JPS64361B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing an agrochemical mixed powder containing a volatile bactericidal component and an insecticidal component, which prevents the volatile bactericidal component from volatilizing and reducing the efficacy when sprayed on foliage, etc., and improves the efficacy of the insecticidal component blended therein. The purpose of this invention is to obtain a mixed powder agent that does not reduce the Since the bactericidal component acts on the bacterial cells either on the surface of the leaves or on the leaves, it is preferable to keep it on the leaves for as long as possible.However, one of the main reasons for its poor efficacy in the field is that the compound is It may evaporate. Therefore, when formulating volatile sterilizing ingredients, it is necessary to suppress volatilization and maximize effectiveness. The most practical means is to suppress volatilization by mixing volatile sterilizing components with an adsorbent carrier such as acid clay. However, when the insecticidal ingredient is formulated with acid clay or the like, the insecticidal efficacy is significantly reduced. This is because insecticidal ingredients are expected to be released quickly or have a gas effect to a certain extent in order to achieve maximum effectiveness. By the way, recently, powders containing a bactericidal component and an insecticidal component are often used for the purpose of saving labor in spraying, so even if the volatile bactericidal component and the insecticidal component coexist, the formulation is such that the respective effects can be fully expressed. Production of powder is desired. The present inventors have discovered that adsorbent carriers that prevent the volatilization of volatile bactericidal components, such as acid clay, reduce the efficacy of insecticidal components in conventional formulations, but they can It has been found that when blended, the insecticidal component is hardly affected by re-diffusion into acid clay, etc., and exhibits sufficient efficacy, even though it is equalized in the final powder. The method of the present invention comprises a premix in which a volatile sterilizing component is mixed with an adsorbent carrier capable of preventing its volatilization;
Either a premix containing an insecticidal ingredient mixed with an adsorbent carrier that does not reduce its efficacy and the carrier, or a powder containing a volatile fungicidal ingredient mixed with an adsorbent carrier that can prevent its volatilization, and an insecticidal ingredient mixed with the carrier. The present invention relates to the production of a mixed agrochemical powder, which is characterized in that it can be mixed with a premix mixed with an adsorbent carrier that does not cause a decrease in efficacy. In the present invention, a volatile bactericidal component is one whose effectiveness is unstable, such as a decrease in efficacy due to volatilization when sprayed on foliage, and whose vapor pressure at approximately 20°C is 1 x 10 ^-4 mmHg or higher. be. Such fungicidal ingredients include, for example, 3-hydroxy-5-methylisoxazole (generic name Himexazole), which is effective in controlling rice sheath blight, etc., and 5-ethoxy-3, which is effective in controlling vegetable blight, etc. Examples include trichloromethyl-1,2,4-thiadiazole (generic name etridiazole) and 4-chloro-3-methyl-benzothiazol-2-one (CMBT), which is effective in controlling rice blast. The insecticidal component may have high or low volatility to some extent, and is not particularly limited, but examples include 0,0-dimethyl 0-(3-methyl-4-nitrophenyl) thiophosphate (fenitrothion), 0,0-diethyl 0-( 5-Phenyl-
3-Isoxazolyl) phosphorothioate (isoxathion), 0,0-dimethyl 0-(3-methyl-4-methylthiophenyl)thiophosphate (fenthion), 0,0-dimethyl 0-
[2-chloro-1-(2,4-dichlorophenyl)
Vinyl] phosphate (dimethylvinphos), ethyl α-(0,0-dimethyl-dithiophosphorine) phenyl acetate (fuentate), 0,
Organophosphorus compounds such as 0-di-n-propyl 0-(4-methylthiophenyl)phosphate (propaphos); 1-naphthyl N-methylcarbamate (carbaryl), m-tolyl N-methylcarbamate (MTMC), 3 , 4-xylyl N-methylcarbamate (MPMC), 3,5-xylyl N-
Examples include carbamate compounds such as methyl carbamate (XMC) and 2-sec-butylphenyl N-methyl carbamate (BPMC); and pyrethroid compounds such as permethrin, resmethrin, and fenvalerate. The adsorbent carrier that can prevent the volatilization of volatile sterilizing components may be any material that can sufficiently adsorb the vapor of volatile sterilizing components; for example, acid clay, activated clay, bentonite, etc., which are montmorillonite clay adsorbents, may be used. It will be done. In particular, those having electrostatically active adsorption ability, such as acid clay and activated clay, are preferably used. Bentonite is also used as a base ingredient that is unstable to acids. The amount of adsorbent carrier required varies depending on the physicochemical properties of the volatile sterilizing component and the adsorption capacity of the carrier, but acid clay,
In the case of activated clay, the purpose is usually achieved by including it in the final powder at 20% or more, preferably 40% or more. This carrier may be added at the time of manufacturing the volatile sterilizing ingredient premix or powder, or the missing amount may be added in a subsequent mixing step. The adsorbent carrier for producing premixes of insecticidal ingredients is a so-called high oil absorption adsorbent carrier with a large specific surface area, and is different from the adsorbent carrier used for the volatile bactericidal ingredient. It may be used as long as it does not cause a decrease in efficacy even when mixed with insecticidal ingredients. Examples of such adsorbent carriers include white carbon, diatomaceous earth, fine powder of pumice,
Natural or synthetic zeolites, silica gels are used. In particular, white carbon includes synthesized hydrous silicic acid, hydrous silicates, and anhydrous silicic acids, which exhibit acidity, neutrality, or alkalinity in water, and any of them can be suitably used, and the most suitable one depends on the base material. things are selected. When producing a premix of the insecticidal component, the amount of adsorbent carrier used is 0.5 parts or more, preferably 1 part or more, per 1 part of the insecticidal component. Carriers added for the purpose of increasing the amount other than those mentioned above are those commonly used in the production of powders, such as talc,
