JPS5929166B2 - agricultural fungicides - Google Patents

Description

Detailed Description of the Invention The present invention relates to 3-allyloxy-1,2-benzisothiashield 1-dioxide (hereinafter simply abbreviated as ABID).
and 1,2,5,6-tetrahydro-4H-pyrrolo-(3
・2.1-i-j)-quinolin-4-one (hereinafter,
The present invention relates to an agricultural fungicide that contains a compound starch 1) as an active ingredient and is particularly effective in controlling rice blast disease and rice leaf blight.

In recent years, as rice cultivation methods have become more labor-saving and mechanical transplantation of young seedlings has become widespread throughout the country, major changes have appeared in the appearance of rice diseases.

In particular, the period during which rice is exposed to high temperatures during ripening has become longer than ever, and panicle blast disease, which has a direct and serious impact on rice yield and quality, is becoming more prevalent.

In addition, because rice seedlings for mechanical transplantation of young seedlings are cultivated in a dense manner under hot and humid conditions, they are susceptible to rice blast and seedling damping-off and rot caused by bacterial rice blight.

In addition, because young rice seedlings are transplanted at the 2.5-leaf stage, rice leaf blight tends to occur frequently due to initial flooding after transplanting.

However, there are few fungicides that are effective against these diseases.

Therefore, the current situation is that there is an urgent need to develop new and highly safe simultaneous control agents for these diseases.

ABID, which is one of the active ingredients of the present invention, has already been used in the
The systemic blast control agent disclosed in the specification of No. 5-38080 has extremely low toxicity to humans, livestock, fish and shellfish (
, and is a known drug that causes almost no phytotoxicity to adult rice seedlings.

Therefore, AB ID has been established as a water surface application technology in the form of granules, which leads to labor-saving control, and is currently being widely put into practical use as a specific drug against leaf blast.

Furthermore, recently, it has become known that ABID has a control activity against rice leaf blight, and various research institutes are actively investigating its practicality.

However, the control effect of ABID on rice blast when applied on the water surface is extremely noticeable on leaf blast, but it has poor residual effect, and it has a poor residual effect on rice blast and branch blast, which greatly affect the yield and quality of rice. The control effect against the disease is inferior to that of conventional spraying blast control agents.

In addition, the early disease control using rice seedlings mechanically transplanted, which has recently become widespread, is effective from the viewpoint of labor-saving and economical drug costs (approx. 1/6 of the application required after transplanting by Honda). There is a strong desire for a so-called box treatment control technique in which chemicals are applied directly to the insects.

However, with ABID's rice seedling box treatment, there have been cases of phytotoxic symptoms such as yellowing, browning, and wilting of the tips of the rice plants, and the reality is that the treatment has not yet become widespread nationwide.

In view of these circumstances, the present inventors have taken advantage of ABID's unique ability to simultaneously control rice blast and rice leaf blight, while supplementing the above-mentioned drawbacks, as well as creating a product that is highly safe from chemical damage and saves labor. Aiming to develop a practical rice disease control agent that would lead to targeted control, we tested many compounds and conducted various studies.

As a result, compound (1) known to ABID (JP-A-49
The present invention was completed based on the discovery that the above object can be fully achieved by using a sterilizing composition prepared by mixing the following:

The fungicidal composition of the present invention has an extremely excellent control effect against rice blast and rice leaf blight and safety against chemical damage that would be difficult to predict when using each agent alone, and is an unexpected drug that exhibits high synergism between the agents. This is due to the association effect.

To formulate the fungicide according to the present invention, the active ingredient and various carriers and various adjuvants used in conventional methods are added to form powders (including DL type powders), irrigation agents, liquids, flowable agents, etc.
It can be used in any desired form such as fine granules, granules, and tablets.

The blending ratio of the active ingredients in the present invention is AB I in weight ratio.
Compound I for 1 part of D! ! It is appropriate to mix 1 to 5 parts of AI), but the mixing ratio can be changed as appropriate depending on the conditions at the time of application and the status of disease occurrence.

Moreover, other fungicides, insecticides, herbicides, etc. can be mixed with the fungicide according to the present invention.

Next, examples of the sterilizing composition of the present invention will be shown.

Example 1 (Granule) Part ABIDJ (same as below 2 parts by weight), 4 parts of compound (1), 4 parts of sodium ligninsulfonate, 2 parts of lauryl sulfate, 1 part of carpoquine methyl cellulose, clay 85
Once in a mixer (mix, then pass through a grinder to finely grind.

Next, this is put into a Nigu, mixed with water, and passed through a granulator.

The granulated product is dried in a fluidized fluid dryer and then sieved through a sifter to obtain granules.

