JP5128087B2 - Mixed granular pesticide composition - Google Patents

Description

  The present invention relates to a mixed granular agrochemical composition. More specifically, the present invention relates to a mixed granular pesticidal composition comprising two granular compositions, particularly suitable for rice pest control.

  Patent Document 1 discloses a sustained-release pesticidal granule capable of controlling the elution of a highly water-soluble pesticidal active ingredient, polyvinyl alcohol as a binder constituting the granule, and hydrophobic fine powder. Calcium stearate is mentioned.

  U.S. Patent No. 6,057,033 discloses a mixture of pest control granules that remain uniform when stored, handled and formulated.

  Patent Document 3 discloses a granular pesticide composition comprising a plurality of types of granular solid agents that hardly cause segregation due to factors such as vibration and impact during transportation and handling, and that can maintain uniformity.

The application of a seedling box for agricultural chemicals is the simplest method in terms of labor saving, but depending on the type of the agricultural chemical active ingredient, there is a risk of causing phytotoxicity to young seedlings. While pursuing labor saving, providing a pesticide formulation that eliminates this risk is extremely important in maintaining a pest control system after Honda transplantation by applying nursery boxes.
JP-A-2-286602 Japanese National Patent Publication No. 11-508260 JP 2000-86405 A

  As a result of the examination, when the following specific mixed granular agricultural chemical composition is applied within an arbitrary period from the time of sowing to just before transplantation in a seedling box, without causing any phytotoxicity, Honda transplantation It has been found that pests of later crops, particularly pests, can be accurately controlled, and the present invention has been completed.

  Thus, the present invention relates to a granular composition (a) obtained by coating a nucleus with a mixed composition containing a pesticidal active compound, a binder and optionally an agrochemical adjuvant, a pesticidal active compound, and a polymer. A granular composition (b) comprising a resin, a hydrophobic substance, talc and, optionally, a mixed composition containing an agrochemical adjuvant, coated with a nucleus, or a pest control active compound, a polymer resin, a hydrophobic substance, talc, The present invention provides a mixed granular pesticidal composition comprising a granular composition (c) formed by coating grain nuclei with a mixed composition containing a water-soluble substance and optionally an agrochemical auxiliary.

  According to the present invention, when the mixed granular agricultural chemical composition of the present invention is applied to a nursery box, the pest control active compound (hereinafter referred to as an active ingredient) elutes from the granular composition (a) at a normal rate, On the other hand, the active ingredient is gradually eluted from the granular composition (b) or (c), and the elution amount of the active ingredient from these two kinds of granular compositions is a threshold necessary for controlling pests after transplanting the crop to Honda. Therefore, it is possible to accurately control crop pests. Moreover, since the integrated value of the elution amount of the active ingredient gradually increases as described above, the mixed granular agricultural chemical composition of the present invention can be used safely even for young seedlings.

  Such an accurate and excellent mechanism of action of the mixed granular pesticidal composition of the present invention is quite remarkable, which is completely unexpected from the prior art.

  Pest control active compounds used as active ingredients in the mixed agricultural chemical granular composition of the present invention include active compounds usually used in the control of pests on crops, particularly pests, such as imidacloprid, thiacloprid, clothianidin, thiamethoxam, nitenpyram , Dinotefuran, neonicotinoid insecticidal compounds represented by acetamiprid; fipronil, carpropamide, diclocimet, tricyclazole, pyroxylone, probenazole, tifluzamide, spinosad, emamectin benzoic acid, 2'-cyano-3,4-dichloro-isothiazole-5 -Carboxyanilide, orysastrobin, thiazinyl and the like can be exemplified. These active compounds can be used alone or in combination of two or more.

  Also, the pesticidal active compound contained in the granular composition (a) and the pesticidal active compound contained in the granular composition (b) or (c) can be the same, but in some cases they are different from each other. May be.

  The total content of the pesticidal active compound in the mixed granular pesticidal composition of the present invention is not particularly limited and can be varied over a wide range depending on the type and application of the active compound. A range of 0.5 to 10%, particularly 1 to 5% based on the weight of the agricultural chemical composition is preferred.

  In addition, the relative proportion of the pest control active compound contained in each of the granular composition (a) and the granular composition (b) or (c) in the mixed granular agrochemical composition of the present invention is also strictly limited. However, it can be changed according to the type and properties of the active compound, the type of pests to be controlled and the state of occurrence, etc., but generally, the pest control active compound in the mixed granular composition of the present invention The granular composition (a) contains about 1/15 to about 1/2, preferably about 1/8 to about 1/4 of the total content, and the remaining amount is stored in the granular composition (b) or (c ) Can be contained.

