果树夏季的病害主要为梨黑星病、李杏流胶病和葡萄黑豆病等。黑星病:是梨和苹果树的主要病害之一,为害新梢、叶片、果实和果梗等。防治方法:①清除病原:及时清除病果、落叶。②加强管理:去除过密的内膛枝,疏除外围过密、过旺、直立生长的枝条,以改善通风透光条件。③药剂防治:发病前喷施 The diseases of fruit trees in summer are pear scab, Li Xingyu gum disease and grapes black bean disease. Scab: It is one of the major diseases of pear and apple trees, damaging shoots, leaves, fruits and fruit stems. Prevention and treatment methods: ① clear pathogen: timely removal of disease and fruit, leaves. ② strengthen management: removal of the dense inner borer branches, thinning out the periphery of the dense, too busy, upright branches to improve the ventilation and light conditions. ③ drug control: spraying before onset