Pest control agents and methods of use thereof

Abstract

To provide an insecticide that, when used indoors, suppresses the retention of dead insect carcasses indoors. [Solution] A pest control agent characterized by containing the following compounds A and B: Compound A: At least one selected from the group consisting of phenethyl alcohol, β-ionone, dl-citronellol, terpineol, and methyl dihydrojasmonate. Compound B: At least one compound selected from the group consisting of geraniol, α-isomethylionone, and linalool.

Description

Technical Field

[0001] The present invention relates to a pest control agent and a method for using the same.

Background Art

[0002] Conventionally, mosquito coils and the like have been used as combustion-type pest control agents. After adding water to a mixed powder containing a pyrethroid-based pest control component, a combustion base material such as plant powder, and if necessary, a fragrance, a mildew-proof agent, etc., kneading, molding, and drying are performed to manufacture them. However, pest control agents such as mosquito coils have focused on enhancing the diffusibility of the pest control component. When used indoors (or semi-indoors), the carcasses of the killed pests may remain indoors.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object of the present invention is to provide a pest control agent in which the carcasses of killed pests are suppressed from remaining indoors when used indoors.

Means for Solving the Problems

[0005] The present inventor found the above problems in pest control agents such as mosquito coils and, as a result of earnestly studying solutions therefor, found that by using a pest control agent containing Compound A and Compound B described below indoors, it is possible to suppress the carcasses of killed pests from remaining indoors, and thus completed the present invention.

[0006] The present invention provides the following items: Item 1. A pest control agent characterized by containing the following Compound A and Compound B: Compound A: At least one selected from the group consisting of phenethyl alcohol, β-ionone, dl-citronellol, terpineol, and methyl dihydrojasmonate. Compound B: At least one compound selected from the group consisting of geraniol, α-isomethylionone, and linalool.

[0007] Item 2. The insecticide according to Item 1, further comprising a combustion base material, characterized in that it is a combustion-type insecticide.

[0008] Item 3. The insecticide according to item 1 or 2, characterized in that it contains compound A and compound B in a total amount of 0.01 to 10% by mass.

[0009] Item 4. An insecticide according to any one of items 1 to 3, further comprising a pyrethroid compound.

[0010] Section 5. A method for treating a space using compounds A and B below to drive pests from indoors to outdoors: Compound A: At least one selected from the group consisting of phenethyl alcohol, β-ionone, dl-citronellol, terpineol, and methyl dihydrojasmonate. Compound B: Selected from the group consisting of geraniol, α-isomethylionone, and linalool. At least one type.

[0011] Item 6. A method for enhancing the pest control effect, characterized by combining compound B with a pest control agent containing compound A as described below: Compound A: At least one selected from the group consisting of phenethyl alcohol, β-ionone, dl-citronellol, terpineol, and methyl dihydrojasmonate. Compound B: At least one compound selected from the group consisting of geraniol, α-isomethylionone, and linalool. [Effects of the Invention]

[0012] According to the present invention, when used indoors, it is highly effective in driving pests from indoors to outdoors, thus preventing the remains of dead pests from remaining indoors. [Modes for carrying out the invention]

[0013] (1. Pest control agents) The present invention provides an insecticide characterized by containing compound A: at least one selected from the group consisting of phenethyl alcohol, β-ionone, dl-citronellol, terpineol, and methyldihydrojasmonate, and compound B: at least one selected from the group consisting of geraniol, α-isomethylionone, and linalool.

[0014] The mixing ratio of compound A and compound B in the pest control agent of the present invention is not particularly limited. For example, compound B can be mixed in an amount of 1 to 1,000 parts by mass, preferably 5 to 500 parts by mass, and more preferably 10 to 200 parts by mass, with respect to 100 parts by mass of compound A. The amount of compounds used is not particularly limited, but the total mass ratio of these compounds to the total mass of the pest control agent can be, for example, 0.01 to 30% by mass, preferably 1 to 20% by mass, and more preferably 10 to 15% by mass.

