JPS5928528B2 - Composition for controlling blast disease - Google Patents

Description

[Detailed description of the invention] The present invention relates to a composition for controlling rice blast.

Furthermore, the present invention provides 1,2-benziisothiazole-3(2
H)-one-1,1-dioxide (hereinafter referred to as the present compound).

) or a salt thereof (hereinafter both are referred to as the present compounds).

) and diisoprobilt 3-dithiolane-2-ylidene malonate (hereinafter referred to as isobrothiolane).

The blast control action of this compound was
No. 96, No. 47-9428, No. 49-37247, and JP-A-48-5936 are publicly known.

In particular, according to the published specifications of the latter three, in order to control rice blast with the present compounds, 200 to 3
It is said that it is necessary to treat the soil at a rate of 0.00 (l).

Regarding isobrothiolane, Japanese Patent Publication No. 44-44526
No. and the specification of JP-A No. 49-30529,
Its blast control action is well known.

Inbrothiolane is also used as a blast control agent for soil treatment, and the amount used is selected from the range of 360 to 600 parts per 10 ares of Honda as an active ingredient.

However, the blast control effect of soil treatment with isobrothiolane may vary depending on environmental conditions.

The inventors of the present invention have conducted various studies to improve this problem, and have surprisingly found that this problem can be solved by incorporating the present compounds.

According to the findings of the present inventors, even when a very small amount of the present compounds is added to inbrothiolane, it is possible to achieve a blast control effect that cannot be expected from each compound alone; Regarding the action, effects that could not be predicted based on conventional knowledge can be cited.

The present invention is based on this new knowledge.

The salt of the present compound used in the present invention may be any salt having substantially the same activity as the present compound, such as inorganic salts such as sodium salt, potassium salt, calcium salt, zinc salt, and other organic salts. (e.g. ginseng salt).

These salts may be anhydrous or hydrated.

As the present compounds used in the present invention, it is particularly advantageous to use commercially available and easily available present compounds or their sodium salts.

The present invention includes embodiments in which the present compounds and inbrothiolane 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, the present compounds and inbrothiolane are dissolved, dispersed, mixed, impregnated, or adsorbed in a suitable inert carrier, with the addition of auxiliary agents if desired, to form an appropriate dosage form, such as a solution, emulsion, or aqueous phase. It may be formulated into a powder, powder, granule, paste, etc.

At this time, it is of course possible to add adhesives, wetting agents, pigments, etc. to ensure or increase the effect.

The compounding ratio of inbrothiolane and the present compounds is 1 part by weight of the former to the latter in terms of the present compound (the same applies in the following dosage indications).

) Approximately 1 to 50% (parts by weight. The same applies hereinafter.)

) may be determined as appropriate. The proportion of the mixture of the present compounds and inbrothiolane in the preparation (product) can be adjusted as necessary.

For example, in the case of granules, the total amount of ingredients is usually about 6 to
15%, usually about 20% when used as an emulsion or aqueous phase agent.
~80% (both relative to the product) is appropriate.

The composition of the present invention can be used as it is for controlling rice blast.
Alternatively, it can be diluted or suspended in water, etc., and applied to rice plants or the environment containing them in an amount effective for controlling rice blast.

The composition of the present invention is used for controlling blast disease occurring in Honda.

The composition of the present invention is particularly useful for controlling leaf blast.

The composition of the present invention is applied by effective means to absorb components from the lower complement and exhibit anti-rice blast effect.

The present invention herein encompasses two exemplary embodiments.

One of them is to apply the composition of the present invention in a watered state (referred to as water surface application).

) (of course, this includes the case where the water is irrigated after the treatment).

), which includes soil surface treatment, soil mixing treatment, underwater treatment, water surface treatment, etc.

In this case, the composition of the present invention is conveniently in the form of granules, such as microgranules, granules, granules, tablets, and the like.

In addition, in this specification, "one granule" refers to its size,
It is not limited by the shape, manufacturing method, etc. (for example, it includes a rod shape, a spherical shape, a cylindrical shape, an elliptical shape, an amorphous shape, a plate shape, and other shapes called tablets).

Another exemplary embodiment of the invention is
In this embodiment, the composition of the present invention is applied to a rice seedling medium for seedlings during the seedling-raising period, and in this case also, the composition is an effective means for absorbing components from the lower complement and exhibiting an anti-blast effect. Applied by.

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

The composition of the present invention is then applied to the culture medium by a method effective for distributing it as uniformly as possible in the culture medium.

These compounds and inbrothiolane are absorbed from the lower part of the complement and exhibit anti-blast effects. Therefore, if the above components are absorbed during the seedling-raising period and the components are supplied even after transplanting, they will cause the blast disease to develop. The disease control effect becomes even more certain.

In this sense, this embodiment is advantageously applied to a cultivation system in which so-called "topped seedlings" are transplanted, in which a portion of the medium is brought into the Honda together with the seedlings at the time of transplantation.

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 present invention to be in the form of granules.

Incidentally, the medium containing the active ingredient or the composition containing the same used in the present invention can be appropriately increased in amount and used for bedding or covering soil, if necessary, and is 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, substance, content of ingredients in the preparation, embodiment, etc.

Generally, for water surface application, 10
Apply at a rate of 3 to 5 kg per area.

