Pest control agents

Abstract

To provide an insect pest control agent having a superior insect pest control effect.SOLUTION: An insect pest control agent includes: at least one kind selected from a group composed of pyrethrum extract, surfactant and alcohol; a polyethylene glycol; and water. A content of the polyethylene glycol is 1 to 15 wt.% based on an entire amount of the insect pest control agent. The insect pest control agent produces a superior insect pest control effect. An insect pest control method applies the insect pest control agent to have contact with a pest insect so that the pest insect can efficiently be controlled.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a pest control agent.

Background Art

[0002] Due to the increasing natural and safety orientations of consumers, pest control agents containing natural components, such as and water, have been developed (for example, Patent Document 1, Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

[0007] The pyrethrum extract used in the insecticide of the present invention is an extract from naturally occurring pyrethrum. This pyrethrum extract typically contains six active ingredients: pyrethrin I, pyrethrin II, synerin I, synerin II, jasmolin I, and jasmolin II. These six ingredients together are called total pyrethrins, and the pyrethrum extract used in the present invention contains 10-90% total pyrethrins. The pyrethrum extract content is typically 0.05-1% by weight, preferably 0.05-0.5% by weight, relative to the total amount of the insecticide.

[0008] Alcohols used in the pest control agent of the present invention include alcohols having 1 to 4 carbon atoms, such as ethanol, n-propanol, isopropanol, and n-butanol. Among these, isopropanol and ethanol are preferred.

[0009] Examples of surfactants used in the pest control agent of the present invention include glycerin fatty acid esters sold as DECAGLYN-1-OV by Nikko Chemicals Co., Ltd., 01075TX by Takemoto Oil Co., Ltd., sorbitan fatty acid esters sold as New Calgen D-935 by Takemoto Oil Co., Ltd., Leodol SP-030V by Kao Chemical Co., Ltd., Leodol SP-S10V by Kao Chemical Co., Ltd., Leodol SP-P10 by Kao Chemical Co., Ltd., Emanon CH-40 (manufactured by Kao Corporation, POE(40) hydrogenated castor oil), Emanon CH-60 (manufactured by Kao Corporation, POE(60) hydrogenated castor oil), and Emanon CH-80. Examples include polyoxyethylene hydrogenated castor oil with an average number of added ethylene oxides of 25 to 100 moles, sold as products such as (Kao Corporation, POE(80) hydrogenated castor oil), Nikkol HCO40 (Nikko Chemicals Co., Ltd., POE(40) hydrogenated castor oil), Nikkol HCO60 (Nikko Chemicals Co., Ltd., POE(60) hydrogenated castor oil), Nikkol HCO100 (Nikko Chemicals Co., Ltd., POE(100) hydrogenated castor oil), New Calgen D-240K (Takemoto Oil Co., Ltd., POE(40) hydrogenated castor oil), and New Calgen D-260K (Takemoto Oil Co., Ltd., POE(60) hydrogenated castor oil). These surfactants may be used individually or in combination of two or more. The surfactant content is usually 1.0 to 10% by weight relative to the total amount of the pesticide.

[0010] Examples of polyethylene glycol used in the pest control agent of the present invention include polyethylene glycol with an average molecular weight of 180 to 640, sold as PEG200, PEG300, PEG400, PEG500, PEG600, etc. The polyethylene glycol content is 1 to 15% by weight, preferably 2.5 to 10% by weight, and more preferably 5 to 10% by weight, based on the total amount of the pest control agent.

[0011] The water content in the pest control agent of the present invention is at least 40% by weight, preferably 50% by weight, more preferably 60% by weight, even more preferably 70% by weight, and even more preferably 80% by weight or more, based on the total amount of the pest control agent.

[0012] The pest control agent of the present invention may, as necessary, contain pest control components other than pyrethrum extract, preservatives, fungicides, fungicides, deodorizers, pH adjusters, chelating agents, solubilizers, thickeners, fragrance components, and the like.

