Methods for controlling crawling insects

Abstract

To provide a highly versatile insect extermination device that can be safely used anywhere indoors and that does not require a large-scale device, thereby facilitating extermination treatment. [Solution] An aerosol product for exterminating crawling pests comprises an insecticidal active ingredient for exterminating crawling pests, a solvent in which the insecticidal active ingredient dissolves, a propellant for spraying the insecticidal active ingredient and the solvent, and an aerosol container for containing the insecticidal active ingredient, the solvent, and the propellant, wherein the weight ratio of the propellant contained in the aerosol container to the liquid other than the propellant is set to be within the range of 8:92 to 30:70 when calculated as liquid:propellant, and the aerosol container is of a fixed-amount spray type and is provided with a push-down operating button that fits into a discharge pipe on the aerosol container, and the operating button has a nozzle portion that communicates with the discharge pipe.

Description

Technical Field

[0001] The present invention relates to, for example, a method for controlling crawling pests, and particularly belongs to the technical field related to aerosols that exert efficacy against cockroaches hiding deep in indoor gaps.

Background Art

[0002] For example, cockroaches lurk in narrow indoor gaps, and may nest and breed on the back surfaces or undersurfaces of furniture, electrical appliances, and the like. As an apparatus for exterminating cockroaches hiding in such narrow places, for example, the sanitary pest repellent apparatus disclosed in Patent Document 1 is known. In Patent Document 1, a chemical diffusion base ring portion is provided at the lower part of furniture, electrical appliances, and the like, a space for diffusing the repellent chemical is defined and formed inside the chemical diffusion base ring portion, and the repellent chemical is injected into the space in the chemical diffusion base ring portion by an injection nozzle. An aerosol container containing the repellent chemical is connected to the injection nozzle via a connection tube, so that the repellent chemical in the aerosol container is injected from the injection nozzle into the space inside the chemical diffusion base ring portion through the connection tube.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] However, since the chemical diffusion base ring portion of the apparatus of Patent Document 1 is provided at the lower part of furniture, electrical appliances and the like, the repellent chemical cannot reach, for example, the back surface of the furniture. Therefore, in the case of the apparatus of Patent Document 1, it is considered that almost no efficacy is exerted on cockroaches lurking on the back surface of furniture.

[0005] Furthermore, since the drug diffusion base can only be installed when furniture is being set up, it is difficult to install the device described in Patent Document 1 after the furniture has been set up. In addition, the drug diffusion base must be manufactured to match the shape and size of the furniture, which also presents a problem of low versatility.

[0006] Furthermore, the apparatus described in Patent Document 1 is a large-scale device because, in addition to the drug diffusion base ring, it also requires a spray nozzle corresponding to the size of the drug diffusion base ring, and a connecting tube for connecting the aerosol container and the spray nozzle.

[0007] Furthermore, when spraying repellent agents in enclosed spaces such as indoors, it is preferable from a safety standpoint to keep the amount of repellent agent sprayed at one time below the specified amount.

[0008] This invention has been made in view of the above points, and its purpose is to provide a highly versatile product that can be used safely anywhere indoors, and moreover, to simplify pest control by eliminating the need for large-scale equipment. [Means for solving the problem]

[0009] To achieve the above objective, the present invention increases the proportion of propellant contained in the aerosol container, lowers the vapor pressure of the solvent that dissolves the insecticidal active ingredient, and slows the evaporation rate of the solvent that forms the particles sprayed from the aerosol container, thereby allowing the particles to spread over a wide area.

[0010] The first invention is, It contains an insecticidal active ingredient that exterminates cockroaches, A solvent in which the above insecticidal active ingredient dissolves, The above-mentioned insecticidal active ingredient and the above-mentioned solvent are provided as propellants for spraying, In an aerosol product for cockroach control comprising the above-mentioned insecticidal active ingredient, the above-mentioned solvent, and an aerosol container containing the above-mentioned propellant, The vapor pressure of the above solvent at 25°C is said to be 7.0 kPa or less. The weight ratio of the propellant contained in the above aerosol container to the liquid other than the propellant is set to be within the range of 8:92 to 30:70 when the ratio of liquid to propellant is expressed as follows: The above-mentioned aerosol container has a nozzle and is a quantitative spray type that sprays a predetermined amount of the above-mentioned insecticidal active ingredient and the above-mentioned solvent from the nozzle into the gap between the wall and furniture in the room or the gap between the wall and electrical appliances in the room with a single operation of the spray button.

