Flying insect control agents, flying insect control methods, and flying insect control products

Abstract

This invention provides a flying insect control agent that exhibits high control efficacy against flying insects, suppresses phytotoxicity to plants, and minimizes contamination of the treated area. [Solution] The flying insect control agent has a vapor pressure of 1.0 × 10 at 25°C. -5 It contains a pyrethroid compound with a Pa or higher rating, a nonionic surfactant, and water. The average particle size (d) of the micelles formed by the nonionic surfactant is between 8 nm and 200 nm.

Description

[Technical Field]

[0001] This disclosure relates, for example, to flying insect control agents, flying insect control methods, and flying insect control products for controlling flying insects outdoors. [Background technology]

[0002] In recent years, the number of people who engage in activities such as home gardening, yard work, and outdoor recreation has increased. Consequently, people are increasingly troubled by flying insects such as mosquitoes in and around bushes, trees, and other shaded areas.

[0003] In contrast, for example, Patent Document 1 proposes an oil-based aerosol type aerosol for controlling outdoor flying insect pests. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2018-095577 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, because Patent Document 1 uses an oil-based aerosol, there is a possibility of phytotoxicity to plants. Furthermore, while it may be possible to suppress phytotoxicity to plants by incorporating a phytotoxicity-reducing agent, it is thought that the manufacturing cost would increase by incorporating such an agent. In addition, because an oil-based solvent is used, there was a concern that contamination would remain in the treated area.

[0006] This disclosure is made in view of the above points, and its purpose is to provide a flying insect control agent that exhibits a high control effect against flying insects, suppresses phytotoxicity to plants, and is less likely to cause contamination at the treatment site. [Means for solving the problem]

[0007] To achieve the above objective, one aspect of this disclosure may be based on, for example, a flying insect control agent for controlling flying insects outdoors. The flying insect control agent has a vapor pressure of 1.0 × 10⁻⁶ at 25°C. -5 It contains a pyrethroid compound with a Pa or higher, a nonionic surfactant, and water. The average particle size (d) of the micelles formed by the nonionic surfactant is between 8 nm and 200 nm.

[0008] The pyrethroid compound may be transfluthrin. The concentration of the pyrethroid compound can be 0.01 w / v% or more and 0.5 w / v% or less.

[0009] The nonionic surfactant may be polyoxyethylene hydrogenated castor oil. The concentration of the nonionic surfactant can be 0.5 w / v% or more and 5 w / v% or less.

[0010] The ratio of the pyrethroid compound to the nonionic surfactant can be 5:1 to 1:100. The flying insect control agent may also have a composition that does not contain anionic surfactants.

[0011] Another aspect of this disclosure may be based on, for example, a method for controlling flying insects outdoors. In this method for controlling flying insects, the vapor pressure at 25°C is 1.0 × 10⁻⁶. -5 A flying insect control agent is prepared containing a pyrethroid compound with a Pa or higher rating, a nonionic surfactant, and water, wherein the average particle size (d) of the micelles formed by the nonionic surfactant is 8 nm to 200 nm, and the application rate of the pyrethroid compound is 25 mg / m². 2 More than 500mg / m 2 The flying insect control agent can be sprayed as follows:

[0012] In yet another aspect of this disclosure, for example, a flying insect control product for controlling flying insects outdoors may be assumed. The flying insect control product has a vapor pressure of 1.0 × 10⁻⁶ at 25°C. -5A flying pest control agent containing a pyrethroid compound of Pa or more, a nonionic surfactant, and water, and having an average particle size (d) of the micelles formed by the nonionic surfactant of 8 nm or more and 200 nm or less is filled in a spray container. By spraying the flying pest control agent from this spray container, flying pests can be controlled.

Advantages of the Invention

[0013] According to the present disclosure, it has an excellent control effect against flying pests and the effect lasts for a long time. Moreover, in addition to reducing phytotoxicity to plants, it can suppress contamination of the treated area.

