JPS6111202B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is based on the structural formula S-normal-butyl S'-para-
Tertiary-butylbenzyl N-3 pyridyl dithiocarboimidate (hereinafter abbreviated as compound A)
and structural formula The present invention relates to a method for preventing the decomposition of compound A and stably maintaining its quality for a long period of time in a mixed hydrating powder with N-trichloromethylthiotetrahydrophthalimide (abbreviated as captan) represented by the formula. Compound A is a fungicide that is highly effective against powdery mildew on fruit trees and vegetables. However, it is desired to formulate a mixture with Captan, which has a narrow antibacterial spectrum and a broad antibacterial spectrum. However, when mixed with Captan, Compound A
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becomes extremely unstable and cannot be put to practical use. As a result of various studies conducted by the present inventors regarding the stabilization of Compound A in the mixed wettable powder, we found that the oxidation of alkali or alkaline earth metal salts of weak acids such as carbonic acid, phosphoric acid, boric acid, and silicic acid, or of calcium or magnesium. They have discovered that by blending one or more compounds or hydroxides, it is possible to prevent the decomposition of Compound A over a long period of time without impairing the stability of Captan, thereby achieving the purpose of stabilization.
The present invention has now been completed. The amount of these additives added in the present invention is 2 to 5
% range is sufficient, but is not necessarily limited to this range. The method and effects of the present invention will be explained in detail below with reference to Examples, but the content of the present invention is not limited thereto. Note that parts represent parts by weight. Example 1 6 parts of Compound A raw material, 67 parts of Captan raw material, 5 parts of additives, 5 parts of Hymar T-450 (surfactant manufactured by Matsumoto Yushi), and 17 parts of Toxil Gu-N (white carbon manufactured by Tokuyama Soda). After mixing, the mixture is pulverized to obtain a compound A/captan (5%+60%) mixed wettable powder. This hydrating powder was placed in a glass bottle with a stopper and stored in a thermostat at 40°C for one month, and then the contents of Compound A and Captan were analyzed to determine the residual rate relative to the initial content. The results obtained are shown in Table 1.

【table】

[Table] As shown in Table 1, Compound A according to the present invention
It can be seen that the stabilizing effect of is remarkable. Furthermore, the control effects of each of the above-mentioned formulations on cucumber powdery mildew and anthracnose were examined using the following method. Kiyu cucumber powdery mildew control efficacy test Ki cucumber grown in clay pots with a diameter of 9 cm (variety:
When the plants (Kaga Setsei) reached the 3-4 leaf stage, each test preparation was diluted with water and sprayed at a rate of 10 ml per pot. Two days after spraying, cucurbit powdery mildew fungus (Sphaerotheca
fuliginea) was inoculated by spraying. Furthermore, the state of disease onset after 14 days was investigated in the following 6 stages, and the number of disease onsets was calculated using the following formula.

[Table] Anthracnose control effect test on cucumbers (variety:
When the plants (Sagami half-day) reached the 3-4 leaf stage, each test chemical was diluted with water and sprayed at a rate of 10 ml per pot. One day after spraying, Colletotrichum bacterium (Colletotrichum)
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The spore liquid of Lagenarium was inoculated by spraying. Furthermore, the state of onset of disease after 7 days was investigated in 6 stages as described above, and the severity of disease was calculated using the above formula. The results are shown in Table 2. The dilution rate was
It is 5000 times more. Therefore, the active ingredient concentration is (10 ppm of compound A + 120 ppm of captan).

【table】

[Table] As shown in Table 2, the hydrating agent according to the present invention has 40
Even after storage at ℃ for 1 month, no decrease in biological effects was observed, indicating a remarkable stabilizing effect. Example 2 6 parts of Compound A drug substance, 67 parts of Captan drug substance, 0.5 to 10 parts of additives, 5 parts of Hymar T-450 (above),
The remainder was mixed with Tokusil Gu-N (above) and finely pulverized to form Compound A Captan (5% + 60%).
%) to obtain a mixed hydrating agent. This hydrating powder was placed in a glass bottle with a stopper and stored in a thermostat at 40° C. for one month, and then the contents of Compound A and Captan were analyzed to determine the residual percentage relative to the initial content. The results obtained are shown in Table 3.

[Table] 〓〓〓〓

[Table] As shown in Table 3, the additives to be blended are 2 to 5.
It can be seen that the stabilizing effect of Compound A is remarkable. In addition, regarding each of the formulations based on the above formulations,
The control effect on cucumber powdery mildew and anthracnose was examined in the same manner as in Example 1. The results obtained are shown in Table 4.

[Table] As shown in Table 4, it can be seen that the biological effects of hydrating powders containing two or more parts of additives do not decrease even after one month at 40°C, and the stabilizing effect is remarkable. 〓〓〓〓

Claims (1)

[Claims] 1. Structural formula S-normal-butyl S'-para-
Tertiary-butylbenzyl N-3 pyridyl dithiocarboimidate and structural formula A mixed hydrating agent with N-trichloromethylthiotetrahydrophthalimide represented by is characterized by containing one or more of an alkali or alkaline earth metal salt of a weak acid or an oxide or hydroxide of calcium or magnesium. A method for stabilizing S-n-n-butyl S'-paratertiary-butylbenzyl N-3 pyridyldithioca-boimidate.