Cherry leaf spot symptoms
The disease is mainly harmful to the leaves, but also to the petiole and fruit. In the early stage of the leaf, purple or brown necrotic spots were formed between the frontal veins of the leaves, and pink mildew was formed on the back of the spots. Later, as the spots expanded, the number of spots combined to cause most of the leaves to die. Sometimes the leaves also form perforations, causing the leaves to fall off early. The leaves generally begin to develop in May, and the incidence is severe during the hot and rainy months of the month.
Pathogen and occurrence of cherry leaf spot
The disease is caused by a fungus infection. The pathogens overwinter on the diseased leaves with ascospores. In the second year, conidia are produced in the Spring for initial infection and reinfection. Generally, it can be diagnosed in April, and the rainy season in June is the peak period. Where the orchard is extensively managed, the drainage is poor, and the incidence of canopy closure is heavier.
Cherry leaf spot prevention and treatment method
1 Reduce the source of infection: combine winter pruning, remove litter, cut off diseased branches, and destroy them centrally.
2 Strengthen management, increase the application of organic fertilizer and phosphorus, potassium, timely irrigation, especially in the dry season, in order to improve plant disease resistance, control the incidence of disease. Suitable for trees, cherry trees planted to avoid sockets.
3 chemical control: cherry germination spray 1:1: 160 Bordeaux liquid stone sulfur mixture 2-3 wave US to prevent infection. The incidence is sprayed with 65% dasen zinc wettable powder 500-800 times solution, or 70% methyl thiophanate wettable powder 800-1000 times solution. Spray every 3-5 days and spray 2-3 times.
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