麦蚜分布极广,可危害多种禾本科作物。从小麦苗期到乳熟期都可危害,刺吸小麦汁液,造成严重减产,麦蚜还可传播小麦黄矮病病毒,是小麦的主要害虫。1形态特征1.1麦二叉蚜。成蚜椭圆形或卵圆形,体长1.5～2毫米,无翅雌蚜和有翅雌蚜体均为淡绿色或绿色,腹部中央有一深绿色纵纹,腹管圆筒形,长0.25毫米,触角比体短,有翅雌蚜的前翅中脉分为二叉。 Wheat aphids are widely distributed and can be harmful to many gramineous crops. Wheat can be harmed from the seedling stage to the milking stage, causing the wheat juice to spit and cause serious cuts. The wheat aphid can also transmit wheat yellow dwarf virus and is the major pest of wheat. 1 Morphological characteristics 1.1 Wheat aphids. Aphids oval or oval, body length 1.5 ~ 2 mm, winged female aphids and winged female aphids are light green or green, abdomen has a central dark green vertical stripes, abdominal tube cylindrical, length 0.25 mm , Antennae shorter than the body, winged females in the fore wing midrib is divided into two.