[0015] Compounds A and B used in the present invention may be artificially synthesized or extracted from natural products. Furthermore, compounds A and B may be isolated and purified, or natural products containing compound A and / or compound B, or their extracts, may be used and incorporated into the composition. Examples of natural products containing compound A and / or compound B, or their extracts, include turpentine oil, cajeput oil, pine root oil, and nutmeg seed oil containing terpineol; citronella oil and rose oil containing dl-citronellol; rose oil and geranium oil containing phenethyl alcohol; henna containing β-ionone; rose oil, palmarosa oil, and geranium oil containing geraniol; rosewood oil, linaloe oil, camphor oil, orange blossom oil, lavender oil, bergamot, clary sage, and coriander seeds containing linalool.

[0016] The pest control agent of the present invention may be in the form of a single formulation or a combined formulation consisting of multiple formulations. Therefore, in the pest control agent of the present invention, the terms "comprising" and "containing" include not only the mode of containing each component in a single formulation, but also the mode of containing any of the components in multiple formulations (for example, a combined formulation in which one formulation contains compound A and another formulation contains compound B, etc.).

[0017] By using the pest control agent of the present invention, an effect of driving pests from indoors to outdoors can be obtained. In the present invention, "indoors" includes living spaces such as houses and rooms; not only狭义indoors such as vehicles, but also semi-indoors such as concrete floors and entrances. In the present invention, the effect of driving pests from indoors to outdoors includes not only imparting such an effect to a pest control agent that does not have the above-mentioned driving effect, but also enhancing the above-mentioned driving effect that the pest control agent has. In the present invention, the size of the space constituting "indoors" is not particularly limited, but for example, 4.5 to 12 tatami mats can be mentioned. As the pest control agent of the present invention, a combustion-type pest control agent is preferable. In the present invention, the driving effect means driving pests existing indoors (including pests that already existed indoors when the pest control agent was installed and pests that invaded indoors after the pest control agent was installed. Typically, it is the pests that already existed indoors when the pest control agent was installed.) from indoors to outdoors, thereby suppressing the remains of the killed pests from remaining indoors.

[0018] In the present invention, examples of pests include flying pests such as mosquitoes, flies, and bees, and crawling pests such as ants, cockroaches, mites, silverfish, and pillbugs. The present invention can be applied to various pests, but is particularly effective against flying pests, and is very effective against mosquitoes in particular. Also, in this specification, "pest control" means not only repelling pests, but also killing insects and knockdown.

[0019] In the present invention, a combustion-based insecticide containing a combustion substrate is preferred as the insecticide. In this embodiment, the combustion substrate included in the insecticide of the present invention includes a combustion regulating agent, a binder, a fiber material, etc. As a combustion regulating agent, plant-derived powders are used, and more specifically, wood powder, dried plant powder, etc., and it is preferable to use both wood powder and dried plant powder. Examples of wood powders include juniper powder, sandalwood powder, camphor powder, fir powder, cedar powder, hemlock powder, pine powder, willow powder, Kalopanax powder, magnolia powder, linden powder, spruce powder, yellow poplar powder, katsura powder, acacia powder, aspen powder, linden powder, willow powder, Japanese walnut powder, Japanese cypress powder, paulownia powder, ash powder, balsa powder, lauan powder, birch powder, citrus tree powder, etc. The dried plant powder is not particularly limited as long as it is a dried plant powder other than wood flour, but examples include coconut flour, daisy family plant powder, ruby ​​family plant powder, honeysuckle family plant powder, meliaceae family plant powder, thymelaeaceae family plant powder, mint family plant powder, myrtaceae family plant powder, carrot family plant powder, grass family plant powder, mulberry family plant powder, olive family plant powder, pyrethrum extract powder, etc., with coconut flour being preferred. Examples of fiber materials include paper and pulp. These combustion supporters can be used individually or in combination of two or more.

