JPH0940513A - Agricultural fungicide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a new agricultural fungicide produced by combining chemicals which are individually known as agricultural fungicide by itself and exhibiting excellent effect unattainable by the single use of the chemicals. SOLUTION: This agricultural fungicide is produced by mixing 4,5,6,7- tetrachlorophthalide (fthalide) of formula I with 1-N-propyl-N[2-(2,4,6- trichlorophenoxy)ethyl] carbamoylimidazole (prochloraz). The amount of the prochloraz in the fungicide is preferably about 0.25-4.0 pts.wt. based on 1 pt.wt. of the fthalide. The agricultural fungicide has high safety to man, animal and fish and is free from phytotoxicity to useful crops. The agricultural fungicide preparation generally contains both active components in an amount of 1.0-95.0% in total. It is applied usually at a rate of 15-60g in terms of the sum of both active components to 10 are.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to agricultural fungicides.

[0002]

2. Description of the Related Art Up to now, many agricultural fungicides have been developed and used. 4, 5 used in the present invention
6,7-Tetrachlorophthalide and 1-N-propyl
-N- [2 (2,4,6-trichlorophenoxy) ethyl] carbamoylimidazole has already been used alone as an agricultural fungicide.

[0003]

The object of the present invention is to use agricultural chemical sterilizers having excellent effects that cannot be exhibited independently by mixing and using the agents that are themselves used as agricultural bactericides. To provide an agent composition.

[0004]

[Means for Solving the Problems] 4,5,6,7-tetrachlorophthalide is

[0005]

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It is a compound represented by the following chemical formula, and is widely used as a rice blast control agent under the general name of fthalide. This fusaride is highly safe against human livestock and fish and shellfish, and has an excellent preventive effect, and it is one of the most commonly used agents for controlling blast disease on the market.
However, the action of fusaride in controlling blast is limited to the preventive effect. Therefore, even if the fusaride is sprayed on the rice body after infection with the blast fungus, the effect is not exhibited.

On the other hand, 1-N-propyl-N- [2 (2,2
4,6-Trichlorophenoxy) ethyl] carbamoylimidazole is

[0008]

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It is represented by the chemical formula, prochloraz (proc
It is widely used as a rice seed disinfectant under the general name (hloraz), but has not yet been used as a direct spraying agent on rice. However, the present inventor has surprisingly found that direct spraying on rice bodies in greenhouses and fields shows remarkable preventive and therapeutic effects against rice blast.

The present inventor has conducted diligent research on the combined use of other drugs with prochloraz in order to make up for the drawback of having no therapeutic effect while taking advantage of the excellent preventive effect of fusaride against rice blast disease. The present invention has been completed by finding that a remarkable synergistic effect is exhibited against blast disease. The agricultural fungicide of the present invention that uses both of the above agents in combination exhibits a very high control effect against rice blast, in particular, and the effect has a high synergistic effect that was not expected from the single-use spraying effect of each component. Demonstrate. The effect has not only a preventive effect but also a very excellent therapeutic effect, and the amount of both agents used can be greatly reduced compared with that of using a single agent. The agricultural fungicide of the present invention is also effective in preventing rice blast disease, such as rice blast disease (sesame leaf blight, etc.) and rice scab.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The mixing ratio of fthalide and prochloraz in the agricultural fungicide of the present invention can be 0.25 to 4.0 parts by weight of Cloplus with respect to 1 part by weight of fthalide. Suitably 0.5 to 1 weight of fusaride
2.0, and more preferably 0.6 to 1.3 parts by weight.

The agricultural fungicide of the present invention can be prepared by any conventionally known formulation method, for example, powders, granules, powder granules,
Preparations such as granules, wettable powders, suspensions, oils, aerosols and flowables can be made. As an auxiliary agent for making these preparations, for example, diatomaceous earth, slaked lime, calcium carbonate, talc, white carbon, kaolin, bentonite, solid carriers such as sigleite, toluene, xylene, solvent naphtha, ethanol, dioxane, acetone. , Isophorone, methyl isobutyl ketone, dimethylformamide, dimethyl sulfoxide, N-methyl-2
-Solvents such as pyrrolidone, sodium alkyl sulfate, sodium alkylbenzene sulfonate, sodium lignin sulfonate, polyoxyethylene glycol alkyl ether,
Examples thereof include spreading agents such as polyoxyethylene lauryl ether, polyoxyethylene alkylaryl ether, polyoxyethylene sorbitan fatty acid ester, and surfactants.

The agricultural fungicide of the present invention exhibits a high level of safety for humans, animals and fish, and there is no fear of chemical damage to useful crops. It goes without saying that the agricultural fungicide of the present invention can be used in combination with other fungicides, insecticides, herbicides, plant growth regulators and the like. The agricultural fungicide formulation of the present invention generally has a total amount of both active ingredients of 1.0 to 9
Contains 5.0% active ingredient, preferably 3.0-70% active ingredient. The application amount is usually 15 to 60 g, particularly preferably 25 to 40 g, as the total amount of both active ingredients per 10 are.

The production examples of the agricultural fungicide of the present invention are illustrated below.

[0015]

【Example】

Production Example 1 [powder (driftless powder)] 1.5 parts by weight of prochloraz, 1.5 parts by weight of phthalide,
1.0 parts by weight of Hofyte carbon, 0.5 parts by weight of Drilless B and 95.5 parts by weight of clay were uniformly mixed to obtain a powder.

