JPS6011007B2 - Composition for controlling blast disease - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composition for controlling rice blast disease. -benzisothiazoline-mikawaone-1,1-dioxide (hereinafter referred to as compound A) or 3-furyloxy-1,2-benzisothiazole-1,1-dioxide (hereinafter referred to as compound B). The present invention relates to a composition for controlling rice blast disease.

Compound A is a compound known in Japanese Patent Publication No. 48-40734, and compound B is a compound described in Japanese Patent Publication No. 45-12157 and Japanese Patent Publication No. 46-1490.

Regarding isopropiolane, Samurai Kosho 44-44526
According to the specification of Tokusei No. 49-3052,
Its blast control action is well known. Isoprothiolane is also used as a blast control agent for soil treatment, and the amount used is selected from the range of 360 to 6,002 kg per 10 ares of Honda as an active ingredient. However, the effectiveness of soil treatment with isoprothiolane in controlling blast disease may vary depending on environmental conditions. The inventors of the present invention have conducted various studies to improve this problem, and have unexpectedly found that this problem can be solved by incorporating Compound A or B.

According to the findings of the present inventors, even when a very small amount of Compound A or B is added to isoprothiolane, it is possible to achieve a blast control effect that cannot be expected from each compound alone. Regarding the rice blast control effect, effects that could not be predicted based on conventional knowledge can be cited. The present invention is based on this new knowledge.

Compound A used in the present invention has a melting point of 1640 to 165
It is a white powder showing q0, and acute oral administration using mice is LD.
It shows 9/k9 with 4000 to 8000 spots, and the fish poisoning using carp is TLM Gomatsu. It is of blood pressure and low toxicity. On the other hand, Compound B is a white or pale yellow crystalline powder with a pure melting point of 138 qo, and has an acute oral toxicity value of LD using mice.
3/kg of arc 2220-2750, TLM using carp
Wax is commercially available under the name of probenazole granules as a low-toxicity and long-lasting medicine with a 6.3 skin rating. The present invention
This includes embodiments in which Compound A or B and isoprothiolane are used as they are.

On the other hand, in accordance with customary practices in pesticide formulations, suitable inert fillers,
Adjuvants and additives are selected to formulate formulations that are convenient for use.
It may also be used as a drug. That is, compound A or B and isoprothiolane are dissolved, dispersed, mixed, impregnated or adsorbed in an appropriate inert carrier, with the addition of auxiliary agents if desired, and then prepared into an appropriate dosage form, such as a solution, emulsion, or hydrated carrier. agent, powder,
It may be formulated into granules, pastes, etc.

At this time, it is of course possible to add adhesives, wetting agents, pigments, etc. to ensure or increase the effect. The blending ratio of isoprothiolane and Compound A or B is approximately 1 to 50% (parts by weight) of the latter to 1 part by weight of the former.

(the same applies hereinafter) may be determined as appropriate. The proportion of the mixture of compound A or B and isoprothiolane in the preparation (product) can be adjusted as necessary.

For example, when making granules, the total amount of ingredients is usually about 6 to 1
5%, usually about 20 to 5% when used as an emulsion or wettable powder.
It is appropriate that the ratio is 80% (both relative to the product). For the control of rice blast, the composition of the present invention can be applied to rice plants or the environment containing the same in an amount effective for controlling rice blast, either as it is or in the form of dilution or suspension as appropriate with water, etc. Apply and use. The composition of the present invention occurs in Honda and is used for the control of rice blast. The composition of the present invention is
It is particularly useful for controlling leaf blast. The composition of the present invention is applied by effective means to absorb the ingredients from the lower part of the rice body and exhibit an anti-blast effect.

The present invention herein encompasses two exemplary embodiments.
One of them is an embodiment in which the composition of the present invention is applied in a submerged state (referred to as water surface application) (including, of course, cases in which the composition is submerged in water after treatment), such as soil surface treatment, soil mixing treatment, and underwater treatment. , water surface treatment, etc. In this case, the composition of the invention is
It is convenient that the drug is in the form of granules, such as fine granules, granules, tablets, and the like. The term "granular material" used in this specification is not limited by its size, shape, manufacturing method, etc., and includes, for example, rod-shaped, spherical, cylindrical, elliptical, irregularly shaped, plate-shaped, etc. Among the typical embodiments of the present invention, the composition of the present invention is applied to a rice seedling medium for young seedlings during the seedling-raising period. In this case as well,
The composition is applied by an effective means to absorb the ingredients from the lower part of the rice body and exhibit an anti-blast effect.

The medium here may be any medium in which rice seedlings can grow, such as soil, compost, humus, cultivated soil, processed cultivated soil, paper, cloth, net, film, foamed synthetic resin mat, etc.
It includes other similar items as well as combinations of one or more of these.

Then, the composition of the present invention is treated in the medium by a method effective for distributing it as uniformly as possible in the medium.
Compound A or B and isoprothiolane are absorbed from the lower part of the rice body and exhibit antiblast effects, so if the above components are absorbed during the seedling-raising period and the components are further supplied after transplanting, The blast control effect becomes even more certain.

In this sense, this embodiment is advantageously applied to a cultivation system in which a portion of the culture medium is brought to Honda together with the seedlings at the time of transplantation of so-called "seedlings with seeds".
By the way, this embodiment includes an embodiment in which the composition of the present invention is included in the medium in advance, and an embodiment in which it is treated before transplantation.

In the latter case, as in the case of water surface application, it is convenient for the composition of the invention to be in the form of granules. It should be noted that the medium containing the active ingredient used in the present invention or a composition containing the same can be used for bedding or soil covering by increasing the amount as necessary and falls within the scope of the present invention.