[0011] This configuration results in a propellant-rich formulation, as the weight ratio of liquid to propellant is within the range of 8:92 to 30:70. This makes it easier for the liquid containing the insecticidal active ingredient and solvent to form small particles when sprayed from the aerosol container, increasing the force of the particles, allowing them to travel over a wide area and remain suspended in the air for longer periods. Furthermore, the solvent's vapor pressure at 25°C is 7.0 kPa or less, which is sufficiently low. This slows down the evaporation rate of the solvent forming the sprayed particles, allowing them to travel further and remain suspended in the air for longer. For example, if sprayed between a wall and furniture, the insecticidal particles would travel along the side of the furniture to the back, then wrap around to the back of the furniture, travel along the back, remain suspended in the air, and then fall to the bottom of the furniture due to their own weight. In this way, even in narrow gaps, the particles travel over a wide area, allowing the insecticidal active ingredient to exert its effect over a wide area without the need for large-scale equipment.

[0012] Furthermore, because the aerosol container is a metered-dispense type, even if the particles are dispersed over a wide area as described above, the amount of insecticidal active ingredient will not exceed the prescribed amount, thus increasing safety and ease of handling. In addition, since the application area is not limited to under furniture, as with conventional products, its versatility is increased.

[0013] The second invention is, in the first invention, The above insecticidal active ingredient is characterized by being at least one of cyphenothrin, cyfluthrin, and tralomethrin.

[0014] According to this configuration, high efficacy against crawling pests can be obtained even with a small amount of the insecticidal active ingredient.

[0015] A third invention is, in the first or second invention, characterized in that the injection amount of the insecticidal active ingredient by one operation of the injection button is set to 3 mg or more and 20 mg or less.

[0016] According to this configuration, since 3 mg or more of the insecticidal active ingredient is injected by one injection operation, the insecticidal active ingredient contained in each particle is sufficiently ensured and high efficacy is obtained even when the particles fly over a wide range. On the other hand, since the amount of the insecticidal active ingredient injected by one injection operation is 20 mg or less, high safety is ensured when used, for example, in a closed room.

[0017] A fourth invention is, in any one of the first to third inventions, characterized in that the solvent is at least one of isopropyl myristate and a saturated hydrocarbon solvent.

[0018] That is, ethanol (vapor pressure 7.91 kPa at 25°C) is a commonly used solvent, but by using isopropyl myristate and a saturated hydrocarbon solvent, the vapor pressure of the solvent becomes lower than that of ethanol. This further slows down the evaporation rate of the solvent forming the injected particles, and further extends the time during which the particles drift in the air.

[0019] A fifth invention is, in any one of the first to fourth inventions, characterized in that the injection amount of the liquid other than the propellant by one operation of the injection button is set to 0.1 ml or more and 0.4 ml or less.

[0020] A sixth invention relates to an insecticidal active ingredient for exterminating cockroaches, a solvent in which the insecticidal active ingredient dissolves and which has a vapor pressure of 7.0 kPa or less at 25°C, lower than that of ethanol, The above insecticidal active ingredient, the above solvent, and a propellant for spraying the above insecticidal active ingredient and the above solvent are housed in a metered-dose aerosol container that sprays a predetermined amount of the above insecticidal active ingredient and the above solvent by a single operation of a spray button, and the weight ratio between the above propellant and the liquid other than the propellant is set to fall within the range of 8:92 to 30:70 when expressed as liquid:propellant, A method for controlling crawling pests, which comprises spraying a predetermined amount of the above insecticidal active ingredient and the above solvent upward from the nozzle portion of the above aerosol container into the gap between an indoor wall and furniture or the gap between an indoor wall and an electrical appliance.

Effects of the Invention

[0021] According to the first and sixth inventions, the ratio of the aerosol propellant is increased, and the vapor pressure of the solvent dissolving the insecticidal active ingredient is lowered to slow the evaporation rate of the solvent forming the sprayed particles, so that the particles can be spread over a wide range, and the efficacy of the insecticidal active ingredient can be exerted over a wide range without providing a large-scale apparatus. In addition, since the aerosol container is of the metered spray type, the amount of the insecticidal active ingredient will not be sprayed beyond the specified amount. Therefore, it can be used safely anywhere in a room with high versatility, and the control treatment can be facilitated without requiring a large-scale apparatus.