[0020] As binders, those widely used in pest control agents within the art to which the present invention belongs can be used, for example, natural polymers and synthetic polymers, with natural polymers being preferred. Examples of natural polymers include joss powder (tabu powder), sham powder, tobi powder, starch (α-starch, etc.), trang gum, gum arabic, guar gum, gambir extract powder, casein, etc., with joss powder being preferred. Examples of synthetic polymers include polyvinyl alcohol, polyacrylamide, sodium polyacrylate, polyethylene oxide, polyvinylpyrrolidone, methylcellulose, ethylcellulose, hydroxypropylcellulose, carboxymethylcellulose, modified starch (e.g., carboxymethyl starch, dialdehyde starch, and cationic starch), etc. These binders can be used individually or in combination of two or more.

[0021] The combustion base material may optionally contain a bulking agent, a combustion regulator, a synergist, etc. Note that some bulking agents also act as combustion regulators in the technical field of pest control agents to which the present invention pertains. Examples of the bulking agent or combustion regulator include inorganic powders such as calcium carbonate, magnesium carbonate, talc, perlite, and diatomaceous earth. Examples of the synergist include piperonyl butoxide, N-propyl isomer, cinepyrin 222 (trade name), cinepyrin 500 (trade name), lysene 384 (trade name), octachlorodipropyl ether, isobornyl thiocyanoacetate, cinerin, etc. The blending amount of the combustion base material in the combustion-type pest control agent is not particularly limited, and is, for example, 60 to 99.9% by mass, preferably 70 to 99% by mass, more preferably 80 to 90% by mass.

[0022] In the embodiment of the combustion-type pest control agent, its dosage form is not particularly limited, and it may be in the form of an incense stick, or in a form in which Compound A and Compound B, and optionally pest control components and / or fragrance components other than Compound A and Compound B are held in a fiber material such as paper or pulp. Specifically, examples include forms in which Compound A and Compound B, and optionally specific pest control components and / or specific fragrance components are impregnated, coated, kneaded into, etc. in a fiber material such as paper or pulp. Furthermore, a preservative such as sodium dehydroacetate, and a pigment such as a dye or a pigment may be optionally added.

[0023] Furthermore, the pest control agent of the present invention may further contain various pest control components, such as pyrethroid compounds like pyrethrin, allethrin, phthalthrin, resmethrin, flamethrin, phenothrin, permethrin, empenthrin, prallethrin, cyphenothrin, imiprothrin, transfluthrin, metofluthrin, profluthrin, etofenprox, and DEET, with pyrethroid compounds being preferred. These pest control components can be used individually or in combination of two or more. When these pest control components are included, the amount used is not particularly limited, but the total mass ratio of these pest control components to the total mass of the pest control agent can be, for example, 0.01 to 1% by mass. Furthermore, in this embodiment, the ratio of the above-mentioned insect control components, such as pyrethroid compounds, to compounds A and B is not particularly limited, but the total mass ratio of these insect control components to the total amount of compounds A and B can be, for example, 0.001 to 5% by mass, preferably 0.01 to 1% by mass. It is preferable to include these insect control components because they can drive pests from indoors to outdoors, kill the pests that have been driven outdoors, and prevent the carcasses of the dead pests from remaining indoors. In embodiments other than the combustion-type insecticide, the dosage form of the insecticide of the present invention is not particularly limited, but examples include aerosols, fumigants, and naturally evaporating agents.

[0024] In embodiments using pyrethroid compounds, the pest control agent of the present invention can be manufactured by mixing, for example, compound A, compound B, (in the case of a combustion-type pest control agent) a combustion base material and optionally an extender, combustion regulator, synergist, etc., adding a pyrethroid compound to the resulting mixture, kneading it, further adding hot water to thin it out, and then drying it. In embodiments using pyrethroid compounds, preferred pyrethroid compounds include transfluthrin, metofluthrin, profluthrin, etc.

