JPS6019705A - Agricultural and horticultural fungicide - Google Patents

Abstract

PURPOSE:The titled fungicide showing excellent effects on main soil blights including furasium wilt, containing a specific triazole derivative and captan or difolatan, showing improved synergistic effects. CONSTITUTION:A fungicide containing a mixture of a compound such as 4-chlorobenzyl N-(2,4-dichlorophenyl)-2-(1,2,4-triazol-1-yl)ethanethioimidate, shown by the formula I (X is <=2 the same or different halogen, lower haloalkyl; Y is <=2 halogen) and captan shown by the formula II: N-(trichloromethylthio)-4- cyclohexene-1,2-dicarboximide or difolatan shown by the formula III: N-(1,1,2,2- tetrachloroethylthio)-4-cyclohexene-1,2-dicarboximide. 1pt.wt. of the former is preferably blended with 1-10pts.wt. of the latter.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel agricultural and horticultural fungicide that contains two fungicidal components having different activities. That is,
One of the triazole derivatives represented by the following general formula (I) and N-()lichloromethylthio)-4-cyclohexene-1,2-dicarboximide (cabutane) or N- (1,1,2,2-tetrachloroethylthio)-4-cyclohexene-1,2-
The present invention relates to an agricultural and horticultural fungicide characterized by containing a mixture with dicarboximide (guifortan) as an active ingredient.

General formula (I) Gyabutane 0 1 1 Difortan 1 1 However, X represents up to two identical or different halogen atoms or lower haloalkyl groups, and Y represents up to two halogen atoms.

The present inventors have demonstrated that the combination agent described in ``2'' is effective against various diseases as an agricultural and horticultural fungicide, and exhibits an excellent synergistic effect against soil diseases in particular compared to each agent alone. I found out. This compound not only shows excellent efficacy in controlling soil diseases, especially Fusarium diseases such as cucumber vine splitting disease and radish yellowing disease, which are considered difficult to control;
ium) and Rhizoctonia (Rhizoct.

It also exhibits a wide and excellent control effect against major soil diseases such as ni a).

Cabtan and difortan used as the active ingredients of the present invention are described, for example, in "Modern Pesticides Course IV" (published by Shokusen Shoten), pages 81-85, "Pesticides Handbook 1
981 Edition" (published by the Japan Plant Protection Association), pages 176 to 180. As disclosed in these documents, cabtan is a vegetable,
Suitable for spraying against diseases of fruit trees and flowers, and also used for seed disinfection. Difortan is also suitable for controlling a wide range of diseases on fruit trees and vegetables by spraying. On the other hand, the triazole derivative represented by the general formula (I) is
It is a novel compound discovered by the present inventors as described as an agricultural and horticultural fungicide in Japanese Patent No. 163409.

The agricultural and horticultural fungicide of the present invention exhibits a remarkable effect in controlling major soil diseases including Fusarium disease due to the synergistic effect of the contained active ingredients. Therefore, in order to obtain the same effect as each single agent application, the amount of control agent is reduced because it is effective at a lower concentration. In addition, although gyabutane and difortan have problems in terms of sustainability of their efficacy, the fungicide of the present invention not only can overcome this drawback, but also has the advantage that it can be expected to have a stable effect due to synergistic effects and can be applied to a wider range of situations. has.

The main diseases that can be expected to be controlled by the agricultural and horticultural fungicide of the present invention are seedling damping-off of cucumbers, Chinese cabbage, eggplant, green pepper, watermelon, radish, spinach and beet, cucumber vine splitting disease, tomato wilt and Half body wilt, clubroot of cabbage, turnip, rapeseed and Chinese cabbage, acute wilt of watermelon, crack browning of radish, wilt of radish and strawberry, root rot of konnyaku, white silk of butterbur and dive, potato It has a remarkable control effect on powdery scab of green pepper, late blight of green pepper, damping-off blight of cucumber, rhizome rot of ginger, black bruise and root rot of potato, and is effective against all crops. No drug damage was observed at all.

Typical triazole derivatives that can be used in the present invention are illustrated below. In addition, compound No.
is also referred to in the Examples and Test Examples below.

Audit 1” 4-chlorobenzyl N-(2,4-dichlorophenyl)-2-(1,2.

3,4-dichlorobenzyl N-(2,4-
N-(2,4-dichlorophenyl)-2-(1,2,4-dichlorophenyl)-2-(1,2,4-triazol-1-yl) Ethanethioimidate similar Triazol-1-yl) Ethanethioimidate 2,4-dichlorobendiJL/N-(4-chloro-2-',/')lifluoromethylphenyl)-2
-(1,2,4-triazol-1-yl)ethanethioimidate audit 1] 4-chlorobenzyl N-(2-chloro-4
-fuguorophenyl)-2-(1,2,4-)lyazol-1-yl)ethanethioimidate The blending ratio of the active ingredients in the present invention is 1 part by weight of one of the triazole derivatives of the present invention. It is appropriate to mix 0.1 to 100 parts of cabtan or difortan to the water, but the mixing ratio can be changed as appropriate depending on the conditions at the time of application and the status of disease occurrence. A more preferred ratio is 1 part of the triazole derivative to 1-10 parts of cabtane or difortan. Furthermore, the soil fungicide of the present invention has extremely low toxicity to humans and livestock, and can be used to treat crops during the growing season.

In order to fully demonstrate the excellent effects of the present invention as an agricultural and horticultural fungicide, the compound of the present invention may be formulated into emulsions, flowables (sols), wettable powders, granules, etc. according to conventional methods. Good to use.

