JP2671130B2 - Agricultural pesticide powder for stock control - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an agricultural plant base pest control agent.

2. Description of the Related Art Conventionally, agricultural powders have been widely used in Japan as various insecticides, bactericides and their mixtures.
In general, one of the essences of pesticide formulations lies in how effectively the pesticide active substance as its dosage form reaches each desired part of the plant body. The powder is the most widely used because it has a merit that it can be applied comparatively easily without diluting the commercially available formulation as it is, and that it can simultaneously control various pests and diseases by using a mixture, and can save labor. There is. On the other hand, the pollution caused by the scattering of dust during spraying has become a problem, and driftless dust (DL powder) has come to be used as a dust with reduced drift (drift). One of the weaknesses of dust is Has been resolved. However, it has often been pointed out that the conventional powders or DL powders have a problem that the pesticidal active substance does not effectively reach the pests and insects in the strain source, resulting in insufficient effects. Recently, studies have been conducted on the improvement of the root stock control effect by improving the spraying equipment, but a means for effectively solving the shortage of stock root control effect has not yet been found as a formulation.

DISCLOSURE OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION Dusts having the above-mentioned advantages in application surface, and further DL powders with improved medicinal effect and safety, where the weaknesses still exist, strain The emergence of means for overcoming the lack of original control effect is highly anticipated. Above all,
Expectations are high for the development of appropriate formulations and their application methods for blight and planthopper.

It is an object of the present invention to provide an agricultural powder or DL powder which can efficiently reach the root of the plant and exert a sufficient control effect against pests such as rice that occur in the root.

Means for Solving the Problems The present inventors have conducted various studies on pest control in the strain source, which is often problematic as a lack of effect in conventional powders or DL powders, and validamycin is a specific particle. The present invention has been completed by further studies, finding that a powdery agent having a diameter and further having a particle size adjusted by passing through a sieve of a specific mesh can surprisingly effectively control the root of the plant.

That is, the present invention, the total formulation 100 parts by weight 0.0
50% or more of 1 to 10 parts by weight of validamycin is 10 to 60
A pesticide for controlling pesticides, which is prepared by controlling the particle size of components by adjusting the particle size of the components to a range of μm (particle size by Coulter counter method) and passing through a 200 mesh screen.

However, conventionally, as the pesticidal active substance to be mixed in the powder, fine particles having a particle size of 10 to 60 μm used in the present invention are generally used because they are accompanied by drawbacks such as technical difficulty, reduction in productivity, and bulkiness. There is no example in which a particle having this particle size is produced especially for a stock control agent.

However, unexpectedly, as validamycin, its
When 50% or more is adjusted to a particle size in the range of 10 to 60 μm,
It was found to be effective for controlling the roots of the plant. Furthermore, when passing through a 200 mesh (74 μm) sieve during formulation,
It was also found that the effect was more remarkable. Thus, the present invention uses a Coulter counter having a particle size of validacoisine as a powdery agent for controlling the root cause of bacterial wilt disease ("Powder Engineering Handbook" edited by The Powder Engineering Society of Japan (issued by Nikkan Kogyo Shimbun)
The characteristic feature is that the one having a thickness of 10 to 60 μm is used according to pages 22 to 23).

More specifically, in order to produce the powdery agent of the present invention having a protective effect against a strain, 70% of the active ingredient of validamycin itself is used.
From the above, preferably, 85% or more is produced by adjusting so as to fall within the range of 10 to 60 μm, and if desired, it is produced by mixing it with a carrier / auxiliary component and other additives by a usual method.

Further, after mixing the respective components, the powder is passed through a 200-mesh screen to adjust the particle size of the components, whereby the effect of controlling the roots of the powder of the present invention can be further improved.

In order to obtain validamycin with a particle size of 10-60 μm, the crystallization stage may be adjusted to produce particles with a size in that range, or if a relatively large particle size is prepared, The particle size can be adjusted by pulverization or spray drying. For the pulverization, for example, an atomizer, a turbo counter jet mill, etc. are often used. It is also possible to obtain particles having a particle size within a certain range by sled drying, and further crushing the particles to adjust the particle size to a desired value.

Carriers / auxiliary components and additives that may be added to the pesticide powder of the present invention include various flow aids (white carbon etc.), surfactants, dispersants (eg ethylene glycol etc.), adhesives, adsorbents, Antioxidants (such as dibutylhydroxytoluene), preservatives (such as sorbic acid), synergists, wetting agents, stabilizers (such as isopropyl acid phosphate), excipients, diluents and soybean flour, tobacco flour, wheat flour, etc. , Plant powders such as wood flour, such as clays (kaolin, bentonite, acid clay, etc.), talc (talc powder, wax stone powder, etc.), silicas (diatomaceous earth, mica powder, etc.) Other examples include solid carriers and auxiliary components such as calcium carbonate, sulfur powder, and activated carbon.

