HK1237592A1 - Water-based insecticidal composition to be vaporized and diffused by being heated, and method for vaporizing and diffusing said composition by heating - Google Patents

Description

Aqueous insecticide composition for heat transpiration and method for heat transpiration of aqueous insecticide composition for heat transpiration

Technical Field

The present invention relates to an aqueous heat-radiating insecticide composition for controlling mosquitoes with reduced sensitivity (sensitivity) to pyrethroid (pyrethroid) type insecticidal components, and a heat radiating method using the aqueous heat-radiating insecticide composition.

Background

As a flying insect pest control product for controlling flying insect pests such as mosquitoes, so-called "mosquito incense liquid" has been commercially available, which is a system in which a liquid absorbent core is immersed in a chemical liquid containing an insecticidal component, the absorbed chemical liquid is guided to the upper portion of the liquid absorbent core, and the liquid absorbent core is heated to evaporate the insecticidal component into the atmosphere. Pyrethroid insecticide components are generally used as insecticide components of the mosquito repellent liquid. Although prallethrin, prallethrin furamethrin and the like have been the mainstream as pyrethroid-based insecticidal components, new components such as transfluthrin, metofluthrin, proffluthrin and the like having excellent insecticidal activity tend to be used in recent years.

In addition, there are oil formulations using kerosene as a base (base) and aqueous formulations using water as a base for the drug solution used for mosquito-repellent incense solutions. Although oil formulations are the mainstream of mosquito-repellent incense liquid in the world, aqueous formulations are used more favorably than oil formulations, and thus the demand for aqueous formulations is expected to increase in the future.

For example, patent documents 1 and 2 describe that aqueous formulations have advantages over oil formulations in that the risk of smoke and smoke can be reduced and the pesticidal effect on pests can be enhanced. Further, in these prior art documents, as the evaporative surfactant, there are included polyoxyalkylene alkyl ethers (polyoxyalkylenealkyl ether), polyoxyalkylene phenyl ethers (polyoxyalkylenephenyl ether), polyoxyethylene fatty acid esters (polyoxyethylenefatty acid ester), polyhydric alcohol fatty acid partial esters (polyhydric alcohol fatty acid partial ester), polyoxyethylene polyhydric alcohol fatty acid partial esters (polyoxyethylenefatty acid partial ester), fatty acid alkylolamides (fatty acid alkylolamide), and the like, which are related to many aspects, and there are disclosed an insecticidal efficacy-enhancing effect of a pyrethroid-based insecticidal component by the surfactant.

However, recently, insect pests such as mosquitoes with reduced sensitivity to pyrethroid-based insecticidal components have appeared in various parts of the world, and countermeasures against such pests have become urgent. The reduction in sensitivity is caused by activation of metabolic enzymes of pests, and it is said that the incorporation of piperonyl butoxide (piperonyl butoxide) is effective, but a useful compound in place of piperonyl butoxide has not been proposed. In patent documents 1 and 2, the test of the insecticidal efficacy is also directed to pests whose sensitivity is not reduced.

[ Prior art documents ]

[ patent document ]

[ patent document 1 ]: japanese examined patent publication No. 7-74130

[ patent document 2 ]: japanese examined patent publication No. 7-100641

Disclosure of Invention

Problems to be solved by the invention

In view of the current situation that mosquito-repellent incense liquid has been widely used as means for controlling mosquitoes in homes, the present inventors have conducted further studies while newly evaluating the techniques employed in the conventional flying insect pest control products, and as a result, have found that: among various surfactants, glycol ether compounds having a boiling point of 150 to 300 ℃ are particularly effective for mosquitoes having reduced sensitivity to pyrethroid-based insecticidal components, and the effect can be utilized as a sensitivity-reducing treatment aid, thereby completing the present invention.