Clay, calcium carbonate (heavy), etc. are used. To mix the volatile bactericidal component or insecticidal component with the adsorbent carrier, if the base ingredient is solid at room temperature, the base ingredient and carrier may be mixed and ground, or the solid ingredient may be melted by heating or dissolved in a solvent. It is dissolved and liquefied, and mixed and adsorbed onto a carrier. When the main ingredient is a raw material that is liquid at room temperature, it is usually used as is, but if necessary, it is dissolved in a solvent and mixed and adsorbed onto a carrier. When these solvents are used, the low boiling point solvent can be recovered during the manufacturing process, and the high boiling point solvent may be allowed to coexist in the formulation. The most preferable method for producing the mixed powder of the present invention is to mix and pulverize a volatile sterilizing ingredient premix and an insecticidal ingredient premix together with a carrier. A method of producing a powder by mixing a premix of an insecticidal component with the premix of an insecticidal component, a method of producing a powder by mixing and pulverizing a premix of an insecticidal component and a carrier, and a method of mixing a premix of a volatile fungicidal component with it. A powder may be prepared by mixing and pulverizing the fungicidal component with an adsorbent carrier capable of preventing its volatilization, and a premix of the insecticidal component may be mixed with this powder. In this way, it is essential to use a premix for the insecticidal component, but the volatile fungicidal component may be a premix or a powder, and can be mixed with other carriers at an appropriate stage. Furthermore, as described above, the amount of carrier needed to prevent volatilization of volatile sterilizing components may be added at an appropriate stage of the subsequent mixing step. It goes without saying that auxiliary agents such as stabilizers and physical property improvers can be added at appropriate stages of production. Production examples and test examples of the powder mixture of the present invention will be described below. Example 1 5.5 parts of hymexazole premix [pulverized mixed product of 40.8 parts of hymexazole (98%) and 59.2 parts of acid clay] were added to 5.5 parts of fenitrothion premix [41.5 parts of fenitrothion (96.5%) and white carbon. 58.5 parts of mixed pulverized product] Add 5.5 parts, pulverize and mix in a hammer mill, and then add 39.0 parts of clay.
1 part and 50.0 parts of acid clay were added and mixed with stirring to obtain a powder. Example 2 52.2 parts of hymexazole premix [2.2 parts of hymexazole raw material (98%) dissolved in 8.0 parts of methylene chloride, adsorbed on 50.0 parts of acid clay, and then volatilized with methylene chloride] was added to 52.2 parts of isoxathion premix. [Mixed pulverized product of 44.0 parts of isoxathion raw material (~91%) and 56.0 parts of white carbon] Add 5.5 parts, pulverize and mix in a hammer mill, and then add clay.
42.3 parts were added and mixed with stirring to obtain a powder. Example 3 5.5 parts of Himexazole Premix (same product as Example 1), 2.2 parts of MTMC Premix [MTMC raw material (98%)] was dissolved in 8.0 parts of methylene chloride, adsorbed and mixed with 5.0 parts of white carbon, and mixed using a hammer mill. [7.2] 7.2
37.3 parts of clay and 50.0 parts of acid clay were added and mixed with stirring to obtain a powder. Example 4 To 52.2 parts of Himexazole Premix (same product as Example 2), MTMC Premix (Example 3) was added.
7.2 parts of the same product) were added, pulverized and mixed in the same manner, and 40.6 parts of clay was further added and mixed with stirring to obtain a powder. Example 5 11.0 parts of etridiazole premix [pulverized mixed product of 21.1 parts of etridiazole raw material (95%) and 78.9 parts of acid clay], 33.5 parts of clay and acid clay
After adding 50.0 parts and pulverizing and mixing in the same manner, 5.5 parts of BPMC Premix [a mixed pulverized product of 40.6 parts of BPMC raw material (98.5%) and 59.4 parts of white carbon] was added and mixed with stirring to obtain a powder. Example 6 5.5 parts of phenate premix [pulverized mixed product of 41.7 parts of phenate raw material (96.0%) and 58.3 parts of white carbon], 39.0 parts of clay and acid clay
After adding 50.0 parts and pulverizing and mixing in the same manner, 5.5 parts of etridiazole premix (same product as in Example 5) was added and mixed with stirring to obtain a powder. Example 7 CMBT premixes [CMBT bulk (96.5%)
A pulverized mixture of 41.5 parts and 58.5 parts of acid clay] 39.0 parts of clay and 50.0 parts of acid clay were added to 5.5 parts of Fenitrothion Premix (same product as in Example 1) and mixed with stirring to obtain a powder. . Example 8 2.3 parts of CMBT raw material (96.5%), 50.0 parts of acid clay, and 46.7 parts of clay were mixed and ground to make a powder, and then permethrin premix [23.0 parts of permethrin raw material (93%) and 77.0 parts of white carbon] was prepared. 1.0 part of mixed pulverized product] was added and pulverized and mixed to obtain a powder. Example 9 5.5 parts of hymexazole premix [pulverized mixed product of 40.8 parts of hymexazole (98%) and 59.2 parts of activated clay], 5.5 parts of isoxathion premix [same product as in Example 2] and 89.0 parts of clay were mixed. It was then ground in a hammer mill to obtain a powder. Example 10 CMBT premix [CMBT bulk (96.5%)
Pulverized mixture of 41.5 parts and 58.5 parts of activated clay] 5.5 parts and isoxathion premix [same product as Example 2]
5.5 parts and 89 parts of clay were mixed and ground in a hammer mill to obtain a powder. Test Example 1 Volatilization suppression test for volatile bactericidal components The powders produced by the methods of Example 1 (hymexazole), Example 5 (etridiazole), and Example 7 (CMBT) were tested, and the acid clay of each formulation was tested. Instead, the residual rate of volatile sterilizing components was measured for powders using the carriers listed in Table 1. For the volatility test, take approximately 50 mg of a powder sample, place it on a wire mesh of a standard sieve (150 mesh), and use a brush to spread the powder onto a 5 x 10 cm slide glass as uniformly as possible from a height of approximately 10 cm. 20〜
30mg was sprayed. This glass slide was placed in a thermostat pre-adjusted to 60°C and 70% relative humidity for 24 hours.
After leaving it for a while to volatilize the bactericidal components, take it out, wash the sample on the slide glass with acetone, and quantify the remaining amount of each bactericidal component.
The residual rate was calculated based on the weight of the bactericidal component calculated from the initial sprayed sample weight. The results are shown in Table-1.

