夏季是黄瓜、番茄、辣椒、茄子等果类蔬菜旺盛生长季节，也是这类蔬菜易发生早衰的时期。其早衰的症状是；植株及心叶萎缩，叶片发黄．果实小而成熟晚，产量低而品质较差，严重的可导致植株过早死亡。其原因多是高温多雨或高温干旱。气温超过35℃时，植株或因发生生理干旱，或 Summer is cucumber, tomatoes, peppers, eggplant and other fruits and vegetables growing season, but also prone to premature aging of such vegetables period. The symptoms of premature aging are: plant and heart atrophy, leaves yellow. Small and mature fruit late, low yield and poor quality, serious can lead to premature plant deaths. The reason is mostly high temperature and rainy or high temperature and drought. When the temperature exceeds 35 ℃, plants or due to physiological drought, or