JP6538424B2 - Insect and insect repellent method for grain and dry matter - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an insect repellent for grains and dry matter, and more particularly, to a grain and dry matter pest used for storage of grains and dry matter such as rice, which can be easily used in general household and safe for human body. Insect repellant suitable for the control of

  Conventionally, grains such as rice, wheat, barley, beans stored in grain warehouses, rice, flour, beans stored in ordinary household, or dried products such as pasta, sashimi, dried bonito, futon, kanpyo (Hereinafter, grains and dry matter may be collectively referred to as "cereals") Pests (hereinafter sometimes referred to as "cereal pests") such as bilberry, kokuzou, noshimedaaraigai will propagate and damage to grains There was a problem that

  In order to prevent such damage to cereals and pests, a method of storing the inside of a warehouse at a low temperature by fumigating the inside of the warehouse with a fumigant such as aluminum phosphide or phosphine is carried out. In addition, other pesticides and pyrethroid compounds are also sprayed. However, methyl bromide, which has been widely used for fumigation in the past, was designated as an ozone depleting substance by the United Nations in 1992, and it is said that the use in developed countries will be completely abolished by 2005 by the Montreal Protocol Conclusions Conference. As a result of its decision, its use in Japan is basically prohibited in 2005.

  On the other hand, with respect to the distribution stage of cereals and storage of cereals in general households, methods such as those practiced in cereal warehouses as described above are difficult in terms of cost, equipment, and safety. It is the present condition. In addition, since the above-mentioned cereals are foods, sufficient consideration must be given to the safety of drugs used.

  Therefore, in recent years, various insect repellents that can easily prevent damage to cereals and pests in general households have been proposed. For example, insect repellents for rice using red pepper, wasabi, mustard, ginger, garlic and the like are commercially available. It is done.

  In addition, a quality preservation agent of rice containing a spice component containing an allicin component and a capsaicin component in a breathable container and containing this container together with rice in a rice container such as rice flour or a rice packaging bag (Patent Document 1) There has also been proposed a weevil repellent (Patent Document 2) comprising tea tree oil and / or pine oil derived from natural products as an active ingredient.

  Although these insect repellents use drugs that are used in natural products or foods, there is no problem with safety, but their effects against cereals and pests are low and sufficient insect repellent effects can not be obtained is the current situation. Furthermore, insect repellents using wasabi or garlic may have strong odors, and this odor may be transferred to grains. In addition, some components are highly irritating to the mucous membrane and the skin, and an insect repellent having a low irritantness and high insecticidal efficacy has been required.

  By the way, the present applicant has been researching on insect repellents for grain and dry matter, and the insect and insect repellent for grain and dry matter characterized in that it already contains one or two or more kinds of alcohol having 1 to 10 carbon atoms as an active ingredient. Insecticide for grain and dry matter containing as an active ingredient one or two or more of essential oils obtained from sage, rosemary, basil, caraway, eucalyptus, citronella, anise, orange or lavender (patent document 3) Reference 4), an insect repellent for grains and dry matter containing one or more terpene compounds (Patent Document 5), one of a compound selected from caryophyllene, eugenol, methyl chavicol, methyl cinnamate and p-cymene Insect control agent for grains and dry matter containing seeds or two or more kinds as active ingredients (Patent Document 6), nutmeg, anise star, sinamom , An insecticidal agent for cereals / dry matter containing lemongrass, an extract of cumin or essential oil or one or more of cumin aldehyde or 1,8-cineole as an active ingredient (Patent Document 7), green pepper as an active ingredient We propose the insect control agent for grains and dry matter contained (Patent Document 8) and the like.

  However, development of grain and dry matter insect repellents with better effects, superior safety, and usability is still important, and its promotion is required.

JP-A-6-38678 JP-A-11-222409 JP 2004-175745 A JP 2004-182704 JP-A-2005-82502 JP 2005-97165 A JP 2012-31105 Unexamined-Japanese-Patent No. 2013-249271

  Therefore, the present invention can be used in the general household, is safe, and develops an insect repellent having a strong insect repellent effect against cereals and dry matter pests as well as or more than conventional spices and plant components. Purpose.

