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This paper studies the Huangguogan anthracnose infected time and different concentration of 25% Pyraclostrobin EC (1500, 2000, 2500 times) in Huangguogan in different periods (before flowering, after flowering, young fruit period, fruit rapid growth period) control effect on Huangguogan anthracnose after application. The results showed that the best control effect on anthracnose of Huangguogan was after anthesis. Among them, the control effect of 2000 times 25% Pyraclostrobin EC was the best, and the control effect reached 53%. However, the control effect of 2500 times 25% Pyraclostrobin EC before flowering was the worst only 21.4%. Therefore, through the comprehensive analysis of field control results obtained after flowering for the prevention and treatment of Huangguogan anthracnose period is the optimum control period. Huangguogan anthracnose infected time during after flowering to fruit period.

Research of Huangguogan anthracnose infection time and optimum control period