  Examples of the binder used in the granular composition (a) include polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, dextrin, sodium alginate and the like, and polyvinyl alcohol is particularly preferable.

  Examples of the polymer resin used in the granular composition (b) or (c) include a urethane resin, preferably a water-based urethane resin. As typical examples, Superflex 820 (Daiichi Kogyo Seiyaku Co., Ltd.), Super Examples include Flex 160 (same as above), Bondick 2220 (manufactured by Dainippon Ink & Chemicals, Inc.), Hydran AP-20 (same as above), and the like.

Examples of the hydrophobic substance used in the granular composition (b) or (c) include calcium stearate, magnesium stearate, and aluminum stearate, and preferably calcium stearate.
Examples of the water-soluble substance used in the granular composition (c) include potassium sulfate, magnesium sulfate, sodium sulfate, sodium chloride, potassium chloride, calcium chloride, urea, ammonium sulfate, and saccharides, preferably sulfuric acid. Mention may be made of potassium.

  Examples of the agrochemical adjuvant that can be included in the granular composition (a) and / or (b) and / or (c) include surfactants, solid diluents, colorants and the like.

  Examples of the surfactant include lignin sulfonate, alkyl phosphate, fatty acid salt, alkyl sulfonate, alkyl benzene sulfonate, alkyl naphthalene sulfonate, naphthalene sulfonate formalin condensate, and polyoxyalkylene alkyl ether sulfate. Salt, polyoxyalkylene alkyl phenyl ether sulfate, polyoxyalkylene tristyryl phenyl ether sulfate, polyoxyethylene-polyoxypropylene block polymer sulfate, dialkyl sulfosuccinate, polyoxyalkylene alkyl ether sulfosuccinate salt, polyoxy Anionic surfactants such as alkylene alkyl phenyl ether phosphate salts; polyoxyalkylene alkyl phenyl ether, polyoxyalkylene fatty acid ester , Polyoxyalkylene tristyryl phenyl ether, polyoxyalkylene alkylamine, sorbitan fatty acid ester, sucrose fatty acid ester, polyoxyalkylene sorbitan ester, glycerin fatty acid ester, polyoxyethylene-polyoxypropylene block polymer, polyoxyethylene-polyoxy Nonionic surfactants such as propylene block polymer alkylphenyl ethers; amphoteric surfactants such as aliphatic alkylbetaines and alkylammonium salts; cationic surfactants such as alkylpyridinium salts and polyethylene polyamine fatty acid amides .

  Examples of the solid diluent include mineral substances such as clay, pumice fine powder, calcined diatomaceous earth, kaolin, talc, acid clay, and calcium carbonate.

  Examples of the colorant include inorganic pigments (eg, iron oxide, titanium oxide, Prussian blue), organic dyes (eg, alizarin dyes, azo dyes, metal phthalocyanine dyes), trace elements (eg, iron, manganese, boron) , Copper, cobalt, molybdenum, zinc, etc., or salts thereof).

  Further, white carbon or the like can be used as an agrochemical auxiliary other than those exemplified above.

  On the other hand, examples of the grain nuclei used in the granular compositions (a), (b), and (c) include calcium carbonate-containing granular materials such as limestone and marble, quartz sand, pumice, clay grains, and granulated inorganic substance grains. Etc., preferably silica sand. Here, the silica sand may have a particle size in the range of about 300 μm to about 1700 μm, preferably 500 μm to 1400 μm.

  The granular composition (a) is prepared by, for example, spraying a binder dissolved in an appropriate amount of water onto silica sand, and uniformly moistening the mixture with a raw material composed of a pest control active compound, white carbon and clay. It can be produced by adding the powder composition, coating the silica sand with stirring and mixing, and then drying.

  The granular composition (b) is prepared by, for example, spraying a water-based urethane resin dispersed in an appropriate amount of water onto silica sand, stirring to uniformly wet the mixture, and adding the same bulk powder composition to the above. After coating the silica sand with stirring and drying, the primary particles thus prepared are further sprayed with an aqueous urethane resin dispersed in an appropriate amount of water, and uniformly moistened with stirring. Can be produced by adding a mixture of talc and calcium stearate to the mixture and stirring and mixing.

  The granular composition (c) can be produced, for example, by adding potassium sulfate, which is a water-soluble substance, to a mixture of talc and calcium stearate and in the same manner as in the production method of the granular composition (b).