[0025] (2. Pest control methods) The present invention also provides a method for treating a space using compound A and compound B to drive pests from indoors to outdoors. The types and proportions of each compound used in this embodiment are the same as described above. In the present invention, "treating a space" using compound A and compound B has the meaning commonly used in the field of pest control, to which the present invention belongs. Specifically, it means making these compounds present in the target space in order to produce the desired effect. In the present invention, "treating a space" includes making compounds A and B float, volatilize, vaporize, spray, etc., in the space. In embodiments using a combustion-type pest control agent, burning the combustion-type pest control agent to volatilize compounds A and B is also included in the "treatment" described above.

[0026] The following describes specific embodiments of the present invention in more detail using examples and comparative examples, but the present invention is not limited to these examples. [Examples]

[0027] (Eradication effect) We evaluated the mosquito-repelling effect of treating a semi-enclosed space with mosquito coils containing various compounds. (Examples 1-5 and Comparative Examples 1-9: Preparation of mosquito coils) Mixed powder obtained by mixing the raw materials shown in Table 1 (Examples 1-5: 26g, Comparative Examples 1-8: 28g) Compounds A and B were added to the mixture to make 30 g. 30 g of mixed powder obtained by mixing the raw materials shown in Table 1. This was used as Comparative Example 9. To the obtained mixed powder, 30 mL of hot water at approximately 60°C was added and thoroughly kneaded. After kneading, it was molded into a rod shape using an extruder and dried in a dryer at 65°C for 10 hours to obtain the sample.

[0028] [Table 1]

[0029] [Table 2]

[0030] A glass box (45cm tall) with an opening (35cm x 35cm) on the front that can be opened and closed. Ten adult female Culex pipiens mosquitoes were released as test insects into a box measuring (cm x 80cm wide x 80cm high) and allowed to acclimate for at least 3 minutes. The specimen was placed in the center of the bottom of the box, and the opening was opened simultaneously with the start of combustion. The number of test insects escaping through the opening was counted over time for up to 5 minutes. The test was performed twice, and the following ET was determined by the probit method. 90 The values ​​were calculated and the average was determined. In addition, the enhancement rate of the eviction effect by using compounds A and B in combination was calculated using the following formula, and the eviction effect was evaluated. The test space was maintained at room temperature of 25±5℃ and humidity of 50±10%RH. ET 90 Value (seconds) = Time until 90% of the test insects escape. Enhancement rate (%) = 100 - (ET when compounds A and B are combined) 90 Value / ET when compound A is included 90 Value) × 100 The results are shown in Table 3.

[0031] [Table 3]

[0032] Comparing Comparative Examples 6-8 with Comparative Example 9, when compound B was used alone, no eviction effect was observed, and in fact, it decreased. On the other hand, comparing Examples 1-5 with Comparative Examples 1-5, even though compound B, which did not show an eviction effect on its own, was used in combination with compound A, it showed a higher enhancement rate of more than 20% compared to when compound A was used alone. As is clear from these results, it can be said that the eviction effect was significantly enhanced by combining compounds A and B.

[0033] (Examples 6 and 7 and Comparative Examples 10 and 11: Preparation of mosquito coils) The mixed powder obtained by mixing the raw materials shown in Table 1 (Example 6: 27.8g, Example 7: 29.6g) Compounds A and B were added to Comparative Examples 10 and 11 (29.8 g) in the proportions shown in Tables 4 and 5 below to make a total of 30 g. 30 mL of hot water at approximately 60°C was added to the resulting mixed powder and kneaded thoroughly. After kneading, the mixture was molded into a rod shape using an extruder and dried in a dryer at 65°C for 10 hours to obtain the sample.

[0034] [Table 4]

[0035] [Table 5]

[0036] Except for using one of the specimens listed in Tables 4 and 5 above, the expulsion test of female Culex pipiens adult mosquitoes was carried out in the same manner as in Example 1, and the enhancement rate was calculated (the criteria for the enhancement rate are as described in Tables 6 and 7). The results are shown in Tables 6 and 7.