[Table] Shows the samples that were distilled off.
As is clear from Table 1, the volatilization of the bactericidal component in the powder of the present invention is well suppressed;
It can be seen that volatilization is extremely large when the powder is replaced with a general carrier. Test Example 2 Rice sheath blight control experiment (protective effect) Each test powder was applied to rice (variety: Nipponbare, 4 plants/container) grown to the middle stage of panicle formation in a plastic container (30 x 45 cm, depth 25 cm). Sprayed with a small duster at a rate of 4g, 2g or 1g/m ² and left in a greenhouse for 7 days,
sasakii) was inoculated by tying it to the stem at the ground level. This is done at a temperature of 27-30℃ and a humidity of 90℃.
% or higher for 14 days, the degree of disease onset was investigated by the height (cm) of lesion formation. Ward 1 3
The average values are shown in Table 2. In addition,
The control powder was prepared in the same way as the general powder.
The volatile bactericidal component and insecticidal component in each example were not premixed, but were mixed with a clay carrier to produce a powder.

[Table] Test Example 3 Tomato blight control experiment Tomatoes (variety: Shinpuku Kotobuki, 6 plants/container) grown to the 6-7 leaf stage in plastic containers (30 x 45 cm, depth 25 cm) were treated with each test. The powder was spread at a rate of 4 g, 2 g or 1 g/m ² using a small duster, and after being left for 3 days, separately prepared spores of Phytophthora infestans were spray inoculated. Place this in a humid room with a temperature of 20℃ and a humidity of over 100% for 24 hours.
After being left for a period of time, the leaves were transferred to a greenhouse at 25-27° C. and a humidity of 80% or higher, and after 5 days, the lesion areas were investigated on the top five leaves and the lesion area ratio per leaf was calculated. Ward 1 3
The average values are shown in Table 3. In addition,
The control powder was the same as described in Test Example 2.

