Zinc dithiocarbazateの殺菌作用
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In this paper the fungicidal actions of zinc dithiocarbazate and its decomposed products, such as hydrazinium dithiocarbazate, N,N^9-diaminothiurammonosulfide, thiocarbohydrazide, 2,5-dimer-capto-1,3,4-thiodiazole and hydrazine, on the anthracnose of cucumber were studied. Zineb, zinc sulfide, zinc sulfate and zinc oxide were used as a check. Zinc dithiocarbazate was much effective to control the occurrence of the anthracnose of cucumber, its protective effect was similar to that of zineb. However, the fungitoxicity of zinc dithiocarbazate in the slide germination test against Colletotrichum lagenarium was a quarter that of zineb. The contradiction between the protective effect on the anthracnose and the fungitoxicity against C. lagenarium would be illustrated from the fact that hydrazinium dithiocarbazate, a decomposed product of zinc dithiocarbazate, was more fungitoxic than zinc dithiocarbazate. The fungicidal action of zinc dithiocarbazate may be similar to that of hydrazinium dithiocarbazate and 2,5-dimercapto-1,3,4-thiodiazole, but not similar to that of the other decomposed products and zineb, considering the slopes of the dosage response curvbes. from the result of the fungitoxicity test, when added the juices of the cucumber leaves to the solution of hydrazinium dithiocarbazate, it was assumed that thiocarbohydrazide and hydrazine would be decomposed products of hydrazinium dithiocarbazate. Hydrazinium dithiocarbazate, thiocarbohydrazide and N_9N^9-diaminothiurammonosulfide were more effective than the other decomposed products to control the occurrence of the anthracnose of cucumber, and their protective effects were similar to that of zinc dithiocarbazate. Summarizing above-mentioned results, it seems to assume that zinc dithiocarbazate will be decomposed as follows and the fungitoxicity may increase resulting from the decomposition. Zinc dithiocarbazate-→hydrazinium dithiocarbazate-→thiocarbohydrazide, 2,5-dimercapto-1,3,4-thiodiazole-→N_0N^9-diaminothiurammonosulfide, hydrazine
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