  In order to solve the above-mentioned problems, the inventor of the present invention searched the insect repellent effect of plants for which no action against cereal pests has not been reported, and the burdock has excellent insect repellent efficacy against cereal pests. It has been found that the present invention has.

  That is, the present invention is an insect repellent for cereals / dry matter, which comprises burdock root or a processed product thereof as an active ingredient.

  The present invention is also a method of controlling insect pests, which comprises applying the above insect repellent agent to cereal pests.

  The insecticidal agent for cereals / dry matter according to the present invention is less irritating, irritating to mucous membranes and skin, is safe for the human body, and can be easily used in general homes. Therefore, the insect repellent according to the present invention exhibits excellent insect repellent effect against cereals and pests by being applied to a warehouse for storing or preserving grains, a household storage container, a household storage container, etc. Can protect grains and the like from food damage without losing the quality due to the migration of odor.

FIG. 1 is a schematic view of a test apparatus used for the insect control test of Example 1. It is the enlarged view which looked at the pipe 4 which comprises the test device of FIG. 1 from upper direction (arrow direction of FIG. 1). FIG. 7 is a schematic view of a test apparatus used for the insect control test of Examples 2 and 4. FIG. 7 is a view schematically showing a gel formation test in Example 5. In the figure, a is the position of the upper end of the prepared gel, and b is the position of the tip of the gel surface after 5 minutes of tilting the gel with the beaker side down.

  In the insect repellent of the present invention, the root part of burdock or a processed product thereof is used as the active ingredient.

  Burdock (Arctium lappa L.) used in the present invention is a plant of the family Asteraceae, and the type thereof is not particularly limited, and Takino River burdock, Oura burdock, Horikawa burdock, etc. can be used. It is preferable to use

  In the present invention, the burdock root can be used as it is in a raw state, but it can also be used in the form of a processed product. As processed products of burdock root, shredded product of shredded burdock root in a raw state (in a state not to be dried), crushed material, squeezed juice, dried product obtained by drying burdock root preferably to a water content of 10% or less The dry powder obtained by grinding the dry matter, and their essential oils and extracts are included. The burdock root may have its skin removed if necessary. Among these, it is more preferable to use a dry powder from the viewpoint of easiness of handling and effects. Moreover, since a compound useful for an insect repellent effect will decrease by heating when roasting, it is desirable to use an unroasted thing. Therefore, the drying temperature is also preferably 60 ° C. or less. A conventionally known method can be used as a method of obtaining an extract or an essential oil from the root part of burdock. For example, distillation methods such as steam distillation and vacuum distillation, compression methods, nitrogen extraction methods, carbon dioxide extraction, alcohols such as dimethyl ether, ethanol and methanol, and acetone, acetonitrile, diethyl ether, ethyl acetate, chloroform, methylene chloride and the like Examples include extraction methods such as solvent extraction using a polar organic solvent, and fat and oil adsorption methods.

  The content of the root portion of the burdock or the processed product thereof in the insect repellent agent of the present invention is not particularly limited. However, the shredded product, ground material, squeezed juice, root portion of burdock root in the raw state is dried. In the case of using the dried product and the dried powder obtained by grinding the dried product, it is 0.01% by mass (hereinafter simply referred to as "%") or more, preferably 0.1% or more, preferably 1. It is preferable to mix | blend 0% or more. On the other hand, the upper limit of the compounding amount is 100% or less, preferably 30% or less, more preferably 10% or less. If the blending amount is more than 30%, the smell of the root part of the burdock may be transferred to grains etc., or discoloration and offensive odor may occur in the root part of the burdock, which is not preferable from the viewpoint of product quality stability. On the other hand, when using those essential oils or extracts, the amount of the root part of the burdock as a raw material may be made into the quantity which becomes in the said range.