Brief Description of the Drawings

[0014] [Figure 1] FIG. 1 is a perspective view of a flying pest control product according to an embodiment of the present invention.

Modes for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be described in detail based on the drawings. Note that the following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its applications, or its uses.

[0016] FIG. 1 is a perspective view of a flying pest control product 100 according to an embodiment of the present invention as seen from the front. The flying pest control product 100 includes a spray container 1 filled with the liquid flying pest control agent according to the present invention. The spray container 1 has a trigger-type ejector 2 and a bottle 3 filled with the flying pest control agent. The bottle 3 is made of, for example, a resin member and may or may not have translucency. The trigger-type ejector 2 is attached to the bottle 3 and is for ejecting the flying pest control agent filled in the bottle 3 to the outside.

[0017] The trigger-type ejector 2 has a pump mechanism 10 for sucking in the flying pest control agent filled in the bottle 3, a swingable trigger 20 for operating the pump mechanism 10, a nozzle 30 that communicates with a discharge hole (not shown) of the pump mechanism 10 and ejects the flying pest control agent discharged from the discharge hole to the outside, and a resin cover 40 provided so as to cover the pump mechanism 10. A tube (not shown) is connected to the suction hole (not shown) of the pump mechanism 10. The tube is disposed inside the bottle 3 and extends vertically until it reaches the bottom of the bottle 3.

[0018] When the user operates to pull the trigger 20 with a finger, the pump mechanism 10 operates, and the flying pest control agent filled in the bottle 3 is sucked up through the tube. The flying pest control agent sucked up through the tube is jetted from the nozzle 30.

[0019] Note that the structure of the spray container 1 is not limited to the structure described above, and any structure capable of jetting the flying pest control agent filled inside is acceptable. The shape and size of the bottle 3 can be set arbitrarily. Further, the flying pest control agent can be filled in a spraying container (not shown) other than the spray container 1 to form a flying pest control product. The spraying container may have a structure that jets the flying pest control agent by compressed air or the like, or may have a structure that jets by an electric pump.

[0020] The flying pest control agent contains a pyrethroid-based compound having a vapor pressure of 1.0×10 -5 Pa or more at 25°C, a nonionic surfactant, and water. In the flying pest control agent, micelles (colloid-like particles) are formed by the nonionic surfactant. The color of the flying pest control agent is, for example, transparent or translucent, so that the sprayed portion (treated portion) is not contaminated.

[0021] The amount of sprayed when the trigger 20 of the spray container 1 is pressed once (amount sprayed per press) can be arbitrarily set by the structure of the pump mechanism 10, the stroke amount of the trigger 20, etc., and in this embodiment, it is set to 0.8 mL or more and 3.0 mL or less. This amount sprayed per press can also be set to 1.0 mL or more and 1.5 mL or less.

[0022] The number of times the trigger 20 of the spray container 1 is operated (number of sprays) may be one or multiple times. The spray may be applied only once to the same spot, or multiple times.

[0023] The average particle size (D50) of the flying insect control agent at a distance of 30 cm from the nozzle 30 is specified to be between 30 μm and 500 μm, but it can also be set to, for example, between 50 μm and 300 μm.

[0024] This document describes a method for measuring the average particle size of a flying insect repellent when it is sprayed from a nozzle. Although not shown in the diagram, the flying insect repellent is sprayed from a position where the distance between the laser beam, which is irradiated from the laser beam irradiation unit of the particle size measuring instrument toward the light receiving unit, and the spray opening of the nozzle 30 of the spray container 1 is 30 cm, so that the sprayed flying insect repellent passes through the laser beam in a direction perpendicular to the direction of irradiation. Measurements are taken during the spraying of the flying insect repellent, and the average particle size (D50) of the flying insect repellent can be determined by analyzing the particle size distribution of the flying insect repellent using an automatic calculation processing unit. This method for measuring the average particle size is conventionally known. The measuring instrument used was a Microtrac-Bell LDSA-SPR-1500A, and the particle size distribution measurement software Aerotrac was used. The measuring instrument was set to the following conditions.

