High temperature and rain prevention and control of apple brown spot

Apple brown spot is a traditional leaf disease that seriously affects fruit yield and quality. Its occurrence and prevalence are related to rain, tree vigor, and cultivation and management. Rainy weather is the main condition of the epidemic. In summer and rainy years, the incidence is often early and heavy. At higher temperatures, the disease spreads rapidly. Poor management, frequent use of drugs after bagging, low-lying, poor drainage, canopy closure, and poor ventilation are common. The lower part of the canopy of the crown is earlier and heavier than the upper part of the leaves. The field originated from May to June, and entered the peak period from July to August.

Control methods: First, we must rationally trim, pay attention to drainage, and improve ventilation and light conditions in the park. Second, in the autumn and winter, the fallen leaves and diseased branches and diseased leaves in the orchard should be cleaned, buried or burned. The third is spray protection, generally began in mid-May spraying, every 15 days 1 time, a total of 3 to 4 times. The fourth is the alternating use of protective agents and systemic therapeutic agents. Specifically, pre-rain spray protective long-term, strong adherent protective bactericide protection, 6,7,8 each spray Bordeaux liquid or other long-term protective agent. Spray the therapeutic agent after the rain and spray the protective agent. If there is more rain, spray the therapeutic agent twice between the two protective agents; if there is more rain before and after the bagging, spray the first time before the fungicide First spray a therapeutic agent, triazole fungicide has an ideal therapeutic effect on brown spot, such as tebuconazole, propiconazole, fluorosiliconazole, etc.; methoxy acrylate fungicides, such as pyrazole Pyrazloxacin also has a good therapeutic effect on brown spot, but azoxystrobin is used for cultivars such as barramundi, and should be avoided. Other commonly used pharmaceuticals are: Bordeaux mixture (1:2:200), 30% green detox 500 times, 77% can kill 800 times, 70% thiophanate-methyl WP 800 times, 70% Manganese zinc wettable powder 500 times, 75% chlorothalonil wettable powder 800 times and so on. Note that spray Bordeaux prior to bagging is prone to fruit rust and should be used after bagging.

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