aerosols of Examples 1 to 3 and Comparative Examples 1 to 3, and the continuous spray type aerosol of Comparative Example 4 were sprayed once under the same conditions as in the above-mentioned "Method for evaluating pest control effect (immediately after)". Six hours after spraying, 100 adult female Culex pipiens mosquitoes were released into the test room as test insects. Two hours after the test insects were released, all dead, knocked down and active test insects were collected from the test room, and the KT50, KT90, knockdown rate (%) and mortality rate (%) were calculated in the same manner as in the "Evaluation method for pest control effect (immediately after)" above. The evaluation of the pest control effect "immediately after" and "6 hours later" was carried out twice each, and the average values ​​of KT50, KT90, knockdown rate (%), and mortality rate (%) are shown in Table 2 below.

[0028] [Table 2]

[0029] (4) Evaluation method for usability Test room equivalent to 8 tatami mats (3.6m x 3.6m x height 2.4m ≒ 31.1m 3The test room was maintained at room temperature of 27±1°C, humidity of 60-80% RH, and ventilation conditions: no ventilation. The fixed-dose pest control aerosols of Examples 1-3 and Comparative Examples 1-3, and the continuous spray aerosol of Comparative Example 4 were sprayed once diagonally upward from a nozzle located approximately 1.5 m above the central floor of the test room by expert panelists. Immediately after spraying, a sensory evaluation was conducted on the intensity of the odor derived from the pest control ingredients and the pleasantness or unpleasantness of the odor, according to the evaluation criteria below. This sensory evaluation was carried out by 12 expert panelists. In addition, if the odor intensity is "3" or less and the pleasantness / unpleasantness level is "-2" or more in the following evaluation criteria, there is no problem in practical use. [Evaluation Criteria] Odor Intensity 0: Odorless 1: A barely detectable odor 2: A weak odor that lets you know what it is 3: Easily detectable odors 4: Strong odor 5: Strong odor ·Pleasure / displeasure level 0: Neither pleasant nor unpleasant -1: Somewhat uncomfortable -2: Unpleasant -3: Very uncomfortable -4: Extremely uncomfortable

[0030] [Table 3]

[0031] The evaluation results shown in Tables 1 to 3 are summarized below. The fixed-dose pest control aerosols of Examples 1 to 3, which are specific examples of the present invention and have a pyrethrin ejection amount of 1 to 5 mg per operation, were confirmed to exhibit high pest control effects immediately after use, as is clear from the results of "Control effect (immediately after)" and "Control effect (6 hours later)" shown in Table 2. Furthermore, as shown in Table 3, it was confirmed that the metered-dose spray type pest control aerosol of Example 3, which is a specific example of the present invention, has an unpleasant odor derived from pyrethrins that is not problematic in terms of both intensity and unpleasantness in practical use. Similarly, it was confirmed that the metered-dose spray type pest control aerosols of Examples 1 and 2 have an unpleasant odor derived from pyrethrins that is not problematic in terms of both intensity and unpleasantness in practical use. These results show that the fixed-dose pest control aerosols of Examples 1 to 3, which are specific examples of the present invention, provide sufficient pest control effects immediately after use, and are therefore highly effective in pest control in modern airtight homes. After a certain period of time, the control effect quickly disappears, and the unpleasant odor caused by pyrethrins is also reduced, providing a good usability not only to the user but also to people in the treatment space. In contrast, the fixed-dose pest control aerosol of Comparative Example 1, in which the amount of pyrethrin ejected per operation was less than 1 mg, not only took a significantly longer time to knock down immediately after use than in Examples 1 to 3, as is clear from the results of "Control effect (immediately after)" in Table 2, but also failed to provide a sufficient lethal effect. In addition, as shown in Table 3, the fixed-dose type pest control aerosol of Comparative Example 2, in which the amount of pyrethrin discharged per operation exceeded 10 mg, had an unpleasant odor derived from pyrethrin at a level that was problematic in terms of both intensity and unpleasantness, and it was confirmed that a pleasant usability could not be obtained. On the other hand, the results of "Control effect (6 hours later)" shown in Table 2 for the pest control aerosol of Comparative Example 3, which used a pyrethroid compound other than pyrethrin as the active ingredient, and the pest control aerosol of Comparative Example 4, which used a continuous injection aerosol instead of the fixed-amount injection aerosol, revealed that there is a possibility that more pest control ingredients than necessary may remain in modern airtight homes even after a certain period of time has passed. The fixed-dose pest control aerosol of the present invention uses only pyrethrin as the pest control ingredient and ejects 1 to 5 mg of pyrethrin per ejection, and therefore exerts not only an excellent pest control effect immediately after use in modern airtight houses, but also an effect in which the control effect disappears quickly.Furthermore, the unpleasant odor caused by pyrethrin is reduced, providing a good usability experience for people in the treated space, thereby exerting the effects unique to the present invention.

Claims

1. The method comprises filling an aerosol concentrate containing a pest control component consisting only of pyrethrins and a solvent, and a propellant into an aerosol container equipped with a metered-dose injection valve; The amount of pyrethrin discharged per one injection is 1 to 5 mg. A fixed-dose aerosol for pest control.

2. 2. The constant-quantity spray type pest control aerosol according to claim 1, wherein the solvent is an alcohol having 2 to 3 carbon atoms.

3. The constant-quantity spray type pest control aerosol according to claim 1 or 2, wherein the amount sprayed per spray operation is 0.1 to 0.9 mL.

4. The aerosol concentrate containing pyrethrin, which is a pest control ingredient, and a solvent, and a propellant are filled in an aerosol container equipped with a metered-dose injection valve; A fixed-quantity spray type pest control aerosol having a pyrethrin discharge amount of 1 to 5 mg per spray operation, The amount of pyrethrin released is 0.03 to 0.2 mg / m ３ The injection is performed so as to Pest control methods.

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