JPS6039243B2 - Fungicide for agriculture and horticulture - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an agricultural and horticultural fungicide containing N-penzoyl-N'-(2,2,2-trifluoroethylidene)hydrazine represented by formula (1).

The compound of formula (1) is a known substance, Chemtech Abstracts 82 1121
12 (1975) describes its synthesis method.

However, this report only discloses a method for synthesizing the compound of formula (1) as a reaction intermediate, and makes no mention of its use as an agricultural or horticultural fungicide or its bactericidal action. As a result of extensive screening of various synthetic compounds, the present inventor found that the compound of formula (1) has excellent bactericidal activity, and has completed the present invention.

This compound can be advantageously used alone or in the form of a powder, wettable powder, emulsion, liquid, etc. by mixing with a carrier (diluent).

It is of course preferable to add auxiliary agents such as spreading agents, emulsifiers, wetting agents, and fixing agents to the agricultural and horticultural disease control agent of the present invention, if necessary, to ensure its effectiveness.

In addition, even when mixed with other chemicals, there is no risk of decomposition or deterioration of the chemical itself, and there is no risk of degrading or deteriorating the other chemicals, so it should not be used in combination or in combination with other fungicides, insecticides, fertilizers, etc. You can also do it. Next, some examples regarding the composition of the disinfectant of the present invention will be illustrated, but the constant (diluent), the auxiliary agent, the mixing ratio thereof, the concentration of the active ingredient, etc. may be varied within a wide range.

Example 1 powder Use by mixing, crushing and sprinkling.

Example 2 hydrating agent Mix and grind and use as a wettable powder and dilute with water.

Next, some biological test examples showing the excellent bactericidal efficacy of the compounds of the present invention are described below. Test Example 1 Rice blast control effect test by pot test The wettable powder of the present invention of Example 2 was added to paddy rice seedlings (variety: Sasazen) at the true four-leaf stage grown in clay pots with a diameter of 10 cm with water to a predetermined concentration. It was diluted and suspended and sprayed so that the leaves were sufficiently wet.

After drying the leaves, a spore suspension of blast fungus was spray inoculated, and 27
The temperature conditions were maintained at ~28 oo. Top 1 after 4 days of vaccination
The number of lesions was investigated for leaves/plant, 20 plants/pot, and 3 pots/treatment, and the suppression rate was calculated using the following formula. Suppression rate (%): (・
- Total number of wing haze lesions in non-treated plots) X・00 results are shown in Table 1.

Table 1 Test Example 2 Rice Sesame Leaf Blight Effect Test A predetermined concentration of the wettable powder of the present invention in Example 2 was applied to paddy rice seedlings (variety: Sasanishiki) at the true four-leaf stage, which were cultured in clay pots with a diameter of 10 cm. It was diluted and suspended in water and sprayed so that the leaves were sufficiently wet.

After drying the leaf surface, a spore suspension of rice sesame leaf blight was inoculated with a mist.
27 to 28,000 and maintained at high temperature conditions. After the 4th inoculation, the number of lesions was investigated for 1 upper expanded leaf/plant, 16 leaves/pot, and 3 pots/treatment, and the suppression rate was calculated using the following formula. Suppression rate (%) = (・-Total number of smoke-filled wing spots in non-treated areas)
・The results are shown in Table 2.

Table 2 Test Example 3 Mildew Downy Mildew Control Effect Test Kiyuuri leaves (variety: Sagami Hanshiro, 1 sown/pot, 3 pots/ The wettable powder of the present invention of Example 2 was diluted and suspended in water to a predetermined concentration and sprayed on the treated area.

After spraying and drying the leaves, the spore liquid of downy mildew collected from the confirmed diseased leaves was spray-inoculated, and the plants were exposed to 22 to 23 qo high temperature conditions for 2 days.
After that, I left it in a greenhouse. Five days after inoculation, the disease severity was investigated for 1 leaf/pot and 3 pots/treatment according to the following investigation criteria, and the results were expressed as the average disease severity per leaf. Investigation criteria: Degree of certainty The results of the degree of disease onset are shown in Table 3.

Table 3 Test Example 4 Tomato late blight control effect test Conducted on 4-leaf stage tomato seedlings (variety: Fukuju No. 2, 1 plant/pot, 3 pots/treated area used) grown in clay pots with a diameter of 10. The Sailor Zero agent of the present invention of Example 2 was diluted and suspended in water to a predetermined concentration and then sprayed.

After the sprayed leaves had dried, a suspension of Phytophthora spores that had been cultured in advance on potato tubers was spray inoculated onto the tomato leaves that had been sprayed with the chemical, and the leaves were incubated for 2 days.
After keeping the temperature in the greenhouse at 0 to 20, the plants were left in the greenhouse. Four days after inoculation, the degree of disease was investigated using the same investigation criteria as in Test Example 3 and expressed as the average degree of disease per plant. The results are shown in Table 4.

Table 4 Test Example 5 Wheat Seishin disease control effect test The seeds of Example 2 were applied to seedling wheat (variety: Norin No. 64, 16 plants/pot) at the third true leaf stage grown using clay pots with a diameter of 10 skins. The invention wettable powder was diluted and suspended in water to a predetermined concentration and then sprayed.

After spraying and drying the leaves, the spore liquid of the wheat strain fungus collected from the camellia diseased leaves was spray inoculated and kept under high humidity conditions of 20 to 25 oo. Thereafter, the plants were left in a glass greenhouse, and after 7 days, the degree of confirmed disease was investigated for 10 plants according to the following investigation criteria, and the degree of disease was determined by the average degree of disease per leaf. Investigation criteria: Degree of certainty The severity of the disease is shown in Table 5.

Table 5 Test Example 6 Kiyuuri Botrytis Gray Mold Control Effect Test Kiyuuri leaves at the second true leaf stage grown using 10 fox clay pots (variety: Sagami Hanshiro, 1 raked/pot, 3 pots/ The wettable powder of the present invention of Example 2 was diluted and suspended in water to a predetermined concentration and then sprayed on the treated area.

After drying the sprayed leaves, a circular section of agar containing gray mold fungi that had been cultured for 5 days at 20°C using potato rut juice agar to which wisteria sugar had been added was sprayed with a chemical solution. , inoculate the diseased bacteria directly on the central part, and keep it for 22 days for 5 days after inoculation.
After the plants were kept in a greenhouse at 2,300 °C, the degree of disease onset was investigated according to the following investigation criteria and expressed as an average degree of disease. Investigation criteria: Degree of certainty The results of the degree of disease onset are shown in Table 6.

Table 6 Test Example 7 Grape downy mildew control effect test The wettable powder of the present invention of Example 2 was diluted and suspended in water to a predetermined concentration on a pot-shield grape seedling (variety: Koshu), and the top and bottom of the leaves were thoroughly coated. I sprayed it so that it was wet and left it in the vinyl house.

After 4th day, cut the leaves from the sprayed trees and inoculate them with a spore suspension of downy mildew bacteria collected from the confirmed diseased leaves.
Causes disease under high temperature conditions.

10 days after inoculation, the degree of fertilization disease was investigated on 3 leaves/plot according to the following investigation criteria and expressed as the average degree of fertilization disease per leaf. Investigation criteria: Disease severity The disease severity results are shown in Table 7.

Table 7

Claims (1)

[Claims] 1. An agricultural and horticultural fungicide containing N-benzoyl-N'(2,2,2-trifluoroethylidene)hydrazine represented by the following formula: ▲Mathematical formula, chemical formula, table, etc.▼