昆虫口器构造类型很多,有咀嚼式、刺吸式、锉吸式、舐吸式、嚼吸式、虹吸式等。对作物为害较大的是咀嚼式和刺吸式。昆虫口器构造类型不同,为害作物特点(作物受害状)也不同。人们在田间常根据作物受害症状来判断害虫种类和推断作物受害程度,研究防治对策。一、咀嚼式口器害虫为害作物特点咀嚼式口器害虫种类很多,为害作物特点也各有不同。食叶性害虫把作物叶子咬成孔洞或缺刻,甚至吃成光秆。钻蛀性害虫,先在作物茎秆或果实上咬一个洞,钻到里边去为害,如玉米螟幼虫把玉米茎秆蛀伤造成折株断穗状;大豆食心虫把豆粒咬成破米状;果树上食心虫类能造成果形不 Insect mouth structure of many types, there are chewing, sucking suction, file suction, suction suction, chewing suction, siphon and so on. Larger