JPS588003A - Preparation of dust blended with agricultural chemical - Google Patents

Abstract

PURPOSE:In blending the titled dust comprising a votalile germicidal component with an insecticidal component with an adsorbing carrier for preventing the volatility of the germicidal component, to prevent the reduction in effect of the insecticidal component, by blending the dust with the insecticidal component as a premix of it and a specific adsorbing carrier. CONSTITUTION:A premix or dust obtained by blending a volatile germicidal component such as 3-hydroxy-5-methylisoquinazole, etc. effective for controlling sheath blight of rice plant, etc. with an adsorbing carrier (preferably acid clay, or activated clay) for preventing the volatility of the germicidal component is blended with a premix obtained by blending an insecticidal component such as organic phosphorus compound with an adsorbing carrier (especially white carbon, for not causing the reduction in its effect, and, if necessary, a carrier, to give blended dust which prevents the reduction in the effect caused by the volatility of the germicidal component, preventing the reduction in the effect of the blended insecticidal component as well. Preferably the premix of the germicidal component and the premix of the insecticidal component are blended with the carrier, to give the dust.

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 spraying on foliage, etc. The object of the present invention is to obtain a mixed powder that does not reduce the efficacy of the insecticidal ingredients blended therein.

It is preferable that the bactericidal component be retained on the foliage for as long as possible so that it can be absorbed into the surface of the foliage or gradually into the interior of the foliage and act on the bacterial cells. One example of this is a pigeon house where the compound volatilizes. Therefore, when formulating volatile sterilizing ingredients, it is essential to suppress volatilization and maximize effectiveness! It is.

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 in order to achieve maximum effectiveness.

Incidentally, recently, powders containing bactericidal and insecticidal ingredients are often used for the purpose of saving labor in spraying, so even if volatile bactericidal and insecticidal ingredients coexist, each will still be fully effective. Production of blended powders is desired.

sPC reduces the effectiveness of ingredients, but if insecticidal ingredients are premixed using a specific method and then later blended,
It has been found that although the insecticidal components are equalized in the final powder, they are hardly affected by re-diffusion into acid clay and the like, and exhibit sufficient efficacy.

The method of the present invention uses a premix containing a volatile fungicidal component mixed with an adsorbent carrier capable of preventing its volatilization, and a premix containing a dust powder, and a premix containing an insecticidal component mixed with an adsorptive carrier that does not reduce its efficacy. This is a method of manufacturing an agrochemical mixed powder by mixing with a carrier if necessary.

In the present invention, a volatile bactericidal component is one whose effectiveness is unstable, such as a decrease in efficacy due to volatilization during spraying on foliage, and whose vapor pressure at approximately 20°C is 1×1.
■It is more than Hf. Such fungicidal components include, for example, 3-hydroxy-S, which is effective in controlling rice sheath blight, etc.
-Methylisoxazole (generic name Himexazole),
5-ethoxy-3-trichloromethyl-, which is effective in controlling vegetable blight, etc., is also 2,4-thiadiazole (generic name: nitridiazole), and 4-chloro-3-methyl-, which is effective in controlling rice blast, etc. Benzothiazol-2-one (CM
II? ) etc.

The insecticidal component may have high or low volatility to a certain extent, and is not particularly limited, but for example, &O-dimethyl 0
-(S-Methyl-4-nitrophenyl)thiophosphate (fenitrothion), LO-diethyl 0-(S-
phenyl-3-inxazolyl) phosphorothioate (
inxathion), tortoise-dimethyl $-(3-methyl-4-methylthiophenyl)thiophosphate (fenthion), (L(1-dimethyl0-[2-chloro-1-
(2,4-dichlorophenyl)vinyl]phosphate (
dimethylvinphos), ethyl α-(h0-dimethyl-
Organophosphorus compounds such as dithiophosphoryl)phenylacetate (fuentate), O-di-n-propyl@-(4-methylthiophenyl)phosphate (propaphos); 1-naphthyl N-methylcarbamate (carbaryl), m-tolyl N-methyl carbamate (MteM
, O), λ4-xylyl monomethyl carbamate (MP
MO), λ5-xylyl N-methylcarbamate (nt
c) Carbamate compounds such as 2-5ea-butylphenyl-methylcarpame-) (BPMC); Examples include pyrethroid compounds such as permethrin, resmethrin, and fenvalerate.