[0022] According to the second invention, since the insecticidal active ingredient is at least one of phenothrin, cyfluthrin, and tralomethrin, high efficacy against crawling pests can be obtained even with a small amount of the insecticidal active ingredient, and the spray amount by a single operation of the spray button can be reduced.

[0023] According to the third invention, since the spray amount of the insecticidal active ingredient by a single operation of the spray button is 3 mg or more and 20 mg or less, high safety can be ensured while obtaining high efficacy from the insecticidal active ingredient.

[0024] According to the fourth invention, since the solvent is at least one of isopropyl myristate and a saturated hydrocarbon solvent, the time during which the particles sprayed from the aerosol container drift in the air can be further extended, and the efficacy of the insecticidal active ingredient is further enhanced.

[0025] According to the fifth invention, it can be used safely anywhere indoors, making it highly versatile, and moreover, it eliminates the need for large-scale equipment, making pest control easier. [Brief explanation of the drawing]

[0026] [Figure 1] This is a perspective view of an aerosol product for controlling crawling insects. [Figure 2] This is a schematic diagram illustrating the test environment in a laboratory. [Modes for carrying out the invention]

[0027] Embodiments of the present invention will be described in detail below with reference to the drawings. The following description of preferred embodiments is essentially illustrative and is not intended to limit the present invention, its applications, or its uses.

[0028] Figure 1 is a perspective view of an aerosol product 1 for controlling crawling insects according to an embodiment of the present invention. The aerosol product 1 for controlling crawling insects comprises an aerosol container 10, a push-down operation button (spray button) 20, a cylindrical base 30 attached to the aerosol container 10, and a cylindrical cover 40 attached to the cylindrical base 30. The operation button 20 and the cylindrical cover 40 are configured to be switchable between a pressable state in which the operation button 20 can be pressed down and a non-pressable state in which the operation button 20 cannot be pressed down by rotating them.

[0029] In this description of the embodiment, when the user holds and uses the device in their hand, the left and right sides from the user's perspective will be simply referred to as "left" and "right," respectively. The side that is closer to the user will be simply referred to as "back," and the side that is further away from the user will be simply referred to as "front."

[0030] The peripheral wall of the aerosol container 10 is translucent, allowing the remaining amount of contents to be seen from the outside. A quantitative spray valve mechanism (not shown) is provided at the top of the aerosol container 10. This valve mechanism includes a discharge pipe (not shown) that moves vertically and dispenses the contents contained in the aerosol container 10, a biasing member (not shown) consisting of a spring or the like that biases the discharge pipe upward, and a valve body (not shown). The discharge pipe is positioned to extend vertically, and when it is in the raised position, the valve body closes the lower end (upstream end) of the discharge pipe, preventing communication between the inside of the aerosol container 10 and the discharge pipe. However, when the discharge pipe is pushed downward from the raised position, the lower end of the discharge pipe opens, allowing communication between the inside of the aerosol container 10 and the discharge pipe, and the contents are dispensed from the upper end of the discharge pipe. The valve mechanism is configured in this manner. Furthermore, when the discharge pipe is pushed once, the lower end of the discharge pipe opens momentarily and then closes, and a small amount (a predetermined amount) of the contents is sprayed. In other words, this aerosol container 10 is a metered-discharge type. For example, the container described in Japanese Patent Publication No. 2014-28631 can be used as the metered-discharge type aerosol container 10.

[0031] The operating button 20 can be obtained, for example, by injection molding of a resin material, and the entire unit is integrally molded. The operating button 20 is fitted onto the upper side of the discharge tube of the aerosol container 10 and is used to push the discharge tube, and has a button body 21 and a nozzle portion 23. The nozzle portion 23 protrudes from the front of the button body 21.

[0032] The nozzle portion 23 protrudes forward in a direction intersecting the centerline of the discharge pipe, and is inclined so that it is positioned higher towards the front. The base end of the nozzle portion 23 communicates with the discharge pipe 13 of the aerosol container 10. The inclination angle of the nozzle portion 23 can be set, for example, within a range of 5 degrees to 45 degrees, where the angle between the centerline of the discharge pipe and a plane perpendicular to it is between 5 degrees and 45 degrees. By inclining the nozzle portion 23, it becomes possible to effectively discharge the contents diagonally upward.