  The insect repellent of the present invention can be formulated according to a conventional method. The dosage form is not particularly limited, and examples thereof include a liquid, a gel, a solid, a fumigant, a heating and transpiration agent, a blast and transpiration agent, a spray, and an aerosol.

  In the case of a solution, it can be prepared by dissolving or dispersing the above-mentioned burdock root or its processed product in a suitable solvent, if necessary, using a surfactant.

Further, as a solvent which can be used for dissolving or dispersing the above root part of burdock or a processed product thereof, water and a suitable organic solvent such as hexane, heptane, octane, decane, straight chain hydrocarbon compounds such as paraffin, benzene, Aromatic hydrocarbon compounds such as toluene, xylene, ethylbenzene, cumene, cumene and styrene, terpene hydrocarbon compounds such as limonene, mentane, pinene and dipentene, methanol, ethanol, 1-propanol, 2-propanol, 1- Hydrocarbon alcohols such as butanol, 2-butanol, 2-methyl-1-propanol, 2-methyl-2-propanol, pentanol, hexanol, heptanol, octanol, nonanol, decanol, cis-3-hexenol, trans- 3-hexenol, Terpene alcohols such as narol and geraniol, aromatic alcohols such as allyl alcohol, benzyl alcohol and eugenol, chloroform, carbon tetrachloride, trichloroethane, tetrachloroethane, trichloroethylene, tetrachloroethylene, chlorobenzene, dichlorobenzene, trichlorobenzene, ethyl bromide, bromide Halogenated hydrocarbon compounds such as propyl, bromobenzene, dibromobenzene and fluorobenzene, phenolic compounds such as phenol, cresol and xylenol, diethyl ether, dipropyl ether, dibutyl ether, dibutyl ether, ethyl vinyl ether, anisole, phenetole, dibenzyl ether, Dioxane, trioxane, furan, cineole, diethylene glycol diethyl ether, acetal etc Ether compounds, ketone compounds such as acetone, methyl ethyl ketone, 2-hexanone and cyclohexanone, formic acid, acetic acid, propionic acid, butyric acid, valeric acid, fatty acids such as oleic acid and acetic anhydride, formic acid ester, acetic acid ester, propionic acid Ester, Butyric Acid Ester, Valeric Acid Ester, Heptyl Ester, Heptene Carboxylic Acid Ester, Octene Carboxylic Acid Ester, Laurate Ester, Myristic Acid Ester, Benzoic Acid Ester, Phenyl Acetic Acid Ester, Cinnamic Acid Ester, Phthalic Acid Ester, Salicylate Ester Ester compounds such as anisic ester, anthranilic ester, methylanthranilic ester, chrysanthemic acid ester, nitromethane, nitroethane, nitrobenzene, acetonitrile, methylamine, dimethylamine Compounds such as allylamine, aniline, N, N-dimethylaniline, toluidine, pyridine, quinoline, ethylenediamine, formamide, pyrrolidone, ε-caprolactam and the like, sulfur compounds such as carbon disulfide, dimethyl sulfide and thiophene, ethylene glycol and propylene glycol And glycol ether compounds such as 2-methoxyethanol, 2-ethoxyethanol, 2-phenoxyethanol, 3-methyl-3-methoxybutanol, and diethylene glycol monomethyl ether, sesame oil, linole oil, salad oil and the like. It is also possible to use one or more of these in combination. Among these, from the viewpoint of amount used, stability, effect and price, it is preferable to use a C _{1 to} C ₁₀ alcohol, particularly ethanol. The C _{1 to} C ₁₀ alcohol is preferably used because it has an insecticidal effect against cereal pests and fiber pests.

  The content of the solvent in the insect repellent agent of the present invention is preferably 1 to 99%, more preferably 10 to 99%, and still more preferably 50 to 90%.