The adsorbent carrier capable of preventing volatilization of the volatile sterilizing component may be one that can sufficiently adsorb the vapor of the volatile sterilizing component,
For example, acid clay, which is a montmorillonite clay adsorbent,
Activated clay, bentonite, etc. are used. In particular, materials 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. Although it varies depending on the required amount of the adsorbent carrier, the physicochemical properties of the volatile bactericidal component, and the adsorption capacity of the carrier, the amount of acid clay, activated clay, and activated clay in the final powder is preferably 20 or more L4$- or more. Achieve your goal by including. This carrier may be added at the time of manufacturing the volatile fungicidal premix powder, or the missing amount may be added at the mixer's side.

The round adsorbent carrier for producing the premix 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. Any substance may be used as long as it does not cause a decrease in efficacy even when mixed with insecticidal ingredients. Examples of such adsorptive carriers include white carbon, diatomaceous earth-1 pumice powder, natural or synthetic zeolite, and silica gel. In particular, white carbon can be synthesized in the form of hydrated silicic acid, hydrated silicate, or anhydrous silicic acid, and can be acidic, neutral, or alkaline in water. The most appropriate one is selected. When producing a premix of the insecticidal component, the amount of adsorbent carrier used is preferably 1 part or more based on the aSS part per 1 part of the insecticidal component.

The carriers used 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, and calcium carbonate (heavy).

To mix the volatile bactericidal component or insecticidal component with the above-mentioned adsorptive or active carrier, if the base ingredient is a solid raw material at room temperature, the base ingredient and carrier may be mixed and pulverized, or the solid raw material may be mixed with heating method M or It is dissolved in a solvent 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 as is.

The most preferable method for producing the mixed powder of the present invention is to mix and pulverize a premix of volatile sterilizing ingredients and a premix of insecticidal ingredients together with a carrier. A method in which a premix of insecticidal ingredients is mixed with a premix of an insecticidal ingredient, and a premix of an insecticidal ingredient is mixed with a carrier to produce a powder, and a premix of a volatile sterilizing ingredient is added to this. As for the mixing method, a powder may be prepared by mixing and pulverizing a volatile fungicidal component with an adsorbent carrier capable of preventing its volatilization, and a premix of the insecticidal component may be mixed into 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 is 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 Hymexazole premix [hymexazole drug substance (9
To 345 parts of a pulverized mixture of 40.1 parts of 89G) and 2 parts of acid clay 51L, 4s parts of fenitrothion premix [pulverized mixture of 41.5 parts of fenitrothion raw material (96.5%) and 5ILS of white carbon] was added. The mixture was ground and mixed in a hammer mill, and 3&0 parts of clay and SU parts of acid clay were added and mixed with stirring to obtain a powder.

Example 2 Hymexazole premix [hymexazole bulk C@
8%>L2 part was dissolved in LO part of methylene chloride, adsorbed and mixed with acidic clay SO, O part, and the methylene chloride was volatilized to make 512 parts of inxathion premix [inxathion raw material (11fk) 440 parts Add 345 parts of a pulverized mixture of 5 & o parts of white carbon and pulverize with a hammer mill, then add 4LSg of clay and mix with stirring to obtain a powder.

Example i Hymexazole premix (same product as Example 1)! L
! Part 1 contains MTMO premix [MTMO original material (SS
%) was dissolved in methylene chloride solution, mixed with white carbon and mixed with 1 part of methylene chloride, crushed in a hammer mill, and the methylene chloride was volatilized] 77.2 parts of clay S1.
Add 3 parts and 1 part of acid clay 5Q and mix with stirring to obtain a powder.

Example 4 Hymexazole premix (same product as Example 2) 5
M in the 42nd part? MO premix (same product as Example 3)
Add 1.2 parts, grind and mix in the same way, and then add clay 4a@
1 part and stirred and mixed to obtain a powder.

Example i Nitridiazole premix [mixture pulverized product of 27.1 parts of nitridiazole raw material (95%) and 71 parts of acid clay] To 11.0 parts, 331 parts of clay and 5 ILI parts of acid clay were added and the same procedure was carried out. After pulverization and mixing, BPMO Flemix [mixed pulverized product of 404 parts of BPMOi (11.5%) and 5 ILJ parts of white carbon]! 5 parts of L were added and mixed with stirring to obtain a powder.

Example 1 Phenate premix [Phenate raw material [s16]
h) To 315 parts of a mixed pulverized product of 41.7 parts of white carbon and 513 parts of white carbon, 3io parts of clay and sue parts of acid clay were added and mixed in the same manner, followed by nitridiazole premix (same product as in Example 5)5. 5 parts were added and mixed with stirring to obtain a powder.

