不同施氮量对冬小麦白粉病发生程度的影响

摘要

在大田条件下研究了两个小麦品种在不同氮肥水平下的白粉病发生程度,以病株率、病叶率和病情指数为统计指标表征小麦发病情况.试验结果表明,小麦高氮水平下的病株率、病叶率和病情指数要显著高于低氮水平;在相同氮肥水平下,济麦22的病株率、病叶率和病情指数均低于鲁原502.因此适当减少施氮量和选用抗性品种可以有效减轻小麦白粉病的发生.%Under the field condition,the occurring degree of powdery mildew on two wheat varieties under different nitrogen levels were studied with the diseased plant rate,diseased leaf rate and disease index as statistical indicators to characterize the incidence of wheat.The results showed that the diseased plant rate,diseased leaf rate and disease index of wheat under high nitrogen levels were significantly higher than those under low nitrogen level.Under the same nitrogen level,the diseased plant rate,diseased leaf rate and disease index of Jimai 22 were lower than those of Luyuan 502.Therefore,appropriately reducing nitrogen application amount and selecting resistant wheat varieties could effectively reduce the incidence of powdery mildew.