Strengthen management of apple orchards During late autumn and early winter, remove dead litter completely, cut off diseased shoots and diseased branches before spring shoots, and burn them in a concentrated manner. Then carefully spray Bami 3 to 5 degrees lime sulfur to eliminate the source of overwintering disease. During the growing season, the diseased shoots, diseased leaves and diseased shoots are promptly removed, and the dense branches are timely and sparsely cut. The application of organic fertilizer, reasonable application of nitrogen fertilizer, and the application of phosphorus and potassium fertilizers make the plants grow robustly to enhance disease resistance; attention should be paid to the planting density. , strengthen ventilation and light transmission. In addition, the occurrence of virus is more related to the humidity, irrigation is best carried out in the sunny morning, the disease-prone areas should not use sprinkler irrigation to keep the leaves dry.
Chemical control Before the onset of illness, spray the protective bactericide, such as lime sulfur or 50% TB wettable powder 800 times, 75% chlorothalonil 500 times, 70% dexamethasone 400 times. After the onset of the disease, spray the systemic fungicide, use 50% carbendazim wettable powder 500 times, 70% thiophanate-methyl wettable powder 800 times. When the disease occurs, 25% triadimefon can be sprayed with 800 times solution. When the disease is severe, it is sprayed once every 10 to 15 days and sprayed continuously 2 or 3 times. Different agents should be used alternately, but thiophanate-methyl and carbendazim should be used interchangeably. They should not be used interchangeably because they have cross-resistance. The effect of zeocin is worse than that of other drugs, but it is not easy to produce resistance.
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