That is, an object of the present invention is to provide an aqueous heat-transpiration insecticide composition useful as a sensitivity-reducing treatment aid containing a pyrethroid insecticide component and a pyrethroid insecticide component, and a heat-transpiration method using the aqueous heat-transpiration insecticide composition, for effectively controlling mosquitoes having reduced sensitivity to the pyrethroid insecticide component.

Means for solving the problems

In order to achieve the above object, the present invention employs the following configuration:

(1) an aqueous heat-transpiration insecticide composition for controlling mosquitoes having a reduced sensitivity to pyrethroid-based insecticidal components, comprising: 0.1 to 3.0 mass% of a pyrethroid insecticide component, 10 to 70 mass% of at least one glycol ether compound having a boiling point of 150 to 300 ℃ as a sensitivity-reducing treatment auxiliary for the pyrethroid insecticide component, and water.

(2) The aqueous pesticidal composition for heat transpiration according to the item (1), wherein the boiling point of the glycol ether compound is 200 to 260 ℃.

(3) The aqueous pesticidal composition for thermal transpiration according to the item (1) or (2), wherein the glycol ether compound is diethylene glycol monoalkyl ether.

(4) The aqueous pesticidal composition for thermal transpiration according to the item (3), wherein the diethylene glycol monoalkyl ether is diethylene glycol monobutyl ether.

(5) The aqueous pesticidal composition for thermal transpiration according to any one of (1) to (4), wherein the pyrethroid type insecticidal component is at least one selected from transfluthrin, metofluthrin and proffluthrin.

(6) The aqueous pesticidal composition for heat transpiration according to the item (5), wherein the pyrethroid type insecticidal component is transfluthrin.

(7) A method for heat-transpiring an aqueous pesticidal composition for heat-transpiration, comprising immersing a part of a wick in the aqueous pesticidal composition for heat-transpiration described in any one of (1) to (6), guiding the absorbed aqueous pesticidal composition for heat-transpiration to the upper part of the wick, and heat-transpiring the composition at 60 to 130 ℃.

(8) The method for thermal transpiration of an aqueous pesticidal composition for thermal transpiration according to (7), wherein the raw material of the wick is a polyester (polyester) fiber and/or a polyamide (polyamide) fiber, or a porous ceramic (porous ceramic).

Effects of the invention

The aqueous insecticide composition for heat transpiration of the present invention contains a pyrethroid type insecticidal component and a sensitivity-reducing treatment auxiliary for the pyrethroid type insecticidal component, and can effectively control mosquitoes having reduced sensitivity to the pyrethroid type insecticidal component, and therefore, is extremely useful. Further, a heat-transpiration method using the water-based insecticide composition for heat-transpiration is also very useful.

Detailed Description

The following describes an aqueous insecticidal composition for heat transpiration of the present invention and a method of heat transpiration using the aqueous insecticidal composition for heat transpiration. However, the present invention is not intended to be limited to the embodiments and examples described below.

The aqueous insecticide composition for heat transpiration contains 0.1 to 3.0 mass% of a pyrethroid-based insecticidal component. When the content of the pyrethroid insecticide component is less than 0.1% by mass, the insecticidal efficacy may decrease. On the other hand, if the content of the pyrethroid insecticide component exceeds 3.0 mass%, the properties of the aqueous composition may be impaired. Examples of the pyrethroid-based insecticidal component include: transfluthrin, metofluthrin, proffluthrin, empenthrin, allethrin, prallethrin, prallethrin furamethrin, cyclopentene profenthrin terallethrin, etc. Among them, transfluthrin, metofluthrin and proffluthrin are preferable, and transfluthrin is more preferable, in consideration of heat-evaporability, insecticidal efficacy, stability and the like. The pyrethroid-based insecticidal components listed above may be used alone or in a mixture of two or more. In addition, in the pyrethroid-based insecticidal composition, when an optical isomer (optical isomer) or a geometric isomer (geometric isomer) based on an asymmetric carbon (asymmetric carbon) is present in an acid moiety or an alcohol moiety, the optical isomer or the geometric isomer is also included in the pyrethroid-based insecticidal composition that can be used in the present invention.