  The mixing ratio of the granular composition (a) and the granular composition (b) or (c) in the mixed granular agrochemical composition of the present invention is generally in the range of 2/3 to 3/2, preferably 1: 1. can do.

  The mixed granular pesticidal composition of the present invention is useful for application to crops, particularly paddy rice seedling boxes. For example, the mixed granular pesticide composition of the present invention can be applied to a seedling box within an arbitrary period from the time of sowing rice to immediately before transplanting, whereby the crop after the transplantation of Honda can be applied to pests, particularly pests. Can be protected from.

  The application amount of the mixed granular agricultural chemical composition of the present invention to the nursery box is not particularly limited, and can be changed according to the type of the agricultural chemical composition, the type of pests, and the like.

  EXAMPLES Next, although an Example demonstrates this invention further more concretely, this invention is not limited only to these Examples.

Formulation Example 1
Granular composition (a-1)
Imidacloprid (purity 98%) 0.52% by weight
White carbon 0.052% by weight
Clay 0.148% by weight
Polyvinyl alcohol 0.05% by weight
Silica sand 99.23 wt%
Using said component, it prepares according to the manufacturing method of above described granular composition (a), and obtains granular composition (a-1).

Granular composition (b-1)
Imidacloprid (purity 98%) 3.64% by weight
White carbon 0.364% by weight
Clay 1.026 wt%
Water-based urethane resin (Superflex 820) 3.3 wt%
Talc 1.25% by weight
Calcium stearate 11.25% by weight
Silica sand 79.17% by weight
Using said component, it prepares according to the manufacturing method of an above described granular composition (b), and obtains a granular composition (b-1).

  The said granular composition (a-1) and (b-1) are mix | blended in the ratio of 1: 1 (weight), and the mixed granular agrochemical composition of this invention is obtained.

Formulation Example 2
Granular composition (a-2)
Imidacloprid (purity 98%) 1.04% by weight
White carbon 0.104% by weight
Clay 0.296 wt%
Polyvinyl alcohol 0.05% by weight
Silica sand 98.51 wt%
Using said component, it prepares according to the manufacturing method of above described granular composition (a), and obtains granular composition (a-2).

Granular composition (b-2)
Imidacloprid (purity 98%) 3.12% by weight
White carbon 0.312% by weight
Clay 0.878% by weight
Water-based urethane resin (Superflex 820) 3.3 wt%
Talc 1.25% by weight
Calcium stearate 11.25% by weight
Silica sand 79.89 wt%
Using said component, it prepares according to the manufacturing method of an above described granular composition (b), and obtains a granular composition (b-2).

  The said granular composition (a-2) and (b-2) are mix | blended in the ratio of 1: 1 (weight), and the mixed granular agrochemical composition of this invention is obtained.

Formulation Example 3
Granular composition (a-3)
Imidacloprid (purity 98%) 2.07% by weight
White carbon 0.207% by weight
0.593 wt% clay
Polyvinyl alcohol 0.05% by weight
Silica sand 97.08% by weight
Using said component, it prepares according to the manufacturing method of an above described granular composition (a), and obtains a granular composition (a-3).

Granular composition (b-3)
Imidacloprid (purity 98%) 2.07% by weight
White carbon 0.207% by weight
0.593 wt% clay
Water-based urethane resin (Superflex 820) 3.3 wt%
Talc 1.25% by weight
Calcium stearate 11.25% by weight
Silica sand 81.33 wt%
Using said component, it prepares according to the manufacturing method of an above described granular composition (b), and obtains a granular composition (b-3).

  The said granular composition (a-3) and (b-3) are mix | blended in the ratio of 1: 1 (weight), and the mixed granular agrochemical composition of this invention is obtained.

Formulation Example 4
Granular composition (a-4)
Imidacloprid (purity 98%) 0.41% by weight
White carbon 0.041% by weight
Clay 0.119 wt%
Polyvinyl alcohol 0.05% by weight
Silica sand 99.38% by weight
Using said component, it prepares according to the manufacturing method of above described granular composition (a), and obtains granular composition (a-4).

Granular composition (b-4)
Imidacloprid (purity 98%) 3.74% by weight
White carbon 0.374% by weight
Clay 1.056 wt%
Water-based urethane resin (Superflex 820) 3.3 wt%
Talc 1.25% by weight
Calcium stearate 11.25% by weight
Silica sand 79.03 wt%
Using said component, it prepares according to the manufacturing method of an above described granular composition (b), and obtains a granular composition (b-4).