[0025] Measurement method: Auto-start Calculation method: Histogram Measurement automatically begins when a particle is detected in the laser beam's optical path. The particle diameter was measured five times at 0.02-second intervals, and the average of the second to fifth measurements was used as the average particle diameter. The first measurement was excluded because it was taken immediately after particle detection and the value was unstable.

[0026] Micelles can be formed by adjusting the type and amount of nonionic surfactant in the aqueous solution. To form micelles, the concentration of the nonionic surfactant must be adjusted to above the critical micelle concentration. The average particle size (d) of micelles formed by the nonionic surfactant is said to be between 8 nm and 200 nm. The average particle size (d) of micelles formed by the nonionic surfactant can be between 8 nm and 100 nm, or between 8 nm and 30 nm.

[0027] When measuring the average particle size of micelles formed by nonionic surfactants, a particle size distribution analyzer (light scattering type) such as the FPAR-1000 (manufactured by Otsuka Electronics) can be used as a measuring instrument. By using this particle size distribution analyzer, the average particle size (d) of micelles can be accurately measured. It is also possible to measure the average particle size (d) of micelles using a different measuring instrument.

[0028] Pyrethroid compounds that evaporate easily at room temperature are desirable. The vapor pressure of such pyrethroid compounds at 25°C is 1.0 × 10⁻⁶. -5 It is stated to be above Pa. The vapor pressure of pyrethroid compounds at 25°C is 1.0 × 10⁻⁶. -4 It is also possible to set the level to Pa or higher. This can further enhance the effectiveness of controlling flying insect pests.

[0029] Examples of pyrethroid compounds to be included in the flying insect control agent include transfluthrin, metofluthrin, profluthrin, empenthrin, terrarethrin, and tetraflumethrin, and any one or any two or more of these can be used in combination. Transfluthrin and metofluthrin are particularly preferred as pyrethroid compounds to be included in the flying insect control agent.

[0030] The concentration of pyrethroid compounds (w / v% of the total liquid) is specified as being between 0.01 w / v% and 0.5 w / v%. However, the concentration of pyrethroid compounds can be between 0.1 w / v% and 0.2 w / v%.

[0031] Examples of nonionic surfactants to be included in the flying insect control agent include polyoxyethylene hydrogenated castor oil and polyoxyethylene polyoxypropylene decyltetradecyl ether. Only one of these may be included, or they may be included in combination.

[0032] The concentration of nonionic surfactant (w / v% of the total liquid) is specified as 0.5 w / v% to 5 w / v%. The concentration of nonionic surfactant can be 1.0 w / v% to 2.5 w / v%.

[0033] Furthermore, the flying insect control agent may contain anionic surfactants, cationic surfactants, and amphoteric surfactants other than nonionic surfactants. Alternatively, the flying insect control agent may have a composition that does not contain anionic surfactants.

[0034] The ratio of pyrethroid compounds to nonionic surfactants is generally considered to be between 5:1 and 1:100. However, the ratio can also be between 2:1 and 1:50.

[0035] The water (solvent) contained in the flying insect control agent may be any of the following: tap water, deionized water, purified water, etc. Two or more of these may be mixed together.

[0036] The flying insect control agent may contain other solvents. Examples of other solvents include hydrocarbon solvents, ester solvents, glycol solvents, and alcohol solvents, and the agent may contain only one of these or any two or more. Examples of hydrocarbon solvents include paraffin, isoparaffin, and kerosene, and the agent may contain only one of these or any two or more. Examples of ester solvents include isopropyl myristate. Examples of glycol solvents include propylene glycol monomethyl ether (PGME).

[0037] Examples of alcohol-based solvents include ethanol, propanol, isopropanol, etc., and the product may contain only one of these, or any two or more of them.