Furthermore, when treating a rice seedling culture medium, the surface of the seedling culture medium is 1800 cWt as a granular preparation (this is because the cultivation method using a box of length 60 crIL x width 30 CIrL x height 3 cIfL is popular for seedling raising). This is a simple display in consideration of scales to which the present invention is applied to the cultivation method.

) at a rate of 50 to 75 grams per day.

In general, when transplanting young seedlings, a seedling nursery box of the size mentioned above is used.
With 18 pieces, it is possible to grow rice seedlings equivalent to 10 acres of Honda.

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 raising box has a thickness of about 2 cm.
．． 5 to 3C7 rL (the weight of the medium at this time will be approximately 2 to 3 kg).

) Therefore, when the amount of active ingredient used in the present invention is converted from the amount of granules used per medium volume, it is approximately 450 ml per medium volume.
The amount may be determined from a range of approximately 3 to 12 grams per 0 to 5400 i (total amount of components).

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, MBCP, PMP, propafos, didistone, NAC, BPMClMTMC, MIPC, PHCM
PMC, XMC, chlorzenamidine, cartap, M
O, Benthiocarb, 2.4-DP.

MCP, butachlor, chromethoxynil, molinate, IBP, cabtan, hydroxyinxazole, etc.

Next, some examples of the present invention will be shown, but the present invention is not limited to these only.

"Parts" indicate parts by weight.

Example 1 Isobrothiolane 12 parts This compound
0.5 parts calcium ligninsulfonate 2 parts clay
Mix and grind 85.5 parts well, add an appropriate amount of water (knead, use a granulator to form granules with a particle size of 0.6 to 1, for example, and dry to obtain a product.

For example, this granule is, for example, 3 to 5 k per 10 are of Honda.
(in this case, the dosage for the compound will be 15 to 25 g per 10 ares).

). In addition, for example, this granule can be used in a rice seedling box (60 mm long x
Width 301X Height 3cIrL) For example, 50 to 7 per piece
Treat the soil at a rate of 5P (in this case the dosage for the compound will be 0.25-0.3752 per box).

) Example 2 Isobrothiolane 10 parts Sodium salt dihydrate of the present compound 2.6 parts (as the present compound
2 parts polyvinyl alcohol
Part 2) Mixture of talc and clay 85
．． 4 parts are thoroughly mixed and pulverized, an appropriate amount of water is added and kneaded well, and a granule having a particle size of, for example, 0.6 to 1-I/L71L is formed using a granulator, and the product is dried to obtain a product.

For example, this granule has a dosage of 3 to 5 per 10 ares of Honda.
kg/kg (in this case, the dosage of the present compound is 60 to LOOP per 10 ares).

). For example, this granule is used to treat the soil at a rate of, for example, 50 to 75 grams per seedling box described in Example 1 (in this case, the dosage of the compound is 1 to 1.5 grams per box).
It becomes 52.

). 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 CIrL pot (equivalent to 1/10,000 are) in diameter in which paddy rice seedlings (variety Nihonbare, 5-6 leaf stage) were growing.

) was uniformly treated, placed under light conditions, and 4 days after treatment, a blast fungus spore suspension was spray inoculated, the number of lesions was investigated 4 days after inoculation, and the control value was determined according to the following formula.

1 ward triple system. A: Number of lesions in untreated area B: Number of lesions in treated area The results are shown in Table 1.

Table 1 shows that the present compounds are effective in enhancing the blast control effect of isobrothiolane.

In the judgment, the value was calculated based on the ratio of the control value of the other drug to the percentage that could not be controlled by one drug and the percentage of control by the one drug.

In addition, the results in Table 1 show that when the present compounds are blended with isobrothiolane, the blending ratio is 1 to 50%, whereas at 0.75% to inbrothiolane, the enhancing effect is not as obvious. It is shown that a remarkable enhancing effect is expressed by a ratio of 3% to 30%.

Furthermore, this result shows that although it is said that isobrothiolane alone needs to be treated 7 to 10 days before the initial onset of leaf blast, according to the present invention, the appropriate treatment period is wide even under adverse weather conditions. It has been shown that it is possible to expand the scope of the study, and that the medicinal efficacy can also be significantly enhanced.

Test example 2 Seedling box containing Kumiai granular culture soil (60Cr/L x 30
Seed fir (variety: Nipponbare) was sown in CrIL×3cIrL), and after 5 days, each box was filled with a test drug (according to the formulation of Example 1).

) at a rate of 751, and a certain section (1 crft
, XICIrL) and transplanted into 12 cTL diameter pots 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 triple system.

The results are shown in Table 2.

Claims (1)

[Claims] 1. Diisoprobyl 3-dithiolane-2-ylidene malonate and 1,2-benziisothiazole-3(2H)
1. A composition for controlling blast disease, comprising -one-1,1-dioxide or a salt thereof. 2 Diisoprobyl 3-dithiolane-2-ylidene malonate versus 1,2-benziisothiazole-3(2
H)-one-1,1-dioxide or its salt (1,
2-Benzisothiazol-3(2H)-one-1.1
The composition for controlling blast disease according to claim 1, which contains 1 to 50% (by weight) of -calculated as carbon dioxide. 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. 5 Claims 1, 2, and 3 which are granular materials
The composition for controlling blast disease according to item 1 or 4.