  The said granular composition (a-4) and (b-4) are mix | blended in the ratio of 1: 1 (weight), and the mixed granular agrochemical composition of this invention is obtained.

Formulation Example 5
Granular composition (a-1)
Same as those described in Formulation Example 1.

Granular composition (c-1)
Imidacloprid (purity 98%) 3.64% by weight
White carbon 0.364% by weight
Clay 11.026% by weight
Water-based urethane resin (Superflex 820) 5.85% by weight
Talc 2.00% by weight
Calcium stearate 14.0% by weight
Potassium sulfate 4.00% by weight
Silica sand 59.12% by weight
Using said component, it prepares according to the manufacturing method of an above described granular composition (c), and obtains a granular composition (c-1).

  The said granular composition (a-1) and (c-1) are mix | blended in the ratio of 1: 1 (weight), and the mixed granular agrochemical composition of this invention is obtained.

Formulation Example 6
Granular composition (a-2)
Same as those described in Formulation Example 2.

Granular composition (c-2)
Imidacloprid (purity 98%) 3.12% by weight
White carbon 0.312% by weight
Clay 10.878% by weight
Water-based urethane resin (Superflex 820) 5.85% by weight
Talc 2.00% by weight
Calcium stearate 14.0% by weight
Potassium sulfate 4.00% by weight
Silica sand 59.84% by weight
Using said component, it prepares according to the manufacturing method of above described granular composition (c), and obtains granular composition (c-2).

  The said granular composition (a-2) and (c-2) are mix | blended in the ratio of 1: 1 (weight), and the mixed granular agrochemical composition of this invention is obtained.

Formulation Example 7
Granular composition (a-3)
Same as those described in Formulation Example 3.

Granular composition (c-3)
Imidacloprid (purity 98%) 2.07% by weight
White carbon 0.207% by weight
Clay 10.593% by weight
Water-based urethane resin (Superflex 820) 5.85% by weight
Talc 2.00% by weight
Calcium stearate 14.0% by weight
Potassium sulfate 4.00% by weight
Silica sand 61.28% by weight
Using said component, it prepares according to the manufacturing method of an above described granular composition (c), and obtains a granular composition (c-3).

  The said granular composition (a-3) and (c-3) are mix | blended in the ratio of 1: 1 (weight), and the mixed granular agrochemical composition of this invention is obtained.

Formulation Example 8
Granular composition (a-4)
Same as those described in Formulation Example 4.

Granular composition (c-4)
Imidacloprid (purity 98%) 3.74% by weight
White carbon 0.374% by weight
Clay 11.056% by weight
Water-based urethane resin (Superflex 820) 5.85% by weight
Talc 2.00% by weight
Calcium stearate 14.0% by weight
Potassium sulfate 4.00% by weight
Silica sand 58.98% by weight
Using said component, it prepares according to the manufacturing method of above described granular composition (c), and obtains granular composition (c-4).

  The said granular composition (a-4) and (c-4) are mix | blended in the ratio of 1: 1 (weight), and the mixed granular agrochemical composition of this invention is obtained.

Test Example 1: 1500 ml of water was placed in a dissolution test pot (19 × 28 × 8 cm). 75 mg of each of the granular compositions (a-1) and (b-1) prepared in Formulation Example 1 was weighed and placed in a pot. A portion of the water was collected 1, 2, 3, 5, 7, 9, 11, 14, 17, 21, 24, 28, 31 days after input, and the concentration of imidacloprid eluted by high performance liquid chromatography was measured. . The results are shown in Table 1.

Test Example 2: Dissolution Test Using the granular compositions (a-2) and (b-2) prepared in Formulation Example 2, a dissolution test was performed in the same manner as in Test Example 1. The results are shown in Table 2.

Test Example 3: Biological effect test (control effect and phytotoxicity against rice weevil)
Test preparation A: Mixed granular pesticidal composition obtained in Preparation Example 2 B: Mixed granular pesticidal composition obtained in Preparation Example 1 Control: Commercial imidacloprid box granule (2%)
Method Using a seeder (THS-2205, manufactured by Tintec), soil (golden seedling containing zeolite 2.5 L / box) was uniformly packed into a seedling box for paddy rice (inner frame 28 cm × 58 cm × 3 cm) to form floor soil. . 180 g of rice straw (variety: Koshihikari) was uniformly sown per box and irrigated (0.8 L / box). The sowing surface was treated with the test preparation and covered with the same soil as the floor soil (1.2 L / box). The seedling box treated with chemicals was kept for 3 days in a seedling machine (30 ° C.) for germination, and was then raised in a greenhouse.

