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Answer: First, combine pruning in the summer or in the whole growing season, and cut off the diseased shoots completely, remove the diseased fruits and diseased leaves, and thoroughly clean up the litter after pruning in the autumn, and then burn them deeply to bury them deeply. This can minimize the source of bacteria. Secondly, it is necessary to increase potassium fertilizer to prevent plant growth, increase tree vigor, and increase resistance to disease. The plane should be reasonable and maintain good ventilation and light transmission conditions. The third is to spray 200 times solution of sodium pentachlorophenol, or 3 to 5 degrees of Baume Dendrobium mixture before sprouting in the spring; the growth period is sprayed once before and after flowering 1:0.5:200~240 Bordeaux fluid, other agents are 75% chlorothalonil 500 times, or 50% carbendazim 1000 times.