[0038] The concentration of the water-containing solvent (w / v% of the total liquid) can be between 94.5 w / v% and 99.5 w / v%.

[0039] The flying insect control agent may contain ingredients other than those listed above (other ingredients). Examples of other ingredients include other insecticides, insect repellents, animal repellents, fungicides and preservatives, other surfactants, deodorizers, thickeners, pH adjusters, fragrances, dyes, efficacy enhancers, UV absorbers, antioxidants, etc. The agent may contain only one of these, or any two or more.

[0040] Examples of the above-mentioned antibacterial and preservative ingredients include parabens. Examples of parabens include methylparaben, ethylparaben, propylparaben, and butylparaben, and the product may contain only one of these or any two or more of them.

[0041] Examples of the above-mentioned antioxidants include dibutylhydroxytoluene (BHT).

[0042] The treatment amount (spraying amount) of the flying pest control agent is 2 mL / m 2 or more and 10 mL / m 2 or less. The treatment amount of the flying pest control agent can be 3 mL / m 2 or more and 7 mL / m 2 or less.

[0043] In the method for controlling flying pests using a flying pest control agent, first, a flying pest control agent filled in the spray container 1 is prepared. Then, the flying pest control agent is sprayed so that the spraying amount (mg / m 2 ) per unit area of the pyrethroid-based compound is within a predetermined range. Specifically, the spraying amount (treatment amount) of the pyrethroid-based compound is 25 mg / m 2 or more and 500 mg / m 2 or less. The treatment amount of the pyrethroid-based compound can be, for example, 50 mg / m 2 or more and 250 mg / m 2 or less.

[0044] Examples of the flying pests to be controlled by the flying pest control agent, the method for controlling flying pests, and the flying pest control product 100 according to the present embodiment include mosquitoes, flies, house flies, midges, gadflies, and fungus gnats. However, the flying pest control agent, the method for controlling flying pests, and the flying pest control product 100 exhibit a high control effect especially against mosquitoes.

[0045] Mosquitoes include, for example, Asian tiger mosquitoes, Aedes aegypti, Culex pipiens, Culex tritaeniorhynchus, Culex pipiens, Culex tropicalis, Anopheles mosquitoes, etc. Flies include, for example, houseflies, blowflies, black flies, flesh flies, etc. Small flies include, for example, Drosophila melanogaster, phorid flies, fungus gnats, drain flies, etc. Midges include, for example, Chironomus serrata. Crane flies include, for example, Leiosoma rhodopolium, and Crane flies. Furthermore, the flying insects that can be controlled by the flying insect control agent, flying insect control method, and flying insect control product 100 include not only adults but also larvae. In addition, the flying insect control agent, flying insect control method, and flying insect control product 100 also exert a control effect against the eggs of flying insects, specifically by inhibiting hatching.

[0046] Furthermore, the flying insect control agent, flying insect control method, and flying insect control product 100 according to this embodiment also exhibit control effects against crawling insects, for example. Examples of crawling insects against which control effects are observed include cockroaches and ants. Cockroaches include, for example, the German cockroach, the American cockroach, the Japanese cockroach, and the American cockroach. Ants include, for example, the black carpenter ant, the reticulated ant, the Argentine ant, and the red imported fire ant.

[0047] The flying insect control agent, flying insect control method, and flying insect control product 100 are intended for use outdoors. For example, they can be used on balconies, entrances, around houses, garages (parking lots, bicycle parking areas), gardens, around tents, inside tents, outdoor toilets, old tires, tree stumps, puddles, bushes, grassy areas, around garden trees, in shaded areas, on the ground, and in fishing ports.

[0048] When spraying the flying insect control product 100, various spraying methods can be used, such as spraying into the air, spraying onto the ground, spraying downwards, spraying upwards, or spraying directly onto insects, objects, or buildings.