Regarding the timing of use, soil treatment before sowing is common, but in the present invention, treatment during the growing season is also possible, and there is no need for degassing work, and crop seedlings can be planted at an appropriate time. In addition, the agricultural and horticultural fungicide of the present invention can be used with other known fungicides, insecticides,
It can also be used in combination or in combination with herbicides or growth regulators.

Next, examples of the present invention will be shown.

1 piece of wood, 210 parts of compound (parts by weight; the same applies hereinafter), 10 parts of cabtan
After putting 5 parts of white carbon, 5 parts of alkylbenzene sulfonate, and 70 parts of diatoms in a ribbon mixer and mixing them thoroughly, when controlling Atoma, dilute Kimoto-waza and use an appropriate application device. 200 to 50% in water during the growing season from before sowing or transplanting cucumbers.
It can be effectively controlled by diluting it to 1:00 and irrigating it on the soil surface at a rate of 1 to 5 doses per square meter.

1 part of compound l, 1 part of cabtan, 3 parts of white carbon
part, PAP (physical property improver) 0.5 part and diatom ±9
After putting 4.5 parts into a ribbon mixer and mixing thoroughly with an atomizer, the mixture was thoroughly mixed again with a ribbon mixer to obtain a powder containing 2% of the active ingredient.

This powder is sprayed on the soil surface at a concentration of 0.05 to 20 kg per 10 are of the active ingredient during the growing season from before sowing or transplanting using an appropriate spraying device.
By mixing well with the topsoil, beet seedling damping-off, wheat snow rot, rice seedling damping-off, cucumber standing blight, etc. can be effectively controlled.

35 parts of ``Uju'' 6 cutting compound, 75 parts of Guihorta (particle size of both compounds is 107z or less), 2 parts of lauryl sulfate, 2 parts of sodium alkylnaphthalene sulfonate, 1 part of hydroxypropyl cellulose, and A sol containing 10% of the active ingredient was prepared by uniformly mixing 75 parts of water.

If this sol is diluted 200 to 5000 times with water and applied to the soil surface at a rate of 1 to 5 IL per 1 m2 during the growing season from before sowing or transplanting of crops, it will prevent cucumber vine splitting disease and beet seedling establishment. It can effectively control diseases such as blight 1 blight, wheat snow rot, rice seedling damping-off, and cucumber standing blight.

Next, the soil disease control effect of the agricultural and horticultural fungicide of the present invention will be explained using test examples.

Cucumber Vine 1 In a field in a plastic greenhouse where cucumber vine disease is prevalent, we introduce the cucumber vine disease fungus (Fusariun oxysporum) to further intensify the disease.
A soil bran mixed medium culture of F. cucumerinum was used as an inoculum, and 100 g/m2 was inoculated and mixed well with the topsoil. Three days after inoculation, a hydrating powder prepared according to Example 1 was diluted with water and sprinkled onto the soil surface with a watering pot at a rate of 3 drops per 1 m2. One day after chemical irrigation, cucumbers (variety: Wasumi Hanshiro) were sown at a rate of 100 seeds per plot, and 30 days later, the number of bacterium damping off was investigated, and the control value (
%) was calculated.

This test was conducted in triplicate in one drug area of 0.5 m2, and the average control value (%) was determined. The results are shown in Table 1.

2 3 Table 1 Note 1) Hydroxyisoxazole is an active ingredient.
A commercially available 30% solution containing 3-hydroxy-5-methylinxazole was used.

Note 2) The numbers in parentheses indicate the seedling dieback rate in the untreated area.

L-measurement'' Entou (variety: Shirahime Entou) grown according to customary practices in a clay pot with a diameter of 14 cm filled with black volcanic ash soil.
cm, a wettable powder prepared according to Example 1 was diluted with water and irrigated onto the soil surface at a rate of 3 grammes per 1 m2. Then, after 10 days of chemical treatment, Aphanomyces root rot fungus (Aphanomyces eutaiches) was infected.
uteiches) was inoculated at a rate of about 10,000 per pot. Two weeks after the fungal inoculation, the Japanese pea plants were removed from the pots, the roots were washed with water, and disease symptoms were investigated, and the disease severity was calculated using the following formula. Based on this disease severity, the control value (%) was calculated using the following formula.

This test was conducted using 3 pots per section, and the average control value (%) was calculated.

The results are shown in Table 2.

5 Index: 0: No disease observed 1: Roots are partially browned, water-soaked 2: Most of the roots are water-soaked 3: The fist and hypocotyl parts are water-soaked 4 ...Roots rot and fall off, wither, and die 7 6 Table 2 ■ [Note 1] Hydroxyisoxazole is an active ingredient.
A commercially available 30% solution containing 3-hydroxy-5-methylinxazole was used.

Note 2) The parenthetical factor value indicates the severity of disease in the non-inoculated area.

Patent applicant: Hokuko Chemical Industry Co., Ltd. 9 30-

Claims (1)

[Claims] General formula (wherein X represents up to two same or different)\halogen atoms or lower haloalkyl group, and Y represents up to two halogen atoms. ) and N-(trichloromethylthio)-4-cyclohexene-1,2-dicarboximide or N-(1,1,
An agricultural and horticultural fungicide characterized by containing a mixture with 2,2-tetrachloroethylthio)-4-cyclohexene-1°2-dicarboximide as an active ingredient.