This granule is applied to rice grown in box seedlings (for mechanical transplantation of young seedlings) at a rate of 10 to 10% per box between immediately after sowing and the day of transplantation. 5
0? Sprinkle once to the recipient's address for initial control of rice blast and rice leaf blight.

On the other hand, in order to control leaf blast and rice leaf blight in rice on the day of Honda transplantation, use an appropriate granulator to apply this granule at a rate of 3 to 4 per 10 ares 4 to 10 days before the onset of the disease. Apply to water surface.

In addition, to control rice blast and rice leaf blight in the later stages of rice growth, apply 3 to 5 kg per 10 ares 15 to 30 days before heading.
Apply to the surface of the water at a rate of g.

Example 2 (Powder) 2 parts of ABID, 1.5 parts of compound (1), 0.3 parts of PAP (physical property improver), and 96.2 parts of clay were mixed in a ribbon mixer and thoroughly ground with an atomizer. After that, mix again with a ribbon mixer to obtain a powder.

This powder can be applied to the rice plant before or immediately after the outbreak of rice blast and rice leaf blight by using an appropriate spraying device at a rate of 3 to 5 per 10 ares! By dusting at a ratio of 9.9%, these diseases can be controlled individually or at the same time.

Example 3 (Powder) 2 parts of ABID, 1.5 parts of compound (1), 2 parts of 2-dimef-N-(3'-5 dichlorophenyl)cyclopropanecarboxylic acid monoamide (known compound), white 2 parts of carbon, 0.3 parts of PAP (physical property improver) and 92.2 parts of clay are mixed and pulverized in the same manner as in Example 2 to obtain a powder.

This powder can be applied to rice blast, white leaf blight, and rice ear blight at a rate of 3 to 5 kg per 10 ares on glycosides before or immediately after the outbreak of rice blast, rice leaf blight, and rice ear blight using an appropriate device. can be controlled singly or simultaneously.

Example 4 (Irrigation agent) 20 parts of ABID, 15 parts of compound (1), 5 parts of white carbon, 5 parts of lauryl sulfate, 4 parts of sodium lignin sulfonate, and 51 parts of clay were mixed in a ribbon mixer, and mixed with an atomizer. After sufficiently pulverizing, the mixture is mixed again using a ribbon mixer to obtain an irrigation agent.

This irrigation agent can be diluted 600 to 1000 times with water and sprayed using an appropriate spraying device to spray 100 to 100% per 10 ares on the complement before or immediately after the onset of rice blast disease and rice leaf blight.
By spraying at a rate of 801, these diseases can be controlled individually or simultaneously.

Example 5 (Irrigation agent) ABID 20 parts (weight parts), Compound (1) 10 parts, dithiophosphate 〇-ethyl 5-8-diphenyl (known compound) 20 parts, white carbon 13 parts, lauryl sulfate 5 parts, lignin sulfone 3 parts of acid soda and 29 parts of clay are mixed and ground in the same manner as in Example 4 to obtain a wettable powder.

This irrigation agent is diluted 500 to 1000 times with water and applied to the complement of rice blast, rice leaf blight, and rice panicle blight before or immediately after the onset of the disease at 100 to 1807 per 10 ares.
These diseases can be controlled individually or at the same time by spraying at a ratio of .

Next, the disease control effect of the fungicidal composition of the present invention will be explained using test examples.

Test Example 1 (Blast disease control effect test using box seedling-raising treatment) Dry rice (variety: Sasanishiki) was soaked and sterilized for 48 hours in a 200ml can of Benlate T wettable powder (trade name of a commercially available seed disinfectant). , Seed rice soaked for 2 days for germination was placed in a seedling box (3ocIIL x 60CIrLX3cIfL) according to general practice.
The seeds were sown in dry type 2001.

A granular soil was used as the bed soil, and after sprouting at 30'C for 2 days, cultivation was managed in a glass room.

When the true leaves reached the 25th leaf stage (June 3rd), we applied chemicals and mechanically transplanted them to Honda (planting density: 30 cIIL x 1
4CrrL).

Honda fertilizer application amount (component amount kg/10 are) is N as a base fertilizer.
, P2O5, and N20 were both 12 kg, and additional fertilizer was N10.

The test plots were divided into three rows of 15 m2 each, separated by ridges and corrugated boards.

For drug application, a predetermined amount of granules prepared according to Example 1 were uniformly scattered in seedling boxes on the day of Honda transplantation.

Cultivation management followed common practice.

The disease outbreak survey was conducted on July 29th for 40 plants in one ward, and the leaf blast lesion area ratio (%) was investigated in accordance with the implementation guidelines for pest and disease outbreak prediction projects (P87.1952, edited by the Agricultural Improvement Bureau, Ministry of Agriculture and Forestry). The control value (%) was calculated from the comparison.

A: Percentage of lesion area in untreated area The results are shown in Table 1.