Example 7゜CMBT premix ((!MBτ bulk (Its %
) 41.5 parts of pulverized mixture of acid clay and 515 parts of acid clay] 4s parts and fenitrothion premix (same product as Example 1)
To 45 parts, 89 parts of clay and parts of acid clay SO,O were added and mixed with stirring to obtain a powder.

Example East (:!MB'! Raw material (96.5%) l 3 parts, acid clay StO part and clay 417 parts were mixed and ground to make a powder, and further permethrin premix [permethrin raw material (s s %) ) 2oo part and white carbon 7
7.0 parts of mixed pulverized product] 1. ＠ part was added and ground and mixed to obtain a powder tube.

Example 1 Hymexazole premix (same product as Hymexazole Example 2) After mixing part tS and 5 tost' of clay, the mixture was ground in a hammer mill to obtain a powder.

Example 1a OMBT premix [: cMBrg body (mis S
) and 515 parts of activated clay 35.
5 parts of isoxathion premix [same as in Example 2, 345 parts, and 89 parts of clay were mixed and ground in a hammer mill to obtain a powder.

Test Example 1゜Volatilization Suppression Test of Volatile Bactericidal Components Regarding the powders produced by the methods of JHIC hymexazole), Example S (nitridiazole) and Example 7 (CMBr), and the effect of acid clay in each formulation, Instead, the residual rate of volatile sterilizing components was measured for powders using the carriers listed in Table 1.

For the volatility test, take a powder sample of about 5 mm, place it on a wire mesh of a standard sieve (150 mesh), and use a brush to spread it as uniformly as possible onto a 5 x 10 G slide glass from a height of about 10 am. Powders 29-30 were sprayed. This slide glass was placed in a thermostat pre-adjusted to 60°C and relative humidity TO% for 24 hours to volatilize the bactericidal components, and then removed.The sample on the slide glass was washed off with acetone, and each The residual density of the bactericidal component was quantified, and 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 IK.

Table 1 shows a round sample in which the base agent was dissolved in methylene chloride and adsorbed onto a carrier, and then the methylene chloride was distilled off.

As is clear from Table 1, the volatility of the bactericidal component in the powder of the present invention is well controlled, but when the powder was replaced with a general carrier, the volatility was extremely large.

Rice sheath blight control experiment (protective effect) Plastic container (30X4ScI!, depth 2saM
) was grown to the middle stage of panicle formation (variety = 4 plants, Nipponbare, /), each test powder was sprinkled at a rate of 41.21 or 1f/111" using a small duster, and 7 After leaving it for a day, sheath blight fungus (Psll)
icultria 5asakii) was tied to the stem at the ground level and inoculated. This temperature 2
After storing for 14 days in a greenhouse at 1 to 30° C. and a humidity of 90% or more, the degree of disease onset was determined by the height of lesion formation (cll). Table 2 shows the average SOO value for each ward of three consecutive races. The control powder is a powder prepared by premixing the volatile film 1M component and the insecticidal component in each example and mixing it with a clay-only carrier in the same way as a general powder production method.

Powder 2″1 Example 3 4. αT-Powder
2t.

1 48 Example 10 4 Control powder 2 tsl
, 11@ Control powder 2 121
2α1 Test example Tomato blight control experiment Plastic container (30 x 45 cm, depth 2 Sdll
) grown to the 6-1 leaf stage (variety: Shinpuku Kotobuki,
1/Yong. ) with a small duster at a ratio of 41.29 or 1 j'/z', and after leaving it for 3 days, separately prepared
1 nfestans) spores were spray inoculated. He left the plants in a greenhouse for 24 hours at a temperature of 20℃ and a humidity of over 8 degrees, then moved them to a greenhouse at 25 to 27 degrees Celsius and a humidity of 8. Calculate the area ratio of the lesions and draw a circle. Each ward was divided into three series, and the average values are shown in Table 3. The control powder was the same as that described in Test Example 2.

Table 3 Example 5-4 ・Powder
2.