[0049] The method of using the flying insect control product 100 is not particularly limited, but for example, from a distance of 50 cm to 100 cm from the target object, it can be used at a distance of 1 m.2 Perform the spraying operation (pulling trigger 20) two to ten times. This ensures that the flying insect repellent is evenly applied to the target object. [Examples]

[0050] The following describes examples of the present invention, but the present invention is not limited to these examples.

[0051] Table 1 shows the formulations of the examples and comparative examples. Examples of compounding methods include the following:

[0052] A pyrethroid compound, a nonionic surfactant, ethanol, a preservative, and an antioxidant are mixed and dissolved under heating conditions of 60°C, and then deionized water is added and stirred. However, this preparation method is just one example and is not limited thereto.

[0053] [Table 1]

[0054] Comparative Example 1 is a formulation containing a nonionic surfactant and an anionic surfactant. Comparative Example 3 is an oily aerosol containing 0.2% transfluthrin, normal paraffin as a solvent, and LPG (liquefied petroleum gas) as a propellant, with a liquid-to-gas ratio (liquid / gas) of 30 / 70.

[0055] (Mosquito repellent test 1) Test location: Outdoors where Aedes albopictus mosquitoes are present. Test insect: Female Asian tiger mosquito (Aedes (Stegomyia) albopictus) Method: Human decoy method A 6m x 6m square area was prepared as the test area in an outdoor location where Aedes albopictus mosquitoes were present. Mosquitoes were captured in the center of this area during the 8 minutes prior to treatment, and this count was defined as the number of mosquitoes present before treatment.

[0056] Subsequently, the test agent (the flying insect control agent contained in flying insect control product 100) was applied to the grassy areas, bamboo groves, and shrubs at the test site at a depth of 1 m. 2 5 mL per 16 ml 2 The spray was applied at a distance of 80 cm from the target object, with approximately 80 mL per spray.

[0057] Six, twelve, and fifteen hours after spraying with the flying insect control product 100, flying insects were captured and counted for eight minutes at each time, and these were recorded as the number of insects that flew in after treatment.

[0058] The flight deterrence rate was calculated using the following formula.

[0059] Flight prevention rate (%) = (1 - (Number of aircraft after treatment) / Number of aircraft before treatment)) × 100 The results are shown in Table 2. Example 1 achieved a flight prevention rate of over 90% even 15 hours after spraying, demonstrating that the control effect lasts for a long time.

[0060] [Table 2]

[0061] (Mosquito repellent test 2) Test location: Outdoors where Aedes albopictus mosquitoes are present. Test insect: Female Asian tiger mosquito (Aedes (Stegomyia) albopictus) Method: Human decoy method A 4m x 4m square area was prepared as the test area in an outdoor location where Aedes albopictus mosquitoes were present. Mosquitoes were captured in the center of this area during the 8 minutes prior to treatment, and this count was defined as the number of mosquitoes present before treatment.

[0062] Subsequently, the test agent (the flying insect control agent contained in flying insect control product 100) was applied to the grassy areas, bamboo groves, and shrubs at the test site at a depth of 1 m. 2 5 mL per 16 ml 2 The spray was applied at a distance of 80 cm from the target object, with approximately 80 mL per spray.

[0063] After spraying the flying insect control product 100, flying insects were captured and counted for 8 minutes at 30 minutes, 20 hours, 24 hours, 27 hours, and 44 hours after each treatment, and these counts were recorded as the number of insects that flew in after treatment.

[0064] Then, as in mosquito repellent test 1, the rate of preventing mosquito infestation was calculated.

[0065] The results are shown in Table 3. Examples 3, 5, 6, and 7 achieved a flight prevention rate of over 80% even 27 hours after spraying, indicating that the control effect lasts for a long time.