[0013] Examples of preservatives include eucalyptus oil, phenoxyethanol, and parabens such as methylparaben. When preservatives are included, the amount is usually 0.1 to 2.0% by weight relative to the total amount of the pest control agent.

[0014] Examples of pH adjusters include monopotassium citrate, citric acid, disodium hydrogen phosphate, potassium dihydrogen phosphate, sodium carbonate, and sodium bicarbonate. When a pH adjuster is included, its content is usually 0.01 to 0.1% by weight relative to the total amount of the pest control agent.

[0015] Examples of chelating agents include metal salts of ethylenediaminetetraacetic acid (EDTA), such as the sodium salt of ethylenediaminetetraacetic acid (EDTA); metal salts of ethylenediamine-N,N'-disuccinic acid (EDDS), such as the sodium salt of ethylenediamine-N,N'-disuccinic acid (EDDS); and metal salts of gluconates, such as sodium gluconate and potassium gluconate.

[0016] Examples of solubilizers include propylene glycol, glycerin, and 1,3-butanediol. Of these, propylene glycol and glycerin also have antifreeze properties. When solubilizers are included, their content is usually 0.5 to 5.0% by weight relative to the total amount of the pest control agent.

[0017] Fragrance components include synthetic fragrances and plant essential oils, with plant essential oils being particularly preferred. Specific examples of plant essential oils include cypress oil, hinoki oil, cedarwood oil, anise oil, sandalwood oil, clove oil, pimenta oil, pine oil, pine needle oil, manuka oil, patchouli oil, star anise oil, hyssop oil, palmarosa oil, lemongrass oil, thyme oil, dill oil, celery oil, peppermint oil, lemon eucalyptus oil, citronella oil, lemon-scented tea tree oil, lavender oil, geranium oil, rosemary oil, tea tree oil, bergamot oil, orange oil, marjoram oil, juniper berry oil, ylang-ylang oil, clary sage oil, and rose oil. When fragrance components are included, their content is usually 0.02 to 0.2% by weight relative to the total amount of the pesticide.

[0018] The pest control agent of the present invention is usually formulated as an emulsifier or solubilizer. Typically, an oil phase premix is ​​prepared by adding pyrethrum extract, a surfactant, and optionally an oily component (e.g., a preservative, a fragrance component), and an aqueous phase premix is ​​prepared by adding alcohol, polyethylene glycol, and water, and optionally an aqueous component (e.g., a pH adjuster). The emulsifier or solubilizer can then be prepared by mixing these two premixes. When formulating an emulsifier, it is preferable to prepare it so that the emulsified particle size is 5.0 μm or less, preferably 1.5 μm or less. The emulsified particle size referred to here is the 90% particle size measured by volume distribution measurement using Mastersizer 3000 (Spectris Co., Ltd.).

[0019] The pest control agent of the present invention can obtain excellent pest control effects by being applied so as to directly contact pests. Specific application methods include, for example, a method of spraying the pest control agent directly on pests for control, or a method of spraying it in advance on the floor surface, wall surface, fiber products such as carpets and sheets, and controlling it when pests come into contact with the sprayed pest control agent, which is an application as a spray agent. In addition, there is also an application as a coating agent, where the pest control agent is applied in advance on the floor surface, wall surface, etc., and the pests are controlled when they come into contact with the applied pest control agent.

[0020] When applying as a spray agent, for example, it can be applied as a spray agent with a trigger-type or finger-type spray head attached to a container filled with the pest control agent of the present invention, or as an aerosol agent filled in a pressure-resistant container having a spraying mechanism together with an aerosol such as LPG, dimethyl ether, nitrogen gas, carbon dioxide gas, etc. together with the pest control agent of the present invention.