[0037] [Table 6]

[0038] [Table 7]

[0039] Comparing Example 6 with Comparative Examples 1 and 11, even when the amount of compound B was changed, a higher enhancement rate of 18% or more was observed compared to when compound A was used alone. Comparing compound 7 with comparative examples 10 and 11, compound 7 showed a significantly higher enhancement rate of over 17% compared to the case where compound A was used alone, despite the lower amounts of compounds A and B used. As is clear from these results, even when the mixing ratio and amounts of compounds A and B were changed, combining them significantly enhanced the elimination effect. Furthermore, as shown in Examples 2 to 5, the combination of β-ionone and α-isomethylionone showed a similar enhancement rate to the combination of phenethyl alcohol and linalool, and the combinations of methyl dihydrojasmonate and geraniol, dl-citronellol and geraniol, and terpineol and α-isomethylionone also showed similar enhancement rates to the combination of phenethyl alcohol and linalool. Therefore, when compound A is β-ionone, methyldihydrojasmonate, dl-citronellol, or terpineol, and when compound B is geraniol, linalool, or α-isomethylionone, it is thought that the elimination effect of compound A can be enhanced even at low concentrations.

[0040] (Example 8 and Comparative Examples 12-14: Preparation of mosquito coils) Mixed powder obtained by mixing the raw materials shown in Table 1 (Example 8: 25.997g, Comparative Examples 12, 13) Compounds A, B, and metofluthrin were added to 27.997g (29.997g in Comparative Example 14) in the proportions shown in Table 8 below to make 30g. 30mL of hot water at approximately 60°C was added to the resulting mixed powder and kneaded thoroughly. After kneading, the mixture was molded into a rod shape using an extruder and dried in a dryer at 65°C for 10 hours to obtain the sample.

[0041] [Table 8]

[0042] Except for using one of the specimens listed in Table 8 above, the expulsion test of female Culex pipiens adult mosquitoes was carried out in the same manner as in Example 1, and the enhancement rate was calculated (the criteria for the enhancement rate are as shown in Table 9). The results are shown in Table 9.

[0043] [Table 9]

[0044] When using metofluthrin, a comparison between Comparative Example 12 and Comparative Example 13 showed that when compound B was used alone, the repellent effect was not observed, and in fact, it decreased. However, comparing Example 8 with Comparative Example 12, even though compound B, which did not show a repellent effect on its own, was used in combination with compound A, it showed a significantly higher enhancement rate of 53.5% compared to when compound A was used alone. As is clear from these results, it can be said that even in pest control agents containing pyrethroid compounds, the repellent effect was significantly enhanced by combining compounds A and B. Therefore, even in pest control agents containing pyrethroid compounds, the retention of dead insect carcasses indoors can be suppressed by using compounds A and B. Furthermore, by adding pyrethroid compounds such as metofluthrin to pest control agents, it can be expected that the repelled insects will die outdoors.

Claims

1. A pest control agent characterized by containing the following compounds A and B: Compound A: At least one selected from the group consisting of phenethyl alcohol, β-ionone, dl-citronellol, terpineol, and methyldihydrojasmonate. Compound B: At least one compound selected from the group consisting of geraniol, α-isomethylionone, and linalool.

2. The insecticide according to claim 1, further containing a combustion base material, and characterized in that it is a combustion-type insecticide.

3. The insecticide according to claim 1 or 2, characterized in that it contains compound A and compound B in a total amount of 0.01 to 10% by mass.

4. An insecticide according to any one of claims 1 to 3, further comprising a pyrethroid compound.

5. A method for treating a space with the following compounds A and B to drive pests from indoors to outdoors: Compound A: At least one selected from the group consisting of phenethyl alcohol, β-ionone, dl-citronellol, terpineol, and methyl dihydrojasmonate. Compound B: At least one compound selected from the group consisting of geraniol, α-isomethylionone, and linalool.

6. A method for enhancing the pest control effect, characterized by adding compound B to a pest control agent containing compound A as described below: Compound A: At least one selected from the group consisting of phenethyl alcohol, β-ionone, dl-citronellol, terpineol, and methyldihydrojasmonate. Compound B: At least one compound selected from the group consisting of geraniol, α-isomethylionone, and linalool.

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