  In addition, about the control imidacloprid box granule (2%), in order to investigate the control effect with respect to rice weevil, a seedling not treated with a drug was prepared separately from the above seedlings, and treated at the time of transplantation.

  The phytotoxicity was evaluated on the following criteria by examining the germination status on the 3rd day after the drug treatment, and on the 7th, 10th and 14th days after the drug treatment with the naked eye.

  The effect on rice weevil was evaluated on the 14th, 22nd, and 29th days after rice planting by investigating 100 adult insects per ward, and evaluating each strain according to the following 6 levels. Based on the evaluation, the control value was calculated by comparison with the untreated section.

Criteria for evaluating chemical damage-: No chemical damage.
±: Slight phytotoxicity is observed.
+: Although phytotoxicity is clearly observed, growth is not affected.
++: Obvious phytotoxicity is observed, and growth is also affected.
++++: Significant growth inhibition was observed and withered.

Criteria for eating damage (damaged by rice weevil) 0: No eating damage.
1: 1-2 traces of food damage are observed per strain.
2: 3 to 6 food damage marks are observed per strain.
3: Some food damage marks are connected, and about 3 to 5 are recognized per strain.
4: Several food damage marks are connected, and about 10 are recognized per strain.
5: Connected food damage marks are seen on the entire leaves of the strain, and the entire strain looks white due to the food damage.

Damage level calculation method Damage level = [(0 × N0 + 1 × N1 + 2 × N2 + 4 × N3 + 8 × N4 + 12 × N5)
/ 12 × (N0 + N1 + N2 + N3 + N4 + N5)] × 100
N0: the number of strains with 0 damage, N1: the number of strains with 1 damage, N2: the number of strains with damage 2
N3: Number of strains of food damage 3; N4: Number of strains of food damage 4; N5: Number of strains of food damage 5

Control Value Calculation Method Control Value% = [(Non-treatment damage degree−Damage degree of treatment area) / Non-treatment damage degree] × 100

  The results are shown in Tables 3 and 4.

Claims (9)

A granular composition (a) comprising a nuclei coated with a mixed composition containing a pest control active compound, polyvinyl alcohol as a binder and optionally an agrochemical adjuvant;
Pest control active compound, granular composition (b) formed by coating the nucleus with a mixed composition containing a water-based urethane resin as a polymer resin, a hydrophobic substance, talc and optionally an agrochemical adjuvant, or pest control activity A granular composition (c) comprising a compound, a water-based urethane resin as a polymer resin, a hydrophobic substance, talc, a potassium sulfate as a water-soluble substance, and optionally a mixed composition containing an agrochemical auxiliary agent, covering the grain core formation is, then applied to nursery box within any period from the seeding of the crop until just before transplantation, for controlling pests after Honda transplantation, mixed granular pesticidal composition. The mixed granular agricultural chemical composition according to claim 1, wherein the pesticidal active compound is a neonicotinoid insecticidal compound selected from imidacloprid, thiacloprid, clothianidin, thiamethoxam, nitenpyram, dinotefuran and acetamiprid. The mixed granular agricultural chemical composition according to claim 1 or 2 , wherein the hydrophobic substance is calcium stearate and the grain core is silica sand. The particulate composition (a) contains about 1/15 to about 1/2 of the total content of the pesticidal active compound, and the particulate composition (b) or (c) contains the remaining amount. The mixed granular agricultural chemical composition according to 1, 2 or 3 . The mixed granular pesticide according to claim 4, wherein the content of the pesticidal active compound in the granular composition (a) is about 1/4 or less of the total content of the pesticidal active compound in the mixed granular pesticide composition. Composition.   A granular composition obtained by coating a nucleus with a mixed composition containing a pest control active compound, a water-based urethane resin as a polymer resin, a hydrophobic substance, talc, and optionally an agrochemical adjuvant.   A granular composition obtained by coating a nucleus with a mixed composition containing a pest control active compound, a water-based urethane resin as a polymer resin, a hydrophobic substance, talc, potassium sulfate as a water-soluble substance and optionally an agrochemical adjuvant. The granular composition according to claim 6 or 7 , wherein the hydrophobic substance is calcium stearate and the grain core is silica sand. The granular composition according to any one of claims 6 to 8, wherein the pesticidal active compound is a neonicotinoid insecticidal compound selected from imidacloprid, thiacloprid, clothianidin, thiamethoxam, nitenpyram, dinotefuran and acetamiprid.