The invention is characterized in that: the pyrethroid insecticide composition contains 10 to 70 mass% of at least one glycol ether compound having a boiling point of 150 to 300 ℃, preferably 200 to 260 ℃, as a sensitivity-reducing treatment aid for the pyrethroid insecticide component. If the content of the glycol ether compound (sensitivity-reducing treatment assistant) is less than 10% by mass, the effect of reducing the degree of reduction in insecticidal efficacy is not only an obstacle to aqueous formulation but also a lack of effect. On the other hand, even if the content of the glycol ether compound (sensitivity-reducing processing aid) exceeds 70 mass%, not only the pesticidal effect reaches a peak, but also the risk of smoke and fire increases, and there is a fear that the advantage as an aqueous composition is impaired.

In the present specification, a compound that enhances the original insecticidal efficacy of a pyrethroid-sensitive insect pest is sometimes referred to as an "efficacy enhancer", but a compound that reduces the degree of reduction in insecticidal efficacy when the pyrethroid-sensitive insect pest is targeted is distinguished from a conventional "efficacy enhancer" and is defined as a "sensitivity-reducing treatment auxiliary". Although the mechanism of action of both is not clearly explained, the "efficacy enhancer" does not necessarily correspond to the "sensitivity-reducing processing aid".

The conditions of the glycol ether compound that can be used for the purpose of the present invention include (1) conditions for dissolving the pyrethroid insecticide component, (2) conditions for heat-transpiring, (3) 3 conditions for heat-transpiring with 3 components between the pyrethroid insecticide component and water being held at a certain ratio, and (4) conditions for acting as a sensitivity-reducing treatment aid for the pyrethroid insecticide component. Specific examples of such a glycol ether compound include: diethylene glycol monoethyl ether (boiling point: 202 ℃), diethylene glycol monoisopropyl ether (boiling point: 207 ℃), diethylene glycol monobutyl ether (boiling point: 231 ℃), diethylene glycol monoisobutyl ether (boiling point: 220 ℃), diethylene glycol monohexyl ether (boiling point: 259 ℃), diethylene glycol 2-ethylhexyl ether (boiling point: 272 ℃), diethylene glycol monopropyl ether (boiling point: 188 ℃), diethylene glycol monopropyl ether (boiling point: 151 ℃) (boiling point: 188 ℃), diethylene glycol monopropyl ether (boiling point: 210 ℃), diethylene glycol monoethyl ether (boiling point: 283 ℃), triethylene glycol monomethyl ether (boiling point: 188 ℃), dipropylene glycol monopropyl ether (boiling point: 151 ℃), dipropylene glycol monopropyl ether (boiling point: 210 ℃), dipropylene glycol monopropyl ether (boiling point: 2 ℃ether (boiling point: 151 ℃), and mixtures thereof, 3-methoxy-1, 2-propanediol (boiling point: 220 ℃ C.), and the like. Among them, diethylene glycol monoethyl ether, diethylene glycol monoisopropyl ether, diethylene glycol monobutyl ether, diethylene glycol monoisobutyl ether, and diethylene glycol monohexyl ether are preferable, and diethylene glycol monobutyl ether is more preferable. The above-mentioned glycol ether compounds may be used alone or in combination of two or more.

The aqueous insecticide composition for heat transpiration of the present invention is constituted by containing water in addition to the above-mentioned components, and various other components may be blended as long as the intention of the present invention is not impaired. For example, repellent ingredients such as DEET, terpene compounds, natural essential oils and perfumes, antibacterial agents, antifungal agents (antifungals), stabilizers such as Butylated Hydroxytoluene (BHT) and methyl paraben (p-hydroxybenzoic acid methyl ester), pH regulators, colorants, deodorants such as tea extracts and tea dry distillates, and the like may be appropriately blended. In addition, when preparing an aqueous insecticide composition for heat transpiration, a small amount of the following components can be used, as long as the advantages of the aqueous formulation are not impaired: lower alcohols such as ethanol and isopropanol, hydrocarbon solvents such as kerosene, ester or ether solvents, and further, a cosolvent (solvabilizer) and a dispersant may be suitably used.

