Silver Pharisee can effectively control watermelon blight

Watermelon blight can harm the leaves, vines and fruits, and form water-soaked lesions in the diseased part, causing the leaves and fruits to rot and the plants to die. Severe in rainy season and high temperature and high humidity conditions. There are many pharmaceutical agents that can be used to control the disease in production, but the effects are not ideal. In order to seek a better control agent, Dai Weiguang and others from Jinhua Academy of Agricultural Sciences in Zhejiang Province conducted an agent screening test.

Silverfali (68.75% fluopicofen-5propoxime hydrochloride suspension), 50% fluomac manganese zinc wettable powder, 80% ethylphosphine aluminum wettable powder, and Kelu (72% creamulose)é”° Manganese zinc wettable powder) and other four kinds of agents, respectively, 50, 60, 75 ml silver fertilizer, 50% fluorine, manganese zinc, 50 grams, 75 grams grams, 80% phosphine aluminum 70 grams, in the In the early stages of the outbreak of the watermelon disease, spray was sprayed once every 7 days for a total of 3 injections.

The test data showed that 50, 60, and 75 milliliters of silver were used per acre, and the efficacy of one dose of medication was 51.8%, 66.7%, and 71%, respectively; the control efficacy of medication was 72.9%, 78.5%, and 87.4%, respectively; The control effect after 10 times for 3 times was 80.9%, 86.5% and 91.7%, respectively, and there was no significant difference between the treatments. The control effect of the latter two doses was significantly better than that of the other 3 agents, and the silver method was used per acre. 50 ml control efficacy is equivalent to 50 g per mu with 50% Fluorine Manganese Zinc WP 50 g, which is significantly better than the control effect of 75 g per mu, which is significantly better than 80% per mu. Ethylphosphine aluminum wettable powder 70 grams of control effect.

The test results showed that before or during the occurrence of the watermelon disease epidemic, 50-60 ml of silver was sprayed per acre, sprayed once every 7-10 days, and used once every two to three times to effectively control the occurrence or spread of the disease. Long duration, safe for watermelons.

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