 Examples of validamycin used in the present invention include blight.
Validacin with control effect And the stock yuan defense
Monselenium needs to be removed (Pencyclon), Moncat
(Flutolanil), bacitac (Mepronil), etc.
Tsuma side with planter control action (MTMC), Sebin
(NAC), etc., and if necessary, other pesticide active substances
It may be a mixture with quality. Pesticides that may be mixed
Some examples of active substances are organic sulfur fungicides ... ethylene bis (dithiocarbamine)
Acid) zinc, ethylenebis (dithiocarbamine) manga
Ethylene, ethylenebis (dithiocarbamine) ammonium,
Bis (dimethyldithiocarbamic acid) ethylene bis (di
Organophosphorus fungicides such as dizinc (thiocarbamate) ... S-benzyl O, O-dithiophosphate
Isopropyl dithiophosphate S, S-diphenyl O-
Organic arsenic fungicides such as ethyl ... Iron methanearsonate, methanearso
Ammonium ferric acid and other organic base bactericides… pentachlorophenol, tetrac
Loloisophthalonitrile, 4,5,6,7-tetrachlorophthali
Other fungicides such as tricyclazole, N- (trichloromethane
Tylthio) -4-cyclohexene-1,2-dicarboxy
Mido, phenazine 5-oxide, 1- (butylcarbamoyl)
Yl) -2-benzimidazole carbamate methyl ester
Organic phosphorus bactericides, etc. MEP, dithiophosphoric acid S- [1,2-bi
S (ethoxycarbonyl) ethyl] O, O-dimethyl,
Acid 2,2-dichlorovinyl dimethyl, 2,2,2-tric
Lolo-1-hydroxyethylphosphonic acid dimethyl, N-
Acetylphosphoramide thiolate O, S-dimethyl,
Dimethyl Phosphate (E) -1-Methyl-2-methylcarbox
Luvamoyl vinyl, dithiophosphoric acid O, O-dimethyl S
-[Α- (Ethoxycarbonyl) benzyl], dithioly
Acid O, O-dimethyl S- (N-methylcarbamoyl
Methyl) and other organic base insecticides… 6,7,8,9,10,10-hexachloro-1,
5,5a, 6,9,9a-hexahydro-6,9-methano-2,4,3-he
Carbomate insecticides such as nzodioxathiepine 3-oxide Methylcarbamic acid 1-naphth
Cyl, methylcarbamic acid m-tolyl, methylcarba
Pyrethroid insecticides such as o- (sec-butylphenyl) mynate (BPMC) ... Pyrethrin, allethrin, res
Antibiotics such as metrin ... Blasticidin S, kasugamycin, poly
Other insecticides such as oxy and oxytetracycline ... Cartap hydrochloride, N- (methylcarbahydrate
Moyloxy) thioacetimidate S-methyl etc.
can give.

The amount of validamycin is usually 0.01 to 10 parts by weight, preferably 100 parts by weight, based on 100 parts by weight of the entire formulation of the present invention.
0.1 to 2 parts by weight. The amount of pesticide active substance other than validamycin in a mixed preparation of validamycin is 0.01 to 10 in the case of one kind, assuming 100 parts by weight of the whole preparation.
Parts by weight, preferably 0.05 to 5 parts by weight, and in the case of two or more kinds, the total amount is 0.01 to 10 parts by weight, preferably 0.05 to 5 parts by weight in total.

EFFECTS OF THE INVENTION The pesticide powder of the present invention exhibits an excellent effect of controlling the root of a plant against blight or other planthoppers as shown in the following control effect test.

EXAMPLES Next, the present invention will be described in more detail by way of examples. However, the present invention is not limited to this embodiment.

Example 1 Validamycin (average particle size 60 μm) having the particle size distribution shown in the table below 0.3 parts by weight Isopropyl acid phosphate 0.1 parts by weight White carbon 0.5 parts by weight Sorbic acid 0.1 parts by weight Clay 99.0 parts by weight after mixing with a kneader type mixer Then, the whole amount is remixed with a flash mixer to obtain a powder after sieving with 200 mesh.

Particle size distribution 10 to 60 μm 51% 60 to 120 μm 45% 120 to 250 μm 4% Example 2 Using powder of validamycin (average particle size 39 μm) having the particle size distribution shown in the table below, a powder is obtained in the same manner as in Example 1.

Particle size distribution 1 to 10 μm 6% 10 to 30 μm 32% 30 to 60 μm 45% 60 to 120 μm 17% Example 3 Validamycin (average particle size 12 μm) having the particle size distribution shown in the table below was used, and the same as Example 1. Get a powder.

Particle size distribution 1-5 μm 3% 5-10 μm 31% 10-60 μm 64% 60-90 μm 2% Example 4 0.3 parts by weight of validamycin (average particle size 39 μm) having the particle size distribution shown in the table below Isopropyl acid phosphate 0.15 parts by weight Liquid paraffin 1 part by weight White carbon 2.0 parts by weight Sorbic acid 0.1 parts by weight Clay 96.45 parts by weight is mixed with a kneader type mixer, and the whole amount is re-mixed with a flash mixer to obtain a powder after sieving with 200 mesh.