The aqueous heat-transpiration insecticide composition of the present invention thus prepared is suitable for use in flying pest control products (for example, mosquito repellent liquid) of the type in which the composition is filled into a container body having a wick and the aqueous heat-transpiration insecticide composition is heat-transpired through the wick. That is, the aqueous insecticide composition for heat evaporation is stored in a plastic pharmaceutical solution container made of polypropylene, polyester, polyvinyl chloride, or the like, and the wick is immersed in the aqueous insecticide composition for heat evaporation via the inner plug. The aqueous insecticide composition for heat evaporation in the container is guided to the upper part of the liquid absorbing core, and is heated to 60 to 130 ℃ by the annular heating element disposed around the liquid absorbing core, thereby evaporating into the atmosphere. Since the wick and the heating element are opposed to each other with a gap therebetween, the target surface temperature (60 to 130 ℃) of the upper portion of the wick is achieved by setting the temperature of the heating element to be higher than the target surface temperature of the upper portion of the wick (for example, 80 to 150 ℃). When the heating temperature of the aqueous insecticide composition for heat evaporation is too high, there is a possibility that the aqueous insecticide composition for heat evaporation evaporates early or that the aqueous insecticide composition for heat evaporation is thermally decomposed or polymerized, and as a result, high boiling point substances are formed on the surface of the wick and accumulate, causing clogging. On the other hand, if the heating temperature is too low, the aqueous insecticide composition for heat transpiration is difficult to transpire, and sufficient insect-proofing performance cannot be achieved.

As the raw material of the wick, a raw material which is stable against the pyrethroid-based insecticidal component and absorbs the aqueous solution by capillary phenomenon can be used, and specific examples thereof include: raw materials suitable for molding and firing an inorganic material such as clay (kaolin clay), mica, mullite (mullite), talc, perlite (perlite), diatomaceous earth (diatomaceous earth) or the like and an organic material such as graphite, carboxymethylcellulose (carboxmethyl cellulose) or the like; a plastic core made of polyester fibers, polyamide fibers, polypropylene fibers, or the like; porous ceramic cores, etc., but are not limited to these materials. An antioxidant such as a coloring matter, a preservative, 4 '-methylenebis (2-methyl-6-tert-butylphenol) (4, 4' -methylinebis (2-methyl-6-tert-butylphenol)), stearyl β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, or the like may be appropriately added to the wick.

According to the method for heat-radiating an aqueous pesticidal composition for heat-radiating of the present invention, in a living room, a bedroom or the like, a pyrethroid sensitivity system shows a practical and extremely useful insecticidal effect against mosquitoes such as Culex pipiens pallens, Culex tritaeniorhynchus (Culex tritaeniorhynchus), Culex fatigus (Culex quefasciatus), Culex pipiens molestus (Culex pipiens molestus) or the like, Aedes aegypti (Aedes aegypti), Aedes albopictus (Aedes albopictus) or the like, Chironomidae (Chironomidae) or the like, which have reduced sensitivity. Some of these effects have been recognized for other harmful flying insects such as house flies, gnats (psychodidae), fleas (fley), gadflies (horsefly), gnats (simuloidae), and biting midges (Ceratopogonidae), and particularly have been recognized as characteristic of mosquitoes.

[ examples ]

Next, the water-based insecticide composition for heat transpiration of the present invention and a heat transpiration method using the same will be described in more detail based on specific examples.

[ example 1]

An aqueous insecticide composition for heat transpiration of example 1 of the present invention was prepared by mixing 0.9 mass% of transfluthrin, 50 mass% of diethylene glycol monobutyl ether as a sensitivity reducing treatment assistant, 0.1 mass% of butylated hydroxytoluene as a stabilizer, and 49 mass% of purified water (see the following table 1).

