Triazole control of chrysanthemum rust

Chrysanthemum rust mainly harms leaves and stems. At the beginning of the disease, light yellow spots appeared on the back of the leaves, and raised light brown or ferruginous blister appeared on the leaf surface, which was slightly sunken, and soon the blister process cracked and scattered yellowish brown powder. Warmth and high humidity are beneficial to the disease. The rainy season from April to May and the rainy weather at the end of autumn are more serious. Regular spraying of 80% Dysen zinc 500-700 times before onset can prevent the occurrence of the disease. Before the lesion is ruptured at the initial stage of the disease, 15% verapamil wettable powder 1500 times, 20% verapamil EC 400 times, 25% metalaxyl wettable powder, 5% copper wettable powder, 75% chlorothalonil wettable powder can be sprayed alternately for 3-4 times every 7-10 days. Or spray 2.5% enemy emulsifiable concentrate 4000 times, once every 20 days, 2-3 times in a row. While using chemical control, diseased leaves should also be removed or diseased plants should be removed and burned.