(Note 1) Indicates diisopropyl 1,3-dithiolane-2-ylidenemalonate.

(Note 2) The numbers in ) are the percentage of lesion area in the untreated area (%)
shows.

Test Example 2 (Field test on rice leaf blight control effect by box application) Seedlings (2nd and 5th leaf stage) grown in boxes in the same manner as in Test Example 1 using the variety Zennanfu were mechanically transplanted to Honda on June 20th. did.

The test area consisted of three consecutive sections each measuring 15 m2, and each section was separated by ridges and corrugated boards.

The amount of fertilizer applied (component amount) was 10 kg of N, P2O2, and K20 as base fertilizer, and 10 kg of N as top fertilizer.

The chemical application was carried out in the same manner as in Test Example 1 on the day of transplantation, except that the control agent Sankel water use agent was sprayed from July 1st to September 10th using a shoulder sprayer at 1501 per 10 are.

The disease onset survey was conducted on September 30th for 40 plants in one ward, and the degree of damage was calculated using the following formula from the diseased area of the top two leaves of the longest stem of each plant, and the control value (%) was calculated from the comparison with the untreated plot. Calculated.

N: Number of leaves tested a: Diseased and dead area of tested leaves is 50% or more b:
〃 25% to 49% or more C: The diseased and dead area of the surveyed leaves is 10% to 24% or more d: The diseased and dead area of the surveyed leaves is less than 10% (Note 1) Sankel is the chemical name for nickel dimethyldithiocarbamate. (Same as Table 4)

(Note 2) The numbers in ) indicate the degree of damage in untreated areas.

Test Example 3 (Field effectiveness test of water surface application against rice blast) Dry rice (variety: Sasanishiki) was sterilized by soaking it in a 200 times solution of Benlate T hydrating agent 20 (trade name of a commercially available seed disinfectant) for 48 hours. The seedlings after soaking and germination were grown in boxes according to general practice, and mechanically transplanted to Honda at the 2.5 leaf stage (May 25th, planting density: 3QcIrLX14crfL).

Honda fertilizer application amount (component amount) is N 5.2 k as basal fertilizer.
g, P2O56.4kg, N202kg, as additional fertilizer,
On July 20th, 10 kg of N was applied.

The test plots were three consecutive plots of 15 m2 each, separated by ridges and corrugated boards.

The chemical was applied twice by hand, once at the peak of tillering (June 29) and 20 days before heading (August 1) using granules prepared in accordance with Example 1.

Furthermore, on June 20th, seedlings of old Japanese rice blast-affected by rice blast were transplanted into furrow trees in an attempt to accelerate the onset of the disease.

The disease outbreak survey will be conducted on July 25th for leaf blast at 40 locations in each ward.
As for the strain, the rice blast lesion area ratio (%) is the same as in Test Example 1.
Regarding the panicle blast, the disease severity of the panicle was investigated using the following formula on September 15th, and the control value (%) of each treated plot was calculated from comparison with the untreated plot.

N: Number of investigated panicles a: Number of necked panicles b: Number of affected panicles with 2/3 or more of the branch stalks, c: // Number of diseased panicles with 1/3 or more but less than 2/3 d
://Number of diseased panicles less than 1/3 (Note 1) IBP indicates the chemical name S-benzyl 0.0-diisopropyl phosphorothioate.

(Note 2) The numbers in ) indicate the percentage of lesion area in the untreated area.

(Note 3)) Indicates the severity of ear blast disease.

Test Example 4 (Test on the control effect of rice leaf blight by water surface application) Seeds were disinfected with Benlate T wettable powder 20 in the same manner as in Test Example 3, and rice seedlings were grown in boxes according to general practice (variety: Zennanfaze) ) seedlings at the 2.5 leaf stage were mechanically transplanted to Honda (June 23).

The amount of fertilizer applied and the area of the test plot were the same as in Test Example 3, and the chemical was applied twice: on July 1st, 8 days after transplanting, and again during the heading period (August 4th), at a rate of 4 yu per 10 ares, which was sown by hand after flooding. did.

The control agent Sankel hydrating agent was sprayed twice on July 1st and September 2nd at a rate of 4 kg per 10 are using a shoulder-type sprayer.

The heading date was September 3rd.

As in Test Example 3, the degree of disease onset was investigated for 40 plants in one area, and the control value (%) was calculated from this compared with the untreated area.

(Note 1) Values within 0 indicate disease-causing dust in the untreated area.

Claims (1)

[Claims] 13-allyloxy-1,2-benzisothiashield 1-dioxide and 1,2,5,6-tetrahydro-4
H-pyrrolo-(3.2.1-i.j)-quinoline-
An agricultural fungicide characterized by containing 4-one as an active ingredient.