[0033] The cylindrical base 30 extends vertically and is formed in a cylindrical shape with an outer diameter approximately the same as the outer diameter of the upper and lower middle portion of the aerosol container 10. The lower end of the cylindrical base 30 is completely open, and the upper part of the aerosol container 10 is inserted and fixed into the lower end of the cylindrical base 30.

[0034] The cylindrical cover 40 is formed to surround the operation button 20 and is attached to the cylindrical base 30. That is, the lower side of the cylindrical cover 40 fits onto the upper side of the cylindrical base 30. In this state, the outer surface of the button body 21 of the operation button 20 is covered by the cylindrical cover 40. In addition, the nozzle portion 23 of the operation button 20 protrudes forward from a notch 41 provided at the front of the cylindrical cover 40.

[0035] The contents contained in the aerosol container 10 are an insecticidal active ingredient for exterminating crawling insects, a solvent in which the insecticidal active ingredient dissolves, and a propellant for spraying the insecticidal active ingredient and solvent. The contents may also contain other chemicals, etc., besides the insecticidal active ingredient, solvent, and propellant. For example, insect repellents, fragrances, fungicides, disinfectants, etc., can be mixed into the contents. The type of insect repellent is not particularly limited, but it should be one that has an effect of repelling crawling insects.

[0036] The insecticidal active ingredient is an ingredient that exhibits insecticidal effects against crawling insects, and various pesticides used as insecticides can be used. In this embodiment, synthetic pyrethroids can be used, specifically at least one of cyphenothrin, cyfluthrin, and tralomethrin, and these may be used in mixture form. By using at least one of cyphenothrin, cyfluthrin, and tralomethrin, sufficient efficacy can be obtained even with a smaller amount of insecticidal active ingredient sprayed compared to cases where, for example, imiprothrin, phthalthrin, or resmethrin are used.

[0037] The solvent is preferably one in which the above-mentioned insecticidal active ingredient dissolves and has a vapor pressure lower than that of ethanol. The vapor pressure of the solvent is preferably 7.0 kPa or less at 25°C, more preferably 4.5 kPa or less at 25°C, and even more preferably 1.9 kPa or less. A solvent with a vapor pressure of 0.7 kPa or less at 25°C is most preferred. As such a solvent, for example, at least one of isopropyl myristate and a saturated hydrocarbon solvent can be used, and these may be used in mixture form.

[0038] Examples of the above solvents include propanol (vapor pressure at 25°C: 4.41 kPa), water (3.2630 kPa), octane (1.8874 kPa), and nonane (6.177 × 10⁻¹⁰). 2 Pa), dodecane (same 1.80 × 10 Pa), tridecane (same 7.5 Pa), isopropyl myristate (1.247 × 10 -2 Examples include Pa, but are not limited to these; various solvents within the above vapor pressure range can be used. One solvent may be used alone, or multiple solvents may be used in mixture form.

[0039] If the vapor pressure of the solvent at 25°C exceeds 7.0 kPa, the evaporation rate of the solvent forming the sprayed particles increases rapidly, causing the mass of each particle to decrease quickly. This shortens the distance the particles travel and the time they remain suspended in the air. This results in a decrease in effectiveness. On the other hand, if the vapor pressure of the solvent at 25°C is 7.0 kPa or less, the vapor pressure is sufficiently low, so the evaporation rate of the solvent forming the sprayed particles slows down. This allows the particles to travel further and remain suspended in the air for a longer time. In particular, a vapor pressure of 1.9 kPa or less at 25°C is preferable because it significantly increases both the distance the particles travel and the time they remain suspended in the air.

[0040] The propellant can be liquefied petroleum gas (LPG), dimethyl ether (DME), or the like, and these may be used in mixtures.

[0041] As described above, the aerosol container 10 contains a propellant and a liquid other than the propellant. The weight ratio of the propellant to the liquid other than the propellant is set to be within the range of 8:92 to 30:70 when the liquid:propellant ratio is set, and this crawling insect control aerosol product 1 has a propellant-rich formulation. As a result, when the liquid containing the insecticidal active ingredient and solvent is sprayed from the aerosol container 10, it tends to become small particles, the particles have a strong force, and the sprayed particles are dispersed over a wide area and easily float in the air.