[0021] When applying as a spray agent, usually, a spray head is selected such that the spray amount per spray is 0.5 - 1.5 ml, and the average spray particle diameter at a spray distance of 15 - 30 cm is 80 - 350 μm. Here, the average spray particle diameter refers to the volume cumulative 50% particle diameter of the spray particles passing through a position 15 - 30 cm from the nozzle tip of the spray agent, and it can be measured by a laser diffraction particle size measuring device AEROTRAC SPR MODEL - 7340 manufactured by Nikkiso Co., Ltd.

[0022] When applying as a coating agent, for example, it can be applied as a sheet agent in which the pest control agent of the present invention is impregnated in a non-woven fabric made of PET or pulp, or as a roll-on agent filled in a roll-on container in which the composition in the container can be applied by pressing and rolling a ball with the pest control agent of the present invention.

[0023] The pests to be controlled by the pest control agent of the present invention include flies such as house flies, small flies such as Drosophila and butterfly flies, mosquitoes such as Aedes aegypti and Culex pipiens, cockroaches such as Blattella germanica and Blatta orientalis, fleas, lice such as Pediculus humanus, mites, ticks such as Ornithodoros moubata, spider mites such as Tetranychus urticae, rust mites, red mites, house mites, claw mites, southern claw mites, etc. Among them, it is excellent in controlling cockroaches or mites.

Example

[0024] Hereinafter, the present invention will be further described by way of examples, but the present invention is not limited to these examples.

Example

[0025] 0.27g of pyrethrum extract (manufactured by Botanical Resources Australia Pty Ltd, Sumitomo Natural Pyrethrin 75, natural pyrethrin content: 75% by weight), 0.2g of eucalyptus oil (manufactured by Daiho Fragrance Co., Ltd.), 0.1g of peppermint oil (manufactured by Daiho Fragrance Co., Ltd.), 0.9g of phenoxyethanol (manufactured by Sanyo Chemical Industries, Ltd., Newpol EFP), 4.5g of sorbitan fatty acid ester (manufactured by Takemoto Oil & Fat Co., Ltd., Newcalgen D-935), 3.0g of polyoxyethylene hydrogenated castor oil (manufactured by Takemoto Oil & Fat Co., Ltd., Newcalgen D-260K), and 2.5g of propylene glycol (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.) were weighed into a 100ml SUS beaker and mixed with a stirring rod to obtain 11.47g of oil phase premix. Next, 0.03 g of potassium dihydrogen phosphate (manufactured by Kanto Chemical Co., Ltd.), 0.03 g of disodium hydrogen phosphate (manufactured by Kanto Chemical Co., Ltd.), 1 g of polyethylene glycol 400 (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.), and 87.47 g of purified water were weighed into a 200 mL SUS beaker and mixed with a stirring rod to obtain 88.6 g of aqueous phase premix. The aqueous phase premix was mixed using a 3-1 motor (BL600, manufactured by Shinto Chemical Co., Ltd.) equipped with a stirring blade (propeller R, diameter 5 cm, manufactured by Shinto Chemical Co., Ltd.) at a rotation speed of 300 rpm, while the oil phase premix was added dropwise using a pipette over 57 seconds. Then, the rotation speed of the 3-1 motor was changed to 400 rpm and mixed for 15 minutes to obtain the pest control agent of the present invention.

[0026] Various pest control agents were prepared according to Example 1, as shown in Table 1.

[0027] Table 1 TIFF0007894129000001.tif69131

[0028] [Preparation of spray] 100g of each of the pest control agents from Examples 1-4 and Comparative Examples 1-2 were filled into commercially available spray containers (300ml capacity), and a trigger-type spray head (Canyon, model T-014) was attached to obtain the spray.