  The surfactant which can be used is not particularly limited, and examples thereof include conventionally known surfactants such as cationic surfactants, anionic surfactants, amphoteric surfactants, and nonionic surfactants. . Among these, nonionic surfactants, in particular polyoxyethylene hydrogenated castor oil, are preferred in view of dissolution, dispersibility and gel shrinkability described later. 0.01-10% is preferable and, as for content of surfactant in the insect repellent of this invention, 0.1-5% is more preferable.

  The above-mentioned solution can be made solid or sheet-like solid agent by impregnating and supporting it on a suitable support. The carrier for supporting the liquid agent is not particularly limited, and examples thereof include wood, paper, cloth, non-woven fabric, silica, talc, activated carbon, silica gel, zeolite, cellulose beads, activated carbon, ceramic and the like.

  Furthermore, the above-mentioned liquid preparation can also be made into gelation using a gelling agent. In particular, when using the dried powder of the root part of burdock as an active ingredient, there is no risk of being scattered or falling off, for example, in the applicable grain storage container etc. by gelling, and also grain storage container It is suitable because the insect repellent component can be stably volatilized in the like. Furthermore, by visually observing the decrease in gel, it is possible to confirm the effect and to determine the end time of the effective period. Furthermore, by blending the above-mentioned surfactant, the gel can be shrunk evenly, and the visual judgment can be made more clearly.

  As a gelling agent used for gelling, any of conventionally known gelling agents can be used, and examples thereof include, for example, carrageenan, gellan gum, agar, gelatin, guar gum, pectin, locust bean gum, tamarind gum, xanthan gum, sodium alginate, cellulose Derivatives, highly water-absorbing resins such as hydroxypropylated polysaccharides, polyacrylic acid and sodium polyacrylate, dibenzylidene-D-sorbitol, fatty acid salts and the like can be mentioned. 0.05-20% is preferable and, as for content of the gelatinizer in the insect repellent of this invention, 0.1-10% is more preferable.

  Among them, hydroxypropylated polysaccharides, polyacrylic acid, sodium polyacrylate, dibenzylidene-D-sorbitol, and fatty acid salts are preferably used because of gel stability when ethanol is used as the solvent, and the like. More specifically, it is preferable to use hydroxypropylated guar gum.

  In the insect repellent agent of the present invention, pest control components other than burdock root or its processed product can be further blended.

  For example, as a grain and dry matter pest control component, pepper extract, horseradish extract, perilla extract, allicin, capsaicin, perilla aldehyde, thyme, cardamom, nutmeg, clove, coriander, caryophyllene, eugenol, methyl chavicol, methyl cinnamate, p- Simen, Sage, Rosemary, Basil, Caraway, Eucalyptus, Citronella, Anise, Orange, Anise Star, Cinnamon, Lemongrass, Cumin, Cuminaldehyde, 1,8-Cineole, Geraniol, Citronellol, Terpineol, Nerol, Fenquil Alcohol , Borneol, linalool, citronellal, cineole, fencyl acetate, terpinyl acetate, bonyl acetate, linalyl acetate, camphor, α-terpinene, Cymene, mention may be made of camphene, terpinolene, myrcene, limonene, alpha-pinene, a β- pinene terpene compounds. Among these, cumin aldehyde, 1,8-cineole and the like are suitably used.

ただし、式（Ｉ）中、Ｒ_１は水素、炭素数１〜４のアルキル基またはアセチル基を示し、好ましくは水素または炭素数１〜４のアルキル基である。また、式（Ｉ）中、Ｒ_２は水素、炭素数１〜４のアルキル基、炭素数１〜４のアルコキシ基またはメチルチオ基を示し、好ましくは炭素数１〜４のアルコキシ基またメチルチオ基である。更に、式（Ｉ）中、Ｒ_３は水素、炭素数１〜４のアルキル基またはビニル基を示し、好ましくは水素である。また更に、式（Ｉ）中、Ｒ_４は水素または炭素数１〜４のアルキル基を示し、好ましくは水素である。 Moreover, the pyrazine type-compound represented by following formula (I) can also be used suitably as a grain and dry matter pest control component.

