苹果黄蚜是我地区苹果树的主要害虫。该虫以成虫和若虫群集在寄主的嫩芽、嫩梢和嫩叶背面，刺吸汁液。受害叶片的叶尖向背面核卷，影响光合作用，抑制新梢生长，严重时可引起初夏落叶。1996年以前，我们一直用40％的氧化乐果防治，但虫体已产生抗性，加之防治的最佳时期掌握不 Apple yellow aphid is the main pest of apple tree in my area. The worm to adult and nymphs clustered in the host’s shoots, tender shoots and young leaves on the back, sucking juice. Affected leaves tip to the back of the nuclear volume, affecting photosynthesis, inhibition of shoot growth, serious can cause early summer leaves. Before 1996, we had been using 40% of omethoate for control, but the parasites had developed resistance, together with the best period of control