[0042] In other words, if the amount of propellant is less than the weight ratio of the liquid to propellant which is 30:70, when the liquid containing the insecticidal active ingredient and solvent is sprayed from the aerosol container 10, the particles become larger, resulting in a heavier weight per particle, making it difficult for them to float in the air and causing them to fall before they can spread over a wide area. Also, if the amount of propellant is less than the weight ratio of the liquid to propellant which is 30:70, in other words, the amount of liquid is larger. If the amount of liquid is greater than the weight ratio, too much liquid is sprayed in one go, which also makes the weight per particle heavier and makes it difficult for them to float in the air. On the other hand, if the amount of propellant is more than the weight ratio of the liquid to propellant which is 8:92, too little liquid is sprayed in one go, preventing the particles from spreading densely over a wide area, thus reducing the effectiveness of the insecticidal active ingredient. Therefore, assuming a propellant-rich formulation, it is preferable to set the weight ratio of the liquid to propellant within the range of 8:92 to 30:70. More preferable is a weight ratio of 10:90 to 20:80, and even more preferable is a range of 15:85 to 17:83.

[0043] The amount of insecticidal active ingredient sprayed with a single operation of the operation button 20 (hereinafter also referred to as the Ai amount) is set to 3 mg or more and 20 mg or less. The Ai amount can be set to the above range by changing the amount of insecticidal active ingredient contained and the amount of liquid sprayed with a single operation of the operation button 20. If the Ai amount is less than 3 mg, too little insecticidal active ingredient will be sprayed into the space, reducing the effectiveness of the insecticidal active ingredient. On the other hand, if the Ai amount is more than 20 mg, too much insecticidal active ingredient will be sprayed into the space, which may be undesirable from a safety standpoint, especially in confined spaces.

[0044] Furthermore, the amount of liquid (insecticidal active ingredient and solvent) sprayed with a single operation of the operation button 20 is set to be between 0.1 ml and 0.4 ml. The amount of liquid sprayed with a single operation of the operation button 20 can be set to this range by modifying the structure of the valve mechanism, etc. If the amount of liquid sprayed with a single operation of the operation button 20 is less than 0.1 ml, the amount of insecticidal active ingredient sprayed into the space will be too small, reducing the effectiveness of the insecticidal active ingredient. On the other hand, if the amount of liquid sprayed with a single operation of the operation button 20 is more than 0.4 ml, the amount of insecticidal active ingredient sprayed into the space will be too large, which may be undesirable from a safety standpoint, especially in confined spaces.

[0045] Next, we will describe how to use the crawling insect control aerosol product 1 configured as described above. The crawling insect control aerosol product 1 may be sprayed throughout the room, but it is preferable to spray it into gaps in the room where crawling insects are likely to be hiding. That is, for example, point the nozzle 23 of the crawling insect control aerosol product 1 towards narrow gaps between the wall and furniture, or between the wall and electrical appliances, and then operate the operation button 20. It is preferable to operate the operation button 20 only once, but it may be operated multiple times if the room is large.

[0046] As a result, the pressure of the propellant contained in the aerosol container 10 causes the insecticidal active ingredient and solvent to be sprayed from the nozzle 23 together with the propellant. At this time, as described above, the weight ratio is set and the propellant is a rich formulation, so when the liquid containing the insecticidal active ingredient and solvent is sprayed from the aerosol container 10, it tends to become small particles, the force of the particles is strong, and the sprayed particles are dispersed over a wide area and easily float in the air. Furthermore, because the vapor pressure of the solvent is low, the evaporation rate of the solvent forming the sprayed particles is slow, which causes the particles to travel far and float in the air for a longer time. Therefore, the particles containing the insecticidal active ingredient fly along the sides of furniture and electrical appliances to the back, then wrap around to the back of them and fly along the back, floating in the air, and then fall to the bottom due to their own weight. In this way, even in narrow gaps, the particles are dispersed over a wide area, so the effectiveness of the insecticidal active ingredient can be exerted over a wide area without the need for large-scale equipment.

[0047] The height of the nozzle section 23 during spraying should preferably be about 100 cm from the floor. If the nozzle section 23 is too low, the amount of particle diffusion upward will decrease, making it difficult for the particles to wrap around to the back side.

[0048] Furthermore, because the aerosol container 10 is a metered-dispense type, even if particles are dispersed over a wide area as described above, the amount of insecticidal active ingredient will not exceed the prescribed amount, thus increasing safety and ease of handling. In addition, since the application area is not limited to under furniture, as in conventional products, its versatility is increased.