Production Example 2 [Wettable Powder] Prochloraz 15.0 parts by weight, Fthalide 15.0 parts by weight, sodium ligninsulfonate 5.0 parts by weight, white carbon 15.0 parts by weight and kaolin 50.0 parts by weight. The mixture was uniformly mixed to obtain a wettable powder. Production Example 3 [Granule] Prochloraz 1.5 parts by weight, Fusalide 1.5 parts by weight,
Bentonite (30.0 parts by weight) and clay (67.0 parts by weight) were uniformly mixed and made into granules by a conventional method.

The effects of the agricultural fungicide of the present invention on rice blast disease will be shown below by test examples. Test Example 1 Impotent disease control effect test A preventive effect test and a therapeutic effect test were carried out using seedlings of rice (species: Nihonbare) cultivated in soil in the 3-4 leaf stage in a plastic pot having a diameter of 9 cm.

The chemicals used in the test were commercial products, fusalide: 20% wettable powder (sol), and prochloraz: 25% emulsion. For the chemical spraying, the above commercial product was diluted to a predetermined concentration and sprayed on the turntable with a spray gun at a rate of 30 ml per 3 pots. The pathogen was inoculated by spraying with a spore suspension (5-6 × 10 ⁶ / ml) of rice blast fungus (Pyricularia oryzae) obtained from a rice seedling that had been previously infected.

In the preventive effect test, one day after spraying the drug, the pathogen was inoculated and left in a humid chamber at 25 ° C. ± 2 ° C. for 24 hours and then transferred to a glass greenhouse to cause disease. In the therapeutic effect test, the drug was sprayed in the same manner as above, 24 hours after the inoculation of the pathogen. After that, it was transferred to a glass greenhouse to cause the disease as in the preventive effect test.
In the disease onset survey, both the preventive effect and the therapeutic effect test were expressed as% with the degree of disease of the entire rice plant in the pot 7 days after the inoculation of the pathogenic bacteria.

[0020] Test results 1. Preventive effect Test area Drug spray concentration (ppmai) Control value ──────────────────────────────────── Single 25 25 67 Fusaride 50 75 100 100 98 200 100 ─────────────────────────────── 25 25 Prochloraz 50 42 42 100 67 ─ ─────────────────────────────────── Mixed use Prochloraz 25 + 25 (1: 1) 94 + Fusaride 50 + 50 (1 1) 94 (mixed ratio) ───────────────────── 25 + 50 (1: 2) 88 50 + 100 (1: 2) 100 100 + 200 (1: 2) 98 ────────────────────── 25+ 38 (2: 3) 98 50 + 75 (2: 3) 100 100 + 150 (2: 3) 99 ────────────────────── 38 + 25 (3: 2) 95 75 + 50 (3: 2) 99 100 + 100 (3: 3) 100 ──────────────────────────────────── Non-scattering area 80% Damage ──── ──────────────────────────────── Test results 2. Therapeutic effect Test area Drug spray concentration (ppm ai) Control value ──────────────────────────────────── Single District 16 0 Fusalide 32 0 64 0 125 0 ─────────────────────────────── 32 100 Prochloraz 64 100 100 125 100 ─ ─────────────────────────────────── Mixed mixed area Prochloraz 16 + 32 100 + Fusaride 32 + 32 100 64 + 32 100 125 + 32 100 16 + 64 100 32 + 64 100 64 + 64 100 16 + 125 100 32 + 125 100 64 + 125 100 ───────────────────────────────────── Untreated area 80 % Damage ──── ─────────────────────────────── Test Example 2 Rice blast control test of rice blast disease rice seed (variety: Nihonbare) The seedlings were sown in the field according to the control test method described in 1.

In order to promote the occurrence of the disease and make it uniform, the leaves of the diseased bacteria were cut into about 1 cm as an infectious source, and the whole seedlings in the test field were sown as an inoculum source. This made it possible to constantly infect rice in the field Naeyo. For the drug spraying, the prescribed concentration of each reagent agent prepared according to Test Example 1 was applied to one section (1 cm ² ,
It was sprayed twice with a small sprayer at 100 ml per 3 times).

The first spraying was carried out at the 3-4th leaf stage when the initial lesions began to appear in 2-3 leaves, and the second spraying was carried out 7 times after the first spraying. Onset of disease is 2 days after the first application
Immediately before the first spraying (first time), 2 days after the second spraying (second time) and 8 days after the second spraying (third time), the control effect of each drug was examined.

As the investigation method, the degree of damage (%) caused by rice blast in each treatment area was investigated, and the control value (%) of each drug was calculated by the following formula. Test result 3 Control value Test area Drug spray concentration (ppmai) 1st 2nd 3rd ─────────────────────────────── ───── Single use 100 22 0 7 Fusalide 150 50 50 17 11 200 39 39 26 26 ────────────────────────────── ── 150 22 26 30 30 Prochloraz 200 444 43 52 250 44 39 39 48 ─────────────────────────────────── Mixed Ward Prochloraz 100 + 100 56 48 67 67 + Fusalide 100 + 150 72 65 65 67 100 + 200 72 70 85 85 100 + 250 83 74 74 89 150 + 100 78 65 74 74 150 + 150 78 78 85 85 150 + 200 78 70 70 91 150 + 250 1 78 91 ─────────────────────────────────── Control group Caslab wettable powder (sol) 12 + 150 67 65 67 (Kasugamycin 1.2% + Fusalide 15%) ─────────────────────────────────── Untreated plot Damage rate %% 77% 90% ────────────────────────────────────

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[Procedure amendment]

[Submission date] July 23, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

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Claims (1)

[Claims] 1. An agricultural product containing 4,5,6,7-tetrachlorophthalide and 1-N-propyl-N- [2 (2,4,6-trichlorophenoxy) ethyl] carbamoyl chloride as active ingredients. Fungicide.