However, in Formula (I), R ₁ represents hydrogen, an alkyl group or an acetyl group having 1 to 4 carbon atoms, preferably hydrogen or an alkyl group having 1 to 4 carbon atoms. In the formula (I), R ₂ represents hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, or a methylthio group, preferably an alkoxy group having 1 to 4 carbon atoms or a methylthio group is there. Furthermore, in the formula (I), R ₃ represents hydrogen, an alkyl group having 1 to 4 carbon atoms or a vinyl group, preferably hydrogen. Furthermore, in the formula (I), R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms, preferably hydrogen.

  Among pyrazine compounds represented by the above formula (I), preferred are pyrazine, 2-methylpyrazine, 2,3-dimethylpyrazine, 2,5-dimethylpyrazine, 2,6-dimethylpyrazine, 2- Ethylpyrazine, 2-ethyl-3-methylpyrazine, 2-ethyl-5-methylpyrazine, 2-n-propylpyrazine, 2,3,5-trimethylpyrazine, 2-methyl-5-vinylpyrazine, 2-t- Butylpyrazine, 2,3-diethylpyrazine, 5-ethyl-2,3-dimethylpyrazine, 2-ethyl-3,5-dimethylpyrazine, 2-methyl-3-propylpyrazine, 2,3,5,6-tetra Methylpyrazine, 2-butyl-3-methylpyrazine, 2,3-diethyl-5-methylpyrazine, 2-methoxypyrazine, 2-ethoxypyrazine, 2-methane Xyl-3-methylpyrazine, 2-methylthio-3-methylpyrazine, 2-ethoxy-3-methylpyrazine, 2-methyl-3-isopropoxypyrazine, 2-ethoxy-3-ethylpyrazine, 2-isopropyl-3- Methoxypyrazine, 2-ethoxy-3-isopropylpyrazine, 2-isobutyl-3-methoxypyrazine, 2-sec-butyl-3-methoxypyrazine, 2-acetylpyrazine, 2-acetyl-3-methylpyrazine, 2-acetyl- 3-ethylpyrazine, 2-methoxy-3-propylpyrazine, 2-isobutyl-3-methoxypyrazine, 2-isoamyl-methoxypyrazine and the like. Among these, 2-methoxy-3-methylpyrazine, 2-isopropyl-3-methoxypyrazine, 2-methoxy-3-propylpyrazine, 2-sec-butyl-3-methoxypyrazine, 2-isobutyl-3-methoxy Pyrazine, 2-butyl-3-methoxypyrazine, 2-isoamyl-methoxypyrazine and the like are components contained in the root of burdock and are preferably used because they exhibit excellent insect repellent effects against cereal pests.

  Although the compounding quantity of pest control components other than the root part of the burdock root in the insect repellent agent or its processed product is not specifically limited, about 0.01 to 30% is preferable, and 0.1 to 10% is more preferable.

  The insect repellent agent of the present invention can also contain other optional components as needed. Examples of other optional components include, for example, perfumes, deodorants, fungicides, dyes, pigments, antioxidants, UV absorbers and the like.

  The above-mentioned liquid agent, gelling agent and solid agent may be placed in a container made of plastic, paper, pottery, metal or the like.

  In the case where the insect repellent preparation form is a fumigant, for example, the container of the upper opening is an azo compound such as azodicarbonamide, an organic foaming agent such as a nitroso compound or a hydrazide compound, the above solid agent and gelling agent The storage chamber storing the storage unit may be combined with a heating means such as a heater for heating the storage chamber at the bottom of the storage chamber. Such a fumigant is disclosed, for example, in Japanese Utility Model Application Publication No. 54-148267 and the like, and this may be referred to.

  In addition, when the agent type is a heating and transpiration agent, for example, it may be a combination of a chemical bottle filled with the above-mentioned liquid with a suction core and heating means such as a heater for heating the upper portion of the suction core. What impregnated the above-mentioned liquid agent in a mat-like impregnated body may be combined with a heating means such as a heater for heating the mat. These heating and transpiration agents are disclosed, for example, in Japanese Utility Model Application Laid-Open Nos. 2-78077 and the like, and Japanese Utility Model Laid-Open No. 1-116072 and the like, and these may be referred to.