[Table] Test example 4 Rice blast control experiment Each test was carried out on rice (variety: Norin No. 20) grown to the 3- to 4-leaf stage using late-sown seedlings in an outdoor field where rice blast (Pyricularia oryzae) is prevalent in the surrounding area. Powder was applied using a small duster at a rate of 4 g, 2 g, and 1 g/m ² (before the first appearance of blast disease). Each plot was 0.5 m ² and the number of lesions was determined in triplicate. Seven and 14 days after spraying, 100 plants were randomly picked from each plot and the number of lesions formed on the top two leaves was investigated. Table 4 shows the average number of lesions per leaf. The control powder was the same as that described in Test Example 2.

【table】

[Table] Control powder
2 10.3 29.5

Claims (1)

[Claims] 1. A premix in which a volatile bactericidal component is mixed with an adsorbent carrier that can prevent its volatilization, a premix in which an insecticidal component is mixed with an adsorbent carrier that does not reduce its efficacy, and a carrier are mixed. Or, an agrochemical compound powder characterized by mixing a powder in which a volatile bactericidal component is mixed with an adsorbent carrier that can prevent its volatilization, and a premix in which an insecticidal component is mixed with an adsorbent carrier that does not reduce its efficacy. Manufacturing method. 2. The manufacturing method according to claim 1, wherein a premix of a volatile bactericidal component and a premix of an insecticidal component are mixed together with a carrier. 3. The manufacturing method according to claim 1 or 2, wherein the carrier for the volatile bactericidal component is acid clay or activated clay, and the carrier for the insecticidal component is white carbon. 4 Volatile bactericidal component is 3-hydroxy-5-methylisoxazole, 5-ethoxy-3-trichloromethyl-1,2,3-thiadiazole or 4
-chloro-3-methyl-1,3-benzothiazol-2-one. 5. The production method according to claim 1, wherein the insecticidal component is an organic phosphorus compound, a carbamate compound, or a pyrethroid compound.