JPS60161906A - Fungicidal composition for agriculture and horticulture - Google Patents

Abstract

PURPOSE:The titled composition showing improved controlling effect of long-period durability on blight and downy mildew of various crops, containing a specific pyrimidine derivative, and captafol, TNP, captan, etc. CONSTITUTION:A composition comprising (A) a compound shown by the formula (R is methyl, ethyl, aryl, or propargyl; X is O, or S) showing improved action on blight and downy mildew caused by Phycomycetes, having insufficient durable effect, and (B) (i) captafol: N-(1,1,2,2-tetrachloroethylthio)-4-cyclohexene-1,2-dicarboximide, (ii) TPN: tetrachloroisophthalonitrile, (iii) captan: N-(trichloromethylthio)-4-cyclohexene-1,2-dicarboximide or (iv) dithiocarbamate fungicide such as zinc ethylenebis(dithiocarbamate), showing preventing effect on blight and downy mildew, not being expected to have remedying effect.

Description

Detailed Description of the Invention The present invention provides one or more pyrimidine derivatives represented by the general formula (I) (wherein R represents a methyl, ethyl, aryl or propargyl group, and X represents an oxygen or sulfur atom). and Kaptapol (N-
(1,1,2,2-tetrachloroethylthio)-4-cyclohexene-1,2-dicarboxyl deprivation) (hereinafter referred to as compound (5)), TPN (tetrachloroisophthalonitrile) (hereinafter referred to as compound (I3)) ), cabtan (
N-()lichloromethylthio)-4-cyclohexene-
1,2-dicarboximide) (hereinafter referred to as compound (q))
, or dithiocarbamate fungicides, such as zineb (zinc ethylene bis(dithiocarbamate)) (hereinafter referred to as compound (to)), manneb (manganese ethylene bis(dithiocarbamate) acid) (hereinafter referred to as compound ■)), manzep (zinc, maneb complex compound) (hereinafter referred to as compound)
, Ambam (ammonium ethylenebis(dithiocarbamate)), polycarbamate (dizinc bis(dimethyldithiocarbamate)ethylenebis(dithiocarbamate)), etc. This invention relates to a sterilizing composition for agricultural and horticultural use.

Captapol, TPN, cabtane, or dithiocarbamate fungicides are widely used as agricultural and horticultural fungicides due to their excellent effects on controlling late blight and downy mildew on various crops, and have a significant contribution to increasing crop production. However, all of these drugs only show preventive effects against late blight and downy mildew, and no therapeutic effect can be expected at all.

However, when looking at the occurrence and control of various diseases in actual fields and greenhouse horticulture, chemical spraying is often done more or less after the disease has appeared, making it difficult to completely control the disease using conventional fungicides.

The present inventors have conducted extensive research in view of the above circumstances, and have discovered a pyrimidine compound that has excellent therapeutic effects on various diseases, and have filed an application (Japanese Patent Laid-Open No. 124773/1983).

The pyrimidine compounds described in the above publication have particularly excellent control effects against late blight, downy mildew, etc. of various crops caused by algal fungi, but their superior effects are only noticeable after 7 to 10 days after application. The effect was produced in a short period of time, and there was a problem with the sustained effect after that. Therefore, the present inventors continued intensive studies to solve this problem, and found that one or more pyrimidine compounds represented by the general formula (1) shown in Table 1 and captapol, TPN, cabtane, or dithiocarbamate. The present invention was completed based on the discovery that an excellent pesticidal effect can be obtained by using a mixture of fungicides and one or more fungicides.

As is clear from the test examples described below, the agricultural and horticultural fungicidal composition according to the present invention has a controlling effect on various crop diseases, and the pyrimidine compound represented by the general formula (I), captapol, TPN1 cabtane, or dithio The fungicide composition for agricultural and horticultural use according to the present invention has a high practical value as a fungicide that exhibits excellent control effects against various crop diseases. be.

The agricultural and horticultural fungicidal composition according to the present invention can be used to control diseases occurring in various crops.

For example, cucumber mildew, cucumber powdery mildew, powdery mildew, grape powdery mildew, soybean mildew, lettuce mildew, potato late blight, tomato late blight, tomato powdery mildew, tobacco late blight, green pepper late blight, etc. caused by so-called algal fungi. It can be used to control a variety of plant diseases, including those caused by insects.

Furthermore, the fungicidal composition of the present invention is practically effective against cultivated plants.
It exhibits no chemical toxicity, has extremely low toxicity to warm-blooded animals such as mice, rats, dogs, chickens, etc., and does not cause any harm in actual use.

When the fungicidal composition of the present invention is actually used, it can be used in its pure form without adding other ingredients, but it can also be used as a carrier,
and, if necessary, mixed with other adjuvants to prepare formulations commonly used as agricultural and horticultural fungicides, such as powders, wettable powders, fine granules, granules, smoke agents, and floatable agents. You can also use

The active compounds (including mixed ingredients) are generally present in said preparations.
It contains 1.0 to 95% by weight, and the appropriate amount is usually 20 f to 400 g per 10 are. Further, the concentration used is preferably in the range of 0.01% to 0.5%, but since the amount and concentration used vary depending on the dosage form, time of use, method, location, target disease, target crop, etc. There is no problem in increasing or decreasing the amount without regard to the above.

The carrier here refers to a synthetic or natural carrier that is added to agricultural and horticultural fungicides to help the active ingredient reach the area to be treated and to facilitate the storage, transportation, and handling of the active ingredient compound. means an inorganic or organic substance.

Suitable solid carriers include clays such as montmorillonite and kaolinite, inorganic substances such as diatomaceous earth, clay, talc, vermiculite, gypsum, calcium carbonate, silica gel, and ammonium sulfate, vegetable organic substances such as soybean flour, sawdust, and wheat flour; Examples include urea.