The amount of the composition of the present invention to be used varies depending on various factors such as the degree of damage, tendency of occurrence, weather, environmental conditions, dosage form, cost, component content in the preparation, embodiment, etc.

Generally, for water surface application, 10
Apply at a rate of 3 to 5 kg per are. Furthermore, when preparing rice seedling towers, granular preparations should be prepared in the form of 1,800 square meters of seedling tower ground (this is 6 cucumbers in length x 30 meters in width for seedling cultivation).
Since the cultivation method using boxes 3 skins high is widespread, this cultivation method is applied to the present sea bream, and the scales are taken into consideration and the table is simply displayed. ) per seedling transplant: 50-7
Apply at a rate of 5 evenings. In general, rice seedlings equivalent to 10 acres of Honda can be grown from 15 to 1 rice seedling raising boxes of the above-mentioned size. In addition, when raising seedlings in a box using a medium containing the active ingredient used in the present invention or a preparation containing the same in advance, the medium in the seedling box has a thickness of approximately 2.5 to 3 cm. The pagoda is filled (the weight of the toji at this time is approximately 2-3k9).

), therefore, the amount of active ingredient used in the present invention is calculated from the amount of granules used per beach area volume, approximately 450
The amount may be determined from a range of approximately 3 to 12 hours per 0 to 5,400 lumps (total amount of ingredients). The composition of the present invention can also be used in mixed compositions or in combination with one or more other pesticides, fertilizers, plant nutrients, etc. that are also used in the context of its application.

Typical pesticides used for this purpose include: MEP, diazinon,
MPP, PAP, M old CP, PMP, pro/guhos, N
AC, BPMC, MTMC, MIPC, PHC, MPM
C, XMC, chlorphenamidine, cartap, M○,
Benthiocarb, 2.4-DP, MCP, Ptachlor, Clomethoxynil, Molinate, BP, Captan
Hydroxyisoxazole etc. Next, some examples of the present invention will be shown, but the present invention is not limited thereto.

"Parts" indicate parts by weight. Example 1 Isoprothiolane 12 parts Compound A
O. 5 parts calcium ligninsulfonate 2 parts clay 85.5 parts are well mixed and pulverized, an appropriate amount of water is added and the mixture is thoroughly kneaded, made into granules with a particle size of, for example, 0.6 to 1 willow using a granulator, and dried. and make it into a product.

For example, this granule is, for example, 3 to 5 k per 10 are of Honda.
It is used by applying it to the water surface at a ratio of 9 parts.

In addition, for example, this granule can be used in a rice seedling box (length 60 skins x width 3
0x3 height) Treat each piece with soil for 50 to 75 days, for example.

Example 2 Isoprothiolane 11 parts Compound B I part Polyvinyl alcohol 2 parts Talc/clay mixture Form into granules and dry to make a product.

For example, the granules are 3-5k per 10 ares of Honda.
It is used by applying it to the water surface at a ratio of 9 parts.

Next, some test examples will be given to prove the effectiveness of the composition of the present invention.

Test Example 1 A test chemical (according to the formulation of Example 1) was added to the water surface of a 12-diameter pot (equivalent to 1/10,000 are) in which paddy rice seedlings (variety: Nipponbare, 5-6 hollyhock stage) were growing.

) was uniformly treated, placed under subdued light conditions, and 4 days after treatment, rice blast fungus spore suspension was inoculated at the foot of the plant, the number of lesions was investigated 4 days after inoculation, and the control value was determined according to the following formula. . 1 ward, 3 lotus system.

Control value (%): Sansan XI dish A: Number of lesions in untreated area B: Number of lesions in treated area The results are shown in Table 1.

Table 1 Table 1 shows that Compound A or B is effective in enhancing the blast control effect of isoprothiolane.

In addition, when determining the synergistic effect, the sum of the control value equivalent rate of the other drug and the control value percentage of the one drug with respect to the percentage that cannot be controlled by one drug was used as an additive calculation value. Test example 2 Seedling box containing Kumiai granular culturer (60 foxes x 30 arcs x 3
Seed fir (variety: Nipponbare) was sown on the skin, and 5 days later, one box of the test drug (according to the formulation of Example 1) was sown.

) was subjected to soil treatment at a rate of 75 days, and a certain section (1 bag x 1 skin) was cut and transplanted into a pot with a diameter of 12 skins, and grown in a greenhouse. Thirty-five days after transplantation, a rice blast spore suspension was spray inoculated, and four days later, the number of lesions was investigated, and the control value (%) was determined according to the formula described in Test Example 1. 1 ward, 3 lotus system.

The results are shown in Table 2.

Table 2

Claims (1)

[Scope of Claims] 1 Diisopropyl 1,3-dithiolane-2-ylidene malonate and 2-benzylcarbamoyl-1,2-benzisothiazolin-3-one-1,1-dioxide or 3-allyloxy-1. 2-Benzisothiazole-
A composition for controlling rice blast, characterized by containing 1,1-dioxite. 2 Diisopropyl 1,3-dithiolane-2-ylidenemalonate, 2-benzylcarbamoyl-1,2
- A patent claim containing benzisothiazolyl-3-one-1,1-dioxide or 3-allyloxy-1,2-benziisothiazole-1,1-dioxide in a proportion of 1 to 50% (by weight) The composition for controlling blast disease according to item 1. 3 Claim 1 or 2 which is a water surface application agent
The composition for controlling blast disease described in Section 1. 4. The composition for controlling blast disease according to claim 1 or 2, which is used to treat a rice seedling growing medium.