[0049] Next, we will describe the results of the efficacy test for the crawling insect control aerosol product 1. The efficacy test was conducted in a peat chamber 100 as shown in Figure 2. The peat chamber 100 is a cube with sides of 180 cm and a volume of 5.82 m³. 3In the peat chamber 100, three pieces of furniture 102, 102, and 102 are recreated using multiple cardboard boxes 101. The dimensions of each piece of furniture 102 are 52 cm deep, 160 cm high, and 52 cm wide. The gap between adjacent pieces of furniture 102 is set to 5 cm. The gap between the side of the piece of furniture 102 located on the left in Figure 2 and the wall of the peat chamber 100 is set to 5 cm, and the gap between the back of the piece of furniture 102 and the wall of the peat chamber 100 is also set to 5 cm. Note that although furniture is assumed in Figure 2, it is not limited to furniture, and electrical appliances (for example, refrigerators or washing machines) may also be used.

[0050] The nozzle 23 of the crawling insect control aerosol product 1 is directed towards the gap between the side of the furniture 102, located on the left in Figure 2, and the wall of the peat chamber 100. The height of the nozzle 23 from the floor is set to 100 cm.

[0051] The first mesh bag 104 is placed 50 cm away from the tip of the nozzle 23 towards the back of the gap, and this first mesh bag 104 is attached to the wall of the peat chamber 100. Similarly, the second mesh bag 105 is placed 100 cm away from the tip of the nozzle 23 towards the back of the gap (on the back side of the furniture 102), the third mesh bag 106 is placed 150 cm away from the tip of the nozzle 23 towards the back of the gap, the fourth mesh bag 107 is placed 200 cm away from the tip of the nozzle 23 towards the back of the gap, and the fifth mesh bag 108 is placed 250 cm away from the tip of the nozzle 23 towards the back of the gap. The heights of the first to fifth mesh bags 104 to 108 decrease as they move away from the tip of the nozzle 23, and the fifth mesh bag 108 is placed near the floor surface of the peat chamber 100.

[0052] Each of the mesh bags 104-108 (numbers 1-5) contains 10 adult female cockroaches as test insects. Mesh bags 104-108 (numbers 1-5) are designed to allow for easy air circulation.

[0053] Next, operate the operation button 23. The amount of liquid other than the propellant sprayed with a single operation of the operation button 20 is set to 0.2 ml.

[0054] After spraying, the samples were left for 5 minutes. After 5 minutes, mesh bags 104-108 (numbers 1-5) were collected and the test insects were removed. The removed test insects were transferred to a clean container and given sugar water. The mortality rate was calculated 48 hours after transferring to the container.

[0055] [Table 1]

[0056] Examples 1-10 and Comparative Examples 1-10 of the present invention each have the following settings: amount of Ai, type of solvent, type of propellant, and liquid-gas ratio, as shown in Table 1. The solvent "IPM" is isopropyl myristate, and "Neothio" is neothiosol (manufactured by Chuo Kasei Co., Ltd.) as a saturated hydrocarbon solvent. The "liquid-gas ratio" is the weight ratio of the above liquid to propellant. The mortality rate (%) after 48 hours was calculated as (number of dead insects / total number of insects) × 100. "50cm", "100cm", "150cm", "200cm", and "250cm" are distances from the tip of the nozzle part 23 and indicate the locations where the 1st to 5th mesh bags 104 to 108 are placed. In other words, the fatality rate at "50cm" is the fatality rate of the test insects contained in the first mesh bag 104, the fatality rate at "100cm" is the fatality rate of the test insects contained in the second mesh bag 105, the fatality rate at "150cm" is the fatality rate of the test insects contained in the third mesh bag 106, the fatality rate at "200cm" is the fatality rate of the test insects contained in the fourth mesh bag 107, and the fatality rate at "250cm" is the fatality rate of the test insects contained in the fifth mesh bag 108. Note that "-" indicates where a fatality rate was not obtained.

[0057] In Examples 1 to 10, the weight ratio of the liquid to propellant was within the range of 8:92 to 30:70, and the vapor pressure of the solvent at 25°C was 7.0 kPa or less, which is lower than that of ethanol. As a result, a lethality of 80% or more was achieved even at a distance of 250 cm from the tip of the nozzle 23.

