noxia in winter wheat field, and Aphelinus albipodus, Aphid-ius picicpes and Leucopis annulipes were key natural enemies in spring wheat field.

• 影响春麦田麦双尾蚜数量的天敌主要有白足蚜小蜂Aphelinus albipodus、燕麦蚜茧蜂Aphidius picipes和环足灰斑腹蝇Leucopis annulipes等。