  Furthermore, in the case where the agent type is a blast and transpiration agent, for example, the above-described solution may be impregnated and held in the above-described carrier, and a blast unit such as a fan may be combined. Such a blast and transpiration agent is disclosed in, for example, Japanese Patent Application Laid-Open No. 11-308955, and this may be referred to.

  Furthermore, in the case where the insect repellent agent is used as a spray, the above-mentioned solution may be combined with a spray means such as a trigger spray or an atomizer.

The insect repellent of the present invention obtained as described above can be effectively repellent by applying it to pests. In the present invention, “insect” is a concept including the following actions.
(1) egg-laying inhibitory effect to inhibit the spawning of pests (2) hatching inhibiting action to suppress hatching of pest eggs (3) insecticidal action of young larvae to kill hatched juvenile larvae (4) pest Repellent action to repel (5) Insecticidal action to kill pests (6) Growth inhibitory action to suppress the growth of pests The insect repellent agent of the present invention is particularly excellent in the repellant action among these.

  The pests to be repellent by the insect repellent agent of the present invention are not particularly limited, but, for example, weak beetles of the Coleoptera occidentalis family, Coccoid weevil, Granaria cocculent weeds, etc. Nomen's cocoon moth, moths, moths, etc., coleoptera moth moths, etc., coleopod moths, coleoptera moths, coleoptera moths, coleoptera moths, etc There can be mentioned many grain pests such as sawdust, etc., and codice moths such as Konanagashinbi of the family Coleoptera nagasaishi. When it is set as the insect repellent agent for such a grain and dry matter pest, the insect repellent effect can be heightened by mix | blending the grain and dry matter pest control component mentioned above.

  Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited in any way by the examples.

Example 1
The root of burdock root (various mixed varieties of Isuke et al. Contained in Takino River burdock seed) is collected and dried to a water content of 10% or less at a temperature of 60 ° C., and then a burdock powder with a particle size of 40 mesh pass using a Makino crusher It was created.

  The burdock powder was used as the product 1 of the present invention, and using the test apparatus shown in FIG. 1 and FIG. As a comparative product, a red pepper powder (comparative product 1) was used, which was dried to a moisture of 15% or less at a temperature of 105 ° C. and then crushed to a particle size of 24 mesh using a stamp crusher.

<Test equipment>
As shown in FIG. 1, the test apparatus 1 includes a test pipe 2 (control cylinder diameter 12 mm × length 50 mm) and a test section 2 and a control section 3 (each having an inner diameter of about 85 mm and a depth of 110 mm and a 570 ml capacity polypropylene cylindrical container). And 3 mm thick), so that the test pest can freely travel between the two zones. Also, in the test area 2 of this test apparatus, a petri dish 5 having a diameter of 4.6 cm and a petri dish 6 having a diameter of 4.6 cm are in the control area 3, and a petri dish 5 having the same shape as that in the test area 2 is installed. Each is installed. Furthermore, as shown in FIG. 2, an air hole 7 of size 30 mm × 20 mm (covered with nylon mesh and can not pass through the test pest) is formed in the upper portion of the passage pipe 4 of the test device 1. It is made for the insect repellent which volatilized in the area | region 2 not to be transmitted to the control area 3 along the passage pipe 4.

<Insect test method>
In the insect repellent test using the test apparatus described above, first, open the lid 8 of each of the test section 2 and the control section 3 and put 1.0 g of brown rice (Akitakomachi) as a grain in each petri dish 5 and install it at the position shown in FIG. did. Next, 0.1 g of a test substance (dried powder of burdock or red pepper) was placed in a petri dish 6 and placed in test area 2. Then, a total of 20 adult insects of the target insect pest, that is, weevil insects, were placed in the test zone 2 and the control zone 3, respectively.