[0058] On the other hand, Comparative Example 1 differs from Example 1 only in the weight ratio of the liquid to the propellant, which is set to 6:94. In Comparative Example 1, the lethality rate at a distance of 250 cm from the tip of the nozzle 23 is only 30%. This is because there is too much propellant, resulting in too little liquid being sprayed in one go, preventing the particles from being dispersed densely over a wide area, and significantly reducing the effectiveness of the insecticidal active ingredient.

[0059] In Comparative Examples 2 and 3, the solvent was ethanol. However, in Comparative Example 2, the lethality rate at a distance of 250 cm from the tip of the nozzle 23 was only 60%, and in Comparative Example 3, the lethality rate at a distance of 250 cm from the tip of the nozzle 23 was only 50%. This is because the high vapor pressure of ethanol caused the sprayed particles to evaporate before they could travel far, thus shortening the distance the particles traveled.

[0060] In Comparative Example 4, the solvent is ethanol, and the weight ratio of the above liquid to propellant is set to 50:50. In Comparative Example 4, the lethality at a distance of 250 cm from the tip of the nozzle 23 is only 20%. This is because, due to the vapor pressure of ethanol mentioned above, and because the propellant is not rich, the above liquid does not easily become small particles when sprayed from the aerosol container 10, and the sprayed particles do not easily spread over a wide area.

[0061] In Comparative Example 5, the weight ratio of the liquid to the propellant was set to 50:50. In Comparative Example 5, the lethality rate at a distance of 250 cm from the tip of the nozzle 23 was only 20%. This is because, since the propellant was not rich, the liquid was less likely to be sprayed from the aerosol container 10 into small particles, and the sprayed particles were less likely to spread over a wide area. Similarly, the lethality rate was also worse in Comparative Example 6.

[0062] In Comparative Examples 7-9, since the solvent is ethanol, changing the weight ratio of the above liquid to propellant will worsen the lethality rate.

[0063] In Comparative Example 10, the weight ratio of the liquid to propellant is set to 40:60, but because the amount of propellant is small, the particles are less likely to be ejected, resulting in a lower lethality rate.

[0064] As described above, by reducing the solvent vapor and setting the liquid:propellant weight ratio to be within the range of 8:92 to 30:70, sufficient extermination effect can be obtained against crawling insects hiding deep in crevices. Although the above efficacy test was conducted only on Oriental cockroaches, as is clear from Examples 1 to 10, the insecticidal active ingredient adheres not only to Oriental cockroaches at the front of the crevices but also to those deep inside, so sufficient extermination effect can be obtained against crawling insects other than Oriental cockroaches, such as American cockroaches, German cockroaches, centipedes, etc.

[0065] The embodiments described above are merely illustrative in all respects and should not be interpreted restrictively. Furthermore, any modifications or changes that fall within the equivalent scope of the claims are all within the scope of the present invention. [Industrial applicability]

[0066] As described above, the aerosol product and method for controlling crawling insects according to the present invention can be used, for example, to control crawling insects such as cockroaches indoors. [Explanation of Symbols]

[0067] 1. Aerosol products for controlling crawling insects. 10 Aerosol containers 20 Operation buttons (spray button)

Claims

[Claim 1] Insecticidal active ingredients that eliminate creeping insects, A solvent in which the above insecticidal active ingredient dissolves, The above-mentioned insecticidal active ingredient and the above-mentioned solvent are provided as propellants for spraying, In a method for controlling crawling insects using an aerosol product for controlling crawling insects comprising the above-mentioned insecticidal active ingredient, the above-mentioned solvent, and an aerosol container containing the above-mentioned propellant, The weight ratio of the propellant contained in the aerosol container to the liquid other than the propellant is set to be within the range of 8:92 to 30:70 when the ratio of liquid to propellant is expressed as follows: The above aerosol container is a quantitative spray type that dispenses a predetermined amount of the above insecticidal active ingredient and the above solvent with a single operation of the spray button. The above-mentioned spray button is a push-down type operating button that fits onto the upper part of the discharge pipe of the aerosol container. The above operation button has a nozzle portion that communicates with the above discharge pipe, A method for controlling crawling insects, characterized in that the above-mentioned insecticidal active ingredient and solvent are sprayed from the nozzle along the side of furniture or electrical appliances by operating the above-mentioned operation button.

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