Particle size distribution 1 to 10 μm 6% 10 to 30 μm 32% 30 to 60 μm 45% 60 to 120 μm 17% Example 5 Validamycin (average particle size 21 μm) having the particle size distribution shown in the table below was used, and the same as Example 4 Get a powder.

Particle size distribution 5-10 μm 10% 10-30 μm 57% 30-60 μm 27% 60-90 μm 6% Example 6 Using validamycin (average particle size 12 μm) having the particle size distribution shown in the table below, Get a powder.

Particle size distribution 1-5 [mu] m 3% 5-10 [mu] m 31% 10-60 [mu] m 64% 60-90 [mu] m 2% Comparative Example 1 Using validamycin (average particle size 115 [mu] m) having the particle size distribution shown in the table below, as in Example 4. Get a powder.

Fineness distribution 10 to 60 μm 18% 60 to 90 μm 23% 90 to 120 μm 21% 120 to 250 μm 38% Comparative Example 2 The same as Example 4 using validamycin (average particle size 7 μm) having the particle size distribution shown in the table below. To get the powder.

Particle size distribution 1-5 [mu] m 15% 5-10 [mu] m 72% 10-30 [mu] m 12% 30-60 [mu] m 1% Using the respective powders obtained in Examples and Comparative Examples, the following test for controlling chipping was performed.

Test Example 1 Rice Stripe Blight Control Effect Test (Pot Test) Rice (variety: Nihonbare) was planted in a / 10000 pots, 3 strains each, and tested 2 months later. Three pots were tested per treatment. For spraying, 150 mg of the preparation was applied to 3 pots of rice using a spray gun with a compressor pressure of ² kg / cm ² .

The onset of the bacterial wilt disease was caused by inoculation: Immediately after spraying, three bacterial fungus pieces (φ8 mm disc) of the bacterial wilt disease fungus Rhizoctonia solani, which had been cultivated in potato agar medium, were attached to the roots of the rice plants, three at a time. 72 hours after the inoculation, the rice plants were kept in a humid chamber at 28 ° C to promote the disease and then transferred to a glass chamber. The disease onset was carried out 5 days after the inoculation on the lesion length (cm) of the inoculated stem. The control effect was expressed by the control value shown by the following formula based on the obtained lesion length.

Example 7 A powder agent is obtained in the same manner as in Example 4 by using validamycin (average particle size 24 μm) having the particle size distribution shown in the table below.

Particle size distribution 1 to 10 μm 2.1% 10 to 30 μm 70.6% 30 to 60 μm 26.3% 60 to 120 μm 1.0% Comparative Example 3 Using validamycin (average particle size 70 μm) having the particle size distribution shown in the table below, the same as in Example 4 Get a powder.

Fineness distribution 10 to 30 μm 8.4% 30 to 60 μm 29.8% 60 to 90 μm 38.8% 90 to 150 μm 22.8% 150 to 250 μm 0.2% Test Example 2 Rice blight control effect test (field test) 4 rice (variety: Koshihikari) The field transplanted on the 6th of each month was divided into 25 m ² sections and tested just before heading.

The spraying was performed using a pipe duster (5 m long) 3 days before the heading (July 2). The onset of rice blight was caused naturally. In the disease onset survey, after 30 days from the application, the disease onset rate was investigated for 100 strains in 1 ward. Next, the leaf sheath position in which diseased lesions were observed was investigated for all the stems of the disease-causing strain 1 group 10 strains, and the degree of damage was calculated by (Equation 1). Further, the field damage level was calculated from (Equation 2), and the control value was obtained from (Equation 3).

Damage level calculation method (Yoshimura method) Where N ₃ is the number of stems with lesions up to the flag leaf or leaf sheath N ₂ : The number of stems with lesions up to the next leaf or the second leaf sheath N ₁ : Up to the 3rd, 4th leaf or 3rd and 4th leaf sheaths Number of stalks with diseased group N: Total number of stalks (Formula 2) Field damage (%) = Damage to diseased strains x Disease ratio / 100 (Formula 3) Control value = [(Ic-It) / Ic] × 100 However, Ic: Field damage level of non-dispersed area It: Field damage level of chemical sprayed results are shown in the table below.

From the above test results, it is clear that the present invention is excellent as a stock control powder control agent.

(Effects of the Invention) The pesticide powder of the present invention exerts an excellent effect of controlling the root of a plant against the bacterial wilt disease as shown in the above-mentioned control effect test, or other planthoppers and the like.

Claims (2)

(57) [Claims] 1. 0.01 to 10 per 100 parts by weight of the whole preparation
A pesticide validamycin powder for controlling pesticides, in which 70% or more by weight of validamycin is adjusted to be in the range of 10 to 60 μm, and the particle size of the components is adjusted by passing through a 200 mesh sieve. 2. The agent according to claim 1, which is a powdery agent for controlling rice blight of rice.