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高温极易引起空气干燥,增加作物水分蒸发,降低土壤墒情,出现干旱。高温干旱不仅会使果树叶片气孔不闭合,加剧枝叶水分蒸发,直接影响幼果发育,导致生理落果现象发生,而且会降低果树光合作用,增大果树呼吸强度,减少有机营养合成和积累,还常引起枝干和果实日灼,加重白粉病、叶螨、潜叶蛾等病虫危害。其防御对策如下:1.开沟施肥要注意加强肥水管理,防止落叶落果,促进果实膨大。施肥应以有机肥为主,配施少量氮素化
High temperature can easily lead to air drying, increase crop moisture evaporation, reduce soil moisture, drought. High temperature and drought will not only make the leaf stomatal closure, increase water evaporation of branches and leaves, directly affect the development of young fruit, leading to physiological fruit drop phenomenon, but also reduce the photosynthesis of fruit trees, increase the respiratory intensity of fruit trees, reduce organic synthesis and accumulation of nutrients, Cause branch and fruit sunburn, increase powdery mildew, spider mites, leaf miner and other pests and diseases hazards. The defense measures are as follows: 1. Trench ditch should pay attention to strengthening fertilizer and water management, to prevent deciduous fruit drop, promote fruit enlargement. Fertilization should be based on organic fertilizer, with a small amount of nitrogenation