[0066] [Table 3]

[0067] (Cockroach extermination test) Test insect: Female Oriental cockroach (Periplaneta fuliginosa) Method: A glass ring (8 cm in diameter) was placed on the ground, and five test insects were placed inside the glass ring. Then, 3 mL of the test agent (a flying insect control agent contained in flying insect control product 100) was sprayed into the glass ring from a distance of 80 cm. Knockdown of the test insects was observed over time, and lethality was confirmed after 24 hours. The test was repeated three times.

[0068] The results are shown in Table 4. Examples 1-4 achieved a mortality rate of 60% or higher. Note that the unit of KT50 is "seconds".

[0069] [Table 4]

[0070] (Particle size distribution measurement test) Test equipment: Particle size distribution analyzer (light scattering type) (Otsuka Electronics Co., Ltd.) FPAR-1000 The measurement results are shown in Table 5. In Example 3, it was found that the average particle size (d) of the micelles remained below 100 nm even after storage in a 50°C storage chamber for one week (50°C 1w storage) and for two months (50°C 2m storage).

[0071] [Table 5]

[0072] (Drug-induced harm testing) Test plants: Vinca, Pentas, Oxalis Method: The test agent (a flying insect control agent contained in flying insect control product 100) was sprayed onto the test plants, and the presence or absence of phytotoxicity in each test plant was visually checked three days after spraying.

[0073] The results are shown in Table 6. Example 3 did not cause phytotoxicity to periwinkle or pentas. Although some wilting was observed in oxalis, it was not problematic. On the other hand, comparative examples 1 to 3 caused phytotoxicity to periwinkle and pentas.

[0074] [Table 6]

[0075] 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]

[0076] As described above, the flying insect control agent, flying insect control method, and flying insect control product relating to this disclosure can be used, for example, against mosquitoes. [Explanation of Symbols]

[0077] 1. Spray container 2. Trigger-type sprayer 3 bottles 10 Pump mechanism 20 Triggers 30 nozzles 100 Flying Insect Control Products

Claims

1. The vapor pressure at 25°C is 1.0 × 10⁻⁶ －５ A flying insect control agent comprising a pyrethroid compound with a Pa or higher pH, a nonionic surfactant, and water, wherein the average particle size (d) of the micelles formed by the nonionic surfactant is 8 nm or more and 200 nm or less.

2. In the flying insect control agent according to claim 1, The aforementioned pyrethroid compound is transfluthrin, a flying insect control agent.

3. In the flying insect control agent according to claim 1, The concentration of the pyrethroid compound is 0.01 w / v% or more and 0.5 w / v% or less, and is a control agent for flying insects.

4. In the flying insect control agent according to claim 1, The aforementioned nonionic surfactant is polyoxyethylene hydrogenated castor oil, which is used as a control agent for flying insects.

5. In the flying insect control agent according to claim 1, The concentration of the nonionic surfactant is 0.5 w / v% or more and 5 w / v% or less, in a flying insect control agent.

6. In the flying insect control agent according to claim 1, A flying insect control agent wherein the ratio of the pyrethroid compound to the nonionic surfactant is 5:1 to 1:

100.

7. In the flying insect control agent according to claim 1, A flying insect control agent that does not contain anionic surfactants.

8. The vapor pressure at 25°C is 1.0 × 10⁻⁶ －５ A flying insect control agent is prepared that contains a pyrethroid compound with a Pa or higher strength, a nonionic surfactant, and water, wherein the average particle size (d) of the micelles formed by the nonionic surfactant is 8 nm or more and 200 nm or less. The amount of pyrethroid compound sprayed is 25 mg / m². ２ 500mg / m or more ２ A method for controlling flying insects, comprising spraying the aforementioned flying insect control agent in the following manner.

9. The vapor pressure at 25°C is 1.0 × 10⁻⁶ －５ A flying insect control product comprising a pyrethroid compound with a Pa or higher pH, a nonionic surfactant, and water, wherein the average particle size (d) of the micelles formed by the nonionic surfactant is 8 nm or more and 200 nm or less, and the spray container is filled with this flying insect control agent.

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