  Thereafter, the lids 8 of both sections were closed, and the test apparatus 1 was allowed to stand at 25 ° C. and left for 48 hours. After standing, the numbers of adults present in Test Zone 2 and Control Zone 3 were counted, respectively, and the ratio of adults present in Control Zone 3 to the total number of input adults (repelled rate) was calculated according to the following equation. In addition, the effectiveness factor is also shown, where the condition in which the specimen does not repel or attract at all (repulsion ratio 50%) is 0, and the condition in which the specimen completely excludes adults (repulsion ratio 100%) is 1 The As a control, nothing was put in the petri dish 6, and the same test as described above was performed. The results are shown in Table 1.

  As a result, it was found that the product 1 of the present invention using burdock exhibits a pest repellent effect clearly higher than the comparative product 1 using red pepper.

Example 2
According to the formulation in Table 2, a gel-like insect repellent composition (Inventive product 2) was prepared by the following method.
That is, hydroxypropylated to 10 g of ethanol mixed with 1.0 g of burdock fine powder (particle size 40 mesh pass) ground with a Makino grinder, 1.0 g of surfactant and 0.01 g of pigment, 10 g of guar gum dissolved in 70 g of ethanol was added, and after stirring, water was added to make it 100 g and filled in a container of 35 mm long × 35 mm wide × 75 mm high. The mixture was allowed to stand for 3 hours to obtain a gel-like grain pest repellent agent of the product 2 of the present invention.

  0.1 g of the obtained insecticidal agent for gel-like grains of the present invention product 2 was evaluated using the test apparatus 1 'shown in FIG. That is, instead of the petri dish 6 installed in the test section 2, a spherical worm cage 6 'having a diameter of 4 cm is used, and the insecticidal agent for gel grain / dry matter pest of the present invention 2 is put therein, and 2 petri dishes An evasion test was conducted using the same apparatus as in Example 1 except that 1.0 g of brown rice (Akitakomachi) was added as a grain to No. 5. The test method was also the same as in Example 1 except that it was left to stand at room temperature 25 ° C. and left for 2 hours, and then the repelling rate and the coefficient of effectiveness were calculated in the same manner as in Example 1. The results are shown in Table 3.

  As a result, it was found that the insect repellent of the product 2 of the present invention exhibited an excellent pest repellent effect.

Example 3
Thirty grams of the insecticidal agent for gel-like grains of the present invention 2 is placed in a cylindrical container (diameter 40 mm and height 80 mm) with an open top, and rice is stored for about 16 liters (300 mm × 185 mm × 300 mm) in volume containing 5 kg of rice. It was placed in a container and stored at room temperature 25 ° C. As a result, the insect repellent effect was exhibited for 4 months in the cylindrical container. After six months, the gel shrunk in a similar shape to the cylindrical container, and the end point of the drug efficacy could be clearly determined.

Example 4
Wash the burdock (Takinogawa burdock) with water, immerse 20 g of burdock slice (thickness 2 mm or less) with the outer shell in 95 degrees fermented alcohol at room temperature for 4 days, and filter the immersion liquid with a coffee filter Thus, a burdock extract (present invention 3) was prepared.

  Next, 50 μl of the obtained burdock extract of the product 3 of the present invention 3 was evaluated using the test apparatus 1 'shown in FIG. That is, the repellent test was carried out using the same apparatus as in Example 2 except that the test object (a 17 mm × 25 mm paper impregnated with 50 μl of the burdock extract of the present invention 3) was put in the spherical worm cage 6 ′. The The test method was also carried out in the same manner as in Example 2 except that it was left to stand at room temperature 25 ° C. and left to stand for 3 hours, and then the repelling rate and the effectiveness factor were calculated in the same manner. The results are shown in Table 4.

  As a result, it was found that the product 3 of the present invention using burdock extract exhibits an excellent pest repellent effect.

