麦蚜是麦田普遍发生的重要害虫。我省主要有麦长管蚜、麦二叉蚜和禾谷缢管蚜三种。其为害方式是刺吸汁液,造成麦苗黄弱;在“黄矮”流行区还是传毒媒介。抽穗灌浆期,条件适宜,麦蚜繁殖迅速,群体密度猛增,多集中在旗叶和穗码为害。造成千粒重降低,影响产量。1979—1980年,我校农场以人工控制蚜量的方法,测定小麦穗期不 Wheat aphid is a common pest in wheat fields. In our province, there are mainly three kinds of wheat aphid, wheat aphid and cereal aphid. The damage method is sucking juice, resulting in weak yellow wheat seedlings; in the “yellow dwarf” epidemic area or the transmission medium. During the heading stage, the conditions were favorable, the wheat aphid propagated rapidly and population density increased sharply, mostly concentrated in flag leaf and spike code. Resulting in reduced grain weight, affecting output. 1979-1980, my school farm to control the amount of aphid by the method of determination of wheat is not the eagle