This aqueous insecticide composition for heat transpiration (45 mL) was filled in a plastic container, and after filling a wick via an inner plug, the container was attached to a heat transpiration device (for example, a device disclosed in Japanese patent No. 2926172). The liquid-absorbing core used was a round rod-shaped material made of polyester fibers and having a diameter of 7mm and a length of 70mm, and the temperature of the annular heating element provided around the upper portion of the liquid-absorbing core was set to 130 ℃.

In Thailand where Culex fatigus having reduced sensitivity to pyrethroid insecticide components was observed to inhabit, the heat transpiration device was installed in a 6-tatami room (25 m)³) Was used for 12 hours each day with power on, and as a result, lasted 60 days (about 700 hours) without being bitten by mosquitoes.

Examples 2 to 8 and comparative examples 1 to 6

An insecticidal efficacy confirmation test was carried out by preparing the aqueous insecticide compositions for heat transpiration of the present invention according to example 1 and charging these aqueous insecticide compositions for heat transpiration into the same heat transpiration device as used in example 1. For comparison, aqueous insecticide compositions for heat transpiration of comparative examples 1 to 6, which are outside the scope of the present invention, were prepared. The compositions of the aqueous insecticide compositions for heat transpiration in examples 1 to 8 and comparative examples 1 to 6 and the material of the wick are shown in table 1 below.

Examples 1 to 8 are all aqueous insecticide compositions for heat transpiration containing a pyrethroid insecticide component, a glycol ether compound (sensitivity reducing treatment assistant) having a boiling point of 150 to 300 ℃ and water within the scope of the present invention. In contrast, comparative examples 1 and 2 are pesticide compositions of an oil formulation containing kerosene as a solvent. The specific gravity (about 0.77) of the insecticide compositions of comparative examples 1 and 2 was smaller than that (about 1.0) of the aqueous insecticide compositions for heat transpiration of examples 1 to 8. Therefore, when examples 1 and 2 of the aqueous formulation and comparative examples 1 and 2 of the oil formulation are compared with each other with respect to the amount of transpiration of the insecticide composition, the amount of transpiration on the capacity basis is substantially the same for both, but examples 1 and 2 of the aqueous formulation are larger than those for comparative examples 1 and 2 of the oil formulation on the mass basis. In this case, the use period of each formulation was 60 days with respect to the amount of volatilization of the active ingredient (pyrethroid-based insecticidal ingredient), and examples 1 and 2 were not substantially different from comparative examples 1 and 2. Comparative example 3 used diethylene glycol monobenzyl ether (diethylene glycol monobenzyl ether) having a boiling point of 302 ℃. Comparative example 4 diacetin (diacetin) having a boiling point of 280 ℃ was used instead of the glycol ether compound. These materials had less evapotranspiration than the sensitivity-reducing treatment aids used in the examples. The substances used in comparative examples 3 and 4 were substances that have been conventionally used as "efficacy enhancers" useful for sensitivity systems. Comparative example 5 was set so that the content of the sensitivity-lowering treatment assistant was excessive. Comparative example 6 was set so that the content of the sensitivity-lowering treatment assistant was insufficient. In table 1, "diethylene glycol monobenzyl ether" used in comparative example 3 and "diacetin" used in comparative example 4 do not strictly correspond to the sensitivity-reducing treatment assistant defined in the present invention, but are shown in the item of "sensitivity-reducing treatment assistant" in table 1 for convenience of explanation.