[0029] [Direct spraying test on German cockroaches] Margarine was applied to the inside of the sides of a poly cup (bottom diameter 105 mm, depth 70 mm), and filter paper (ADVANTEC No.2 φ106 mm) was placed at the bottom. Ten adult German cockroaches (5 females and 5 males) were then placed inside the cups. Six of these were prepared, and the aforementioned spray agents, containing the pest control agents of Examples 1-4, Comparative Example 1, and Comparative Example 2, were sprayed twice from a distance of 30 cm from the bottom of each poly cup, with the spray nozzle of the spray agent facing the filter paper. (Spray volume 2 ml) Twenty minutes after spraying, the German cockroaches were transferred to six separately prepared poly cups (bottom diameter 80 mm, depth 43 mm, with margarine applied to the inside of the sides), and left to stand for 24 hours at 25°C with food and water provided. The number of cockroaches that died from the bitterness was counted. Table 2 shows the rate of death from bitterness.

[0030] Table 2 TIFF0007894129000002.tif3837

[0031] [Indirect spraying test on German cockroaches] A decorative board (15 x 15 cm) was placed on the floor, and the spray agent was sprayed once from a distance of 30 cm above, aiming at approximately the center of the board (spray volume 1 ml). After standing for 15 minutes in a room at room temperature of 25°C, 10 adult German cockroaches (5 females and 5 males) were placed in a poly cup (bottom diameter 80 mm, depth 70 mm, margarine applied to the inner sides), the decorative board was placed on top, and the cup was inverted. After standing for 1 minute, the cup was inverted again and the decorative board was removed. The German cockroaches were given solid feed and water and left to stand for 24 hours, and the number of cockroaches that died from bitterness was counted. The indirect spray test was performed with the spray agents filled with the pest control agents of Example 1, Example 3, Example 4, and Comparative Example 1. Table 3 shows the rate of cockroach death from bitterness.

[0032] Table 3 TIFF0007894129000003.tif2937

[0033] In the pest control agent of Example 2, polyethylene glycol 400 was replaced with polyethylene glycol 200, polyethylene glycol 300, and polyethylene glycol 600 to create the pest control agents of the present invention (referred to as Examples 5 to 7).

[0034] 100g each of the pest control agents from Examples 5-7 was filled into commercially available trigger spray containers (300ml capacity), and a trigger-type spray head (Canyon, model T-014) was attached to obtain a spray. A direct spray test was then conducted on the aforementioned German cockroaches using this spray. The results are shown in Table 4.

[0035] Table 4 TIFF0007894129000004.tif2337

Claims

1. An insecticide containing pyrethrum extract, at least one selected from the group consisting of surfactants and alcohols, polyethylene glycol, and water, The aforementioned alcohols are one or more selected from the group consisting of ethanol, n-propanol, isopropanol, and n-propanol. Polyethylene glycol is polyethylene glycol with an average molecular weight of 180 to 640. The water content is at least 40% by weight of the total amount of the pest control agent. An insecticide characterized in that the polyethylene glycol content is 1 to 15% by weight relative to the total amount of the insecticide.

2. An insecticide containing pyrethrum extract, at least one selected from the group consisting of surfactants and alcohols, polyethylene glycol, and water, The aforementioned alcohols are one or more selected from the group consisting of ethanol, n-propanol, isopropanol, and n-propanol. Polyethylene glycol is polyethylene glycol with an average molecular weight of 180 to 640. The water content is at least 40% by weight of the total amount of the pest control agent. An insecticide characterized in that the polyethylene glycol content is 2.5 to 10% by weight relative to the total amount of the insecticide.

3. An insecticide containing pyrethrum extract, at least one selected from the group consisting of surfactants and alcohols, polyethylene glycol, and water, The aforementioned alcohols are one or more selected from the group consisting of ethanol, n-propanol, isopropanol, and n-propanol. Polyethylene glycol is polyethylene glycol with an average molecular weight of 180 to 640. The water content is at least 40% by weight of the total amount of the pest control agent. An insecticide characterized in that the polyethylene glycol content is 5 to 10% by weight relative to the total amount of the insecticide.

4. An insecticide according to any one of claims 1 to 3, wherein the target of control is cockroaches or mites.

5. A method for controlling pests, characterized by applying the pest control agent described in any one of claims 1 to 4 so as to come into contact with the pests.

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