Furthermore, in order to enhance the efficacy of the compound of the present invention, the following adjuvants may be used alone or in combination depending on the purpose, taking into account the dosage form of the preparation, the application situation, etc.

In other words, anionic surfactants such as alkyl sulfates, arylsulfonic acids, succinates, polyethylene glycol alkylaryl ether sulfate salts, etc., cationic surfactants such as alkyl amines, polyoxyethylene alkyl amines, etc. Examples of activators include polyoxyethylene glycol ethers, polyoxyethylene glycol esters, polyhydric alcohol esters, and amphoteric surfactants.

Other stabilizers, fixing agents, and lubricants include isopropylhydrodiene phosphate, calcium stearate,
Examples include wax, casein lime, sodium alginate, methylcellulose, carboxymethylcellulose, gum arabic, and the like. However, these components are not limited to the above.

Furthermore, the fungicidal composition of the present invention may be used with other fungicides, insecticides, acaricides, nematicides, herbicides, plant growth regulators, etc., such as organophosphate compounds, carnocoumate compounds, thiol carbamate compounds, etc. It can also be used in combination with chemical compounds, organochlorine compounds, dinitro compounds, antibiotics, urea compounds, triazine compounds, fertilizers, etc., or as a mixture. There's nothing to do. Therefore, it is possible to control two or more types of pests at the same time, and a synergistic effect by mixing them is also expected.

Next, formulation examples and test examples will be given to clarify the usefulness of the disinfectant composition for common use in farms according to the present invention.

In addition, in the following formulation examples and test examples, compounds are indicated using the compound numbers shown in Table 1.

Formulation example 1. Wettable powder: 25 parts of sodium acid and 20 parts of sodium alkylbenzenesulfonate were uniformly ground and mixed to obtain a wettable powder having a base ingredient content of 67.5%.

Formulation example 2. Wettable powder compound (5): 250 parts, compound date: 400 parts, diatomaceous earth: 200 parts, clay: 90 parts, sodium ligninsulfonate: 25 parts, sodium alkylbenzene sulfonate: 20 parts, and polyoxyethylene nonylphenyl ether : 15 parts are uniformly pulverized and mixed to give a base ingredient content of 6.
A 5% hydrating agent was obtained.

Formulation example 3. Wettable powder compound (6): 300 parts, compound ■: 300 parts, diatomaceous earth 8250 parts, clay: 90 parts, sodium sognisulfonate = 25 parts, sodium alkylbenzene sulfonate: 20 parts, and polyoxyethylene nonylphenyl ether : 15 parts were uniformly ground and mixed to make a base ingredient content of 60
% hydration agent was obtained.

Formulation example 4. Powder compound (4): 20 parts, Compound (C): 20 parts, Calcium stearate 25 parts, Powdered silica gel: 10 parts, Cane clay: 2-1 White clay: 300 parts and Talc: 4
45 parts were uniformly pulverized and mixed to obtain a powder having a base ingredient content of 4%.

Test example 1. ) Phytophthora Phytophthora control test A tomato Phytophthora zoospore suspension was prepared and this was poured into a greenhouse.) Tomatoes grown in K (variety: World's No. 1, plant height 40 (up))
spray inoculation was carried out.

After maintaining the temperature at 17 to 19°C for 24 hours and a humidity of 95% or higher, a solution of the hydrating powder of each test compound prepared according to Formulation Example-1 diluted with water to a predetermined concentration was added to the solution at 50% per 3 pots.
Spread. After air-drying, the pots were again kept at 20° C. or lower and at high humidity, and the degree of lesion formation was examined after a predetermined period of time.

The degree of morbidity was determined for the two newly developed leaves, excluding the two leaves, and the average value was calculated for each section, and the results are shown in Table 2.

In addition, the following morbidity degree was used as an evaluation standard.

Morbidity O: Lesion area ratio 0% 1: 〃 1-5% 2: 〃 6-25% 3: 〃 26-50% 1 // 51% or more As is clear from Table 2, compound (1) ~ It was found that when either of (7) and any of the compound compounds were mixed and sprayed, a superior control effect was observed compared to when they were sprayed alone, and the long-lasting effect was also highly improved. It happened..

Table 2 Test Example 2. Cucumber root and disease control test A suspension of cucumber root and disease fungus spores was prepared and inoculated by spraying onto cucumbers (variety: Wakan half-day, 8-9 leaf stage) grown in pots in a greenhouse.

After maintaining the temperature at 17 to 19°C for 24 hours and a humidity of 95% or higher, 50 ml of a solution of the hydrating agent of each test compound prepared according to Formulation Example 2 diluted with water to a predetermined concentration was added to the solution per 3 pots. −
Spread. After air-drying, the pots were kept at a temperature of 23° C. or lower and high humidity, and the degree of lesion formation was examined after a predetermined period of time.

The disease severity shown in Test Example 1 was used as the evaluation criteria, and the disease severity was determined for all plants except for the two newly developed leaves.The average value was calculated for each plot.The results are shown in Table 3.

As is clear from Table 3, when any of compounds (1) to (7) and any of compounds (8) to [F] are mixed and sprayed, the results are superior to those when they are sprayed alone. A pest control effect was observed, and the sustained effect was significantly improved.

Table 3

Claims (1)

[Scope of Claims] One or more pyrimidine derivatives represented by the general formula (wherein R represents a methyl, ethyl, aryl or propargyl group, and X represents an oxygen or sulfur atom) and Kabutahonope TP
1. A fungicidal composition for agricultural and horticultural use, comprising one or more of N, cabtane, or dithiocarbamate fungicides.