Example 5
According to the formulation shown in Table 5, gel compositions of a gel-like insect repellent composition (Inventive product 4) and Comparative product 2 were prepared by the following method at room temperature.
That is, 1.0 g of burdock fine powder (particle size 40 mesh pass) pulverized with a Makino crusher, 1.0 g of hydroxypropyl guar gum dissolved in 79 g of ethanol was added to 6.7 g of ethanol, and after stirring, water was added. In addition, 50 g of the one made into 100 g was filled in a 100 ml beaker to obtain the product 4 of the present invention.
As a comparative product, 10 g of hydroxypropylated guar gum was dissolved in 80 g of ethanol, and after stirring, water was added to make 100 g of which 50 g was filled in a 100 ml beaker (Comparative product 2).

<Gel formation test>
The gel migration distance was measured as shown in FIG. 4 with respect to the beaker kept at room temperature for 20 minutes after being filled with the product 4 of the present invention and the comparative product 2, and the gel formation was evaluated from this value. That is, from the position of the upper end of the prepared gel (a in the figure), the distance between the position of the tip of the gel surface (b in the figure) and 5 minutes after the gel was turned over sideways with the beaker (moving distance) Was measured and evaluated according to the following criteria. The results are shown in Table 6.
(Standard)
;; Travel distance in 5 minutes sideways less than 10 mm ○; Travel distance in 5 minutes side down 10 to 40 mm
Travel distance of over 40 mm in 5 minutes sideways

Further, when the product 4 of the present invention was used as a gel-like grain pest repellent, it exhibited excellent insect repellent efficacy.
As a result, the insect repellent agent of the product 4 of the present invention not only exhibits excellent insect repellent effect, but also shows higher gel formation than the comparative product 2 which did not use the burdock powder, and has excellent properties for preparation and use. It turned out to have.

  The insect repellent according to the present invention exhibits an excellent repellent effect and the like against pests which damage cereals and the like. And since this insect repellent is used for food as a raw material, it is safe for the human body and has low irritation to mucous membranes and skin, and can be easily used in general homes.

1 · · · Test apparatus 2 · · · Test section 3 · · · Control section 4 · · · Aisle pipe 5 · · · Petri dish 6 · · · Petri dish 6 6 · · · Insect cage 7 · · ... Air hole 8 ... ... lid

Claims (8)

  An insect repellent agent for grain and dry matter pests, which comprises a burdock root or a processed product thereof as an active ingredient.   The insecticidal agent for cereals / dry matter according to claim 1, wherein the processed product of the root portion of burdock is a dried powder of the root portion of burdock.   The insecticidal agent for grains and dry matter according to claim 1 or 2, further comprising a gelling agent and being gelled.   4. The method according to claim 3, wherein the gelling agent is one or more selected from the group consisting of hydroxypropylated polysaccharides, polyacrylic acid, sodium polyacrylate, dibenzylidene-D-sorbitol and fatty acid salts. Insect repellent for grains and dry matter.   The insecticidal agent for cereals / dry matter according to any one of claims 1 to 4, further comprising a cereal / dry matter pest control component (excluding the roots of burdock or a processed product thereof).   Cereal and dry matter pest control components are red pepper extract, horseradish extract, perilla extract, allicin, capsaicin, perilla aldehyde, thyme, cardamom, nutmeg, clove, coriander, caryophyllene, eugenol, methyl chavicol, methyl cinnamate, p-simen, sage , Rosemary, basil, caraway, eucalyptus, citronella, anise, orange, anise star, cinnamon, lemon grass, cumin, cumin aldehyde, 1,8-cineole, pyrazine compounds and terpene compounds The insecticidal agent for cereals / dry matter according to claim 5, which is one or two or more of them. A method for controlling grain and dry matter pests comprising applying the grain and dry matter insect repellant according to any one of claims 1 to 6 to grain and dry matter pests.   An insect repellent method for cereals / dry matter pest, which comprises applying the insect repellent according to any one of claims 1 to 6 in a cereal / dry matter storage container.

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