1 12 40 powder of Example 6 2s I Is 4 of Example 5 45 Control powder 2 7s Example mouth
4 51 control powder
2 81 No spraying iss Test example 4゜ Rice blast control experiment
e) were grown at 3 to 41 Mt in late-marriage seedlings in an outdoor field, where many cases of 4f and 2f''1 were grown, and each test powder was sprayed with a small duster at a ratio of 4f and 2f''1 to 9 rice (variety: Norin 2o). (Before the first appearance of rice blast disease. 15♂ per area, 3 consecutive times, and 180 arbitrary K were removed from each area after 14 days by removing the chemical spray T)
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 4 Example 1 (1) 4 as
42 powder 'l
if &11 1, S
Elephant S Example S 4
1.1 45 powder 2
&3 t・1 74
1t, 2 Example T 4
12 1L2 control powder 2
&2 2 4 example $4
Tl! 45 vs R powder 2
tis 2*s no spraying
In the disease control tests of Test Examples 2 to 4 above, the powders produced by mixing the volatile fungicidal component of the present invention with acid clay were far more effective than the powders produced by mixing them with the control clay. It can be seen that the medicinal efficacy is high, and the decrease in efficacy due to volatilization is small.

Test example I: Brown planthopper and black leafhopper insecticidal experiment Upper inner diameter 1
asc*, bottom inner diameter lG1 depth 11) A 1111N plastic pot was filled with soil and water to form a paddy field, and three seedlings (Tokai No. 17) were planted and grown in a greenhouse. Rice is I
At 9 o'clock, when the rice had grown to Sawg degree, a transparent thin plastic cylinder with an inner diameter of &ScM and a height of 251 cm was placed over the pot to cover the rice. For powder, use a commercially available engine cleaner (K-
@1゜Kinki Seisaku Shin, Osaka), which was processed so that a small plate (porcelain crucible lid, diameter zrx) containing the specified powder was placed at a distance of 1 f from the spout. Insert this into the cylinder until the small plate is close to the water surface of the pot, and then blow out air momentarily from the tip (compressor pressure ts#/d) to scatter the powder in the small plate. The upper part of the cylinder was closed with a foam rubber disk to prevent the powder from leaking out of the cylinder.

Thereafter, about 10 test insects per pot were released into paper cones that had been placed inside the cylinder in advance, and allowed to move freely onto the shaker. The cylinder has a nylon course upper + t
- Cover and keep in a room with lighting at 2S1±1℃ for 16 hours.
After 72 hours, a determination of life or death was made. Each ward will have two consecutive visits. The results are shown in Tables 5 and 6.

In addition, control powder A is a powder prepared by mixing the same clay and acid clay as in the example without premixing the insecticidal component with the premix of the volatile bactericidal component in each example. Control powder B is a powder produced by mixing with a clay carrier only, without premixing either the volatile bactericidal component or the insecticidal component in each example, in the same way as in a general powder production method. Control powder C is a powder prepared by mixing the volatile bactericidal component and the bactericidal component in each example with a carrier of only acid clay without premixing.The powder of the present invention and the control powder are both stored in a closed container. A test was conducted on fresh meat that had been stored in 40 U for one month.

Table 5: Test against the final instar larva of the Japanese black leafhopper Table 6: Test against the final instar larva of the Shinwa black leafhopper From Tables 5 and 6 above, the insecticidal efficacy of the powders of the examples of the present invention is compared to the respective controls using only clay as a carrier. It was equally effective as powder B. However, the bactericidal efficacy of the control powder B was reduced as shown in Tables 2 to 4. Control powder C, which uses only acid clay as a carrier, does not reduce its bactericidal efficacy, but
Insecticidal efficacy is significantly reduced. The control powder, which was formulated without premixing the insecticidal ingredients, showed a significant decrease in insecticidal efficacy due to the influence of acidic clay. As vapor is adsorbed by acid clay, volatility is suppressed and sufficient efficacy is exhibited, and the insecticidal ingredients adsorbed by white carbon are no longer affected by acid clay and exhibit sufficient efficacy. It has an excellent effect.

Special fraud applicant: Sankyo Co., Ltd. Agent: Patent attorney Shoji Kashiyama

Claims (1)

[Scope of Claims] 1. A premix 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. A method for producing an agrochemical compound powder, which comprises mixing the following with a carrier if necessary. 2. The manufacturing method according to claim 1, wherein a premix of a volatile fungicidal component and a premix of an insecticidal component are mixed together with a carrier. The method according to claim 1 or claim 2, wherein the carrier for the low-volatile bactericidal component is clear clay or activated clay, and the carrier for the insecticidal component is white carbon. The non-volatile bactericidal component is 3-hydroxy-5-methylinxazole, 5-ethoxy-3-IJ chloromethyl-t2,3-thiadiazole or 7't is 4-chloro-3
-Methyl-1,3-benzothiazol-2-one. The method according to claim 1, wherein the insecticidal component is an organic phosphorus compound, a carbamate compound, or a pyrethroid compound.