It is forbidden to purchase seedlings and scion in the ward, and quarantine the seedlings to prevent human transmission. When the diseased leaves are removed in time, when the diseased leaves are inconveniently removed or incompletely removed, the soil is plowed before the budding of the apple in the spring of the second year, and the diseased leaves are buried, or the sodium pentachlorophenol is sprayed 200 times. Spray protection during the growth period is best sprayed 1:2 to 3:160 Bordeaux mixture at the flowering stage of the early maturing cultivar and sprayed every 15 days. A total of 5 sprays were used to ensure that the leaves were evenly coated with fruit.