[ Table 1]

< insecticidal efficacy test >

In order to confirm the efficacy of each of the aqueous insecticide compositions for heat transpiration, an insecticidal efficacy test explained below was carried out. Two plastic cylinders having an inner diameter of 20cm and a height of 43cm were stacked, and a cylinder having an inner diameter of 20cm and a height of 20cm (a place where insects to be tested were placed) separated from each other by a 16-mesh wire net was placed on the two cylinders with a rubber packing interposed therebetween, and a cylinder having the same diameter and a height of 20cm was placed thereon. The 4 overlapped cylinders were placed on a circular plate placed on a table with a rubber packing interposed. A round hole of 5cm is arranged in the center of the circular plate, and the heating and steaming body to be tested is placed on the round hole and is electrified for steaming. After 4 hours of energization, about 20 female adults of Aedes aegypti (pyrethroid sensitivity Thailand DMS system or Thailand BS system with reduced sensitivity) of the test insects were released into the upper cylinder, the test insects falling and inclining upward with the passage of time were calculated, and KT was obtained₅₀The value is obtained. In addition, all test insects were recovered after 20 min exposure and their lethality was investigated after 24 hours. The test results are shown in table 2 below.

[ Table 2]

As a result of the test, it was confirmed that the aqueous insecticide composition for heat transpiration of examples 1 to 8 of the present invention comprises: an aqueous heat-transpiration insecticide composition comprising 0.1 to 3.0 mass% of a pyrethroid-based insecticide component, 10 to 70 mass% of at least one glycol ether compound having a boiling point of 150 to 300 ℃ as an adjuvant for the treatment of reducing the sensitivity to the pyrethroid-based insecticide component, and water, wherein the degree of reduction in insecticidal efficacy is reduced compared with the case of an Aedes aegypti mosquito belonging to a system in which the sensitivity to the pyrethroid-based insecticide component is reduced, and the composition is extremely effective in controlling these mosquitoes. Here, the examples 1 to 4 and examples 5 to 7As a comparison, among the glycol ether compounds, diethylene glycol monoalkyl ether compounds having a boiling point of 200 to 260 ℃ are preferable, and diethylene glycol monobutyl ether is more preferable. As the pyrethroid-based insecticidal component, transfluthrin, metofluthrin, and proffluthrin were found to meet the object of the present invention with reference to example 8, and transfluthrin was highly useful. In addition, the results shown in the above Table 2 suggest that KT of mosquitoes to be sensitive to pyrethroid-based insecticidal components₅₀The value (sec) is set to [ A ]]KT of mosquitoes having reduced sensitivity to pyrethroid-based insecticidal component₅₀The value (second) is set to [ B]When, if [ A ]]/[B]If the value of (b) is 0.6 or more, the lethality can be made 100% even for mosquitoes with reduced sensitivity.

In contrast, in the oil formulations based on kerosene of comparative examples 1 and 2, it was observed that the knockdown efficacy of aedes aegypti of the system having reduced sensitivity to pyrethroid-based insecticidal components was significantly reduced as compared with the case of the pyrethroid sensitivity system. In addition, the compositions of comparative examples 3 and 4, which are systematic aedes aegypti having reduced sensitivity to pyrethroid-based insecticidal components, did not exhibit the same effect as the aqueous heat-transpiration insecticide composition of the present invention containing a glycol ether-based compound. From this, it is understood that the conventional "efficacy enhancer" does not necessarily correspond to the "sensitivity-reducing processing aid". In comparative example 5 in which more than 70 mass% of the sensitivity-lowering treatment assistant was added, the risk of the smoke and fire was increased, and the advantage of the aqueous formulation was lost. In comparative example 6, since the amount of the processing aid for reducing sensitivity was too small, a good aqueous composition could not be formed, and the composition could not be used for the insecticidal efficacy test. Therefore, the test results of comparative examples 5 and 6 are not shown in table 2 above.

Example 9 and comparative example 7

An aqueous insecticide composition for heat transpiration of the present invention, example 9, was prepared by blending 1.3 mass% of transfluthrin, 50 mass% of diethylene glycol monobutyl ether as a sensitivity reducing treatment assistant, 0.1 mass% of butylated hydroxytoluene as a stabilizer, and 48.6 mass% of purified water, based on example 1. The aqueous insecticide composition for heat transpiration of example 9 was a long-term use type for 90 days. This aqueous insecticide composition for heat transpiration was filled in a plastic container (45 mL), and then a wick was filled via an inner plug, and then the container was attached to a heat transpiration device. As the liquid-absorbing core, a ceramic core obtained by kneading inorganic powder such as clay or mica with an organic substance such as graphite, forming the mixture into a round rod shape having a diameter of 7mm and a length of 70mm, and firing the round rod shape was used. The temperature of the annular heating element provided around the upper portion of the wick was set to 128 ℃.

On the other hand, an oily formulated insecticide composition for heat transpiration of comparative example 7 was prepared in the same manner as in example 9 except that transfluthrin was dissolved in kerosene at 1.69 mass% (1.3 w/v%), and the insecticide composition for heat transpiration was used in a heat transpiration apparatus similar to example 9.

The following in-situ insecticidal efficacy tests were conducted on the heat evapotranspiration devices of example 9 and comparative example 7.

< field insecticidal efficacy test >

Kraft paper was laid on a 6-tatami living room (25 m) without ventilation³2.7m × 3.6.6 m × height 2.55m), a test heat transpiration device was placed at the center, about 100 female adults of aedes aegypti (pyrethroid sensitivity thailand DMS system or thailand BS system with reduced sensitivity) of the test insects were released at the same time as the start of energization, the test insects falling down and tilting up with the passage of time were counted, and KT was found₅₀The value is obtained. In addition, all test insects were transferred to a clean plastic container after 2 hours of exposure, and cotton wool containing a sugar water was given. The test insects were stored at about 25 ℃ and were investigated for lethality after 24 hours. The test results are shown in table 3.

[ Table 3]

It was also observed in the field insecticidal efficacy test that the insecticidal composition for heat transpiration of example 9 of the aqueous formulation was particularly effective against aedes aegypti of a system in which the sensitivity of the pyrethroid insecticidal component was reduced, compared with the composition of comparative example 7 of the oil formulation, in the case where the sensitivity reducing treatment aid was compounded.

Industrial applicability

The present invention can be used in pest control products for human bodies and pets, and can be used for other applications such as insecticidal, acaricidal, bactericidal, antibacterial, deodorant, and deodorant applications.

Claims (8)

1. An aqueous heat-transpiration insecticide composition for controlling mosquitoes having a reduced sensitivity to pyrethroid-based insecticidal components, comprising:

0.1 to 3.0 mass% of a pyrethroid insecticide component, 10 to 70 mass% of at least one glycol ether compound having a boiling point of 150 to 300 ℃ as a sensitivity-reducing treatment auxiliary for the pyrethroid insecticide component, and water.

2. The aqueous pesticidal composition for thermal transpiration according to claim 1, wherein the glycol ether compound has a boiling point of 200 to 260 ℃.

3. The aqueous pesticidal composition for thermal transpiration according to claim 1 or 2, wherein the glycol ether compound is a diethylene glycol monoalkyl ether.

4. An aqueous pesticidal composition for thermal transpiration according to claim 3, wherein the diethylene glycol monoalkyl ether is diethylene glycol monobutyl ether.

5. The aqueous insecticide composition for thermal transpiration as claimed in any one of claims 1 to 4, wherein the pyrethroid-based insecticidal component is at least one selected from transfluthrin, metofluthrin and proffluthrin.

6. The aqueous insecticide composition for thermal transpiration as claimed in claim 5, wherein the pyrethroid type insecticidal component is transfluthrin.

7. A method of heat-transpiration of an aqueous pesticidal composition for heat-transpiration, comprising immersing a part of a wick in the aqueous pesticidal composition for heat-transpiration of any one of claims 1 to 6, guiding the absorbed aqueous pesticidal composition for heat-transpiration to the upper part of the wick, and heat-transpiring the composition at 60 to 130 ℃.

8. The method for thermal evaporation of an aqueous pesticidal composition for thermal evaporation according to claim 7, wherein the raw material of the wick is a polyester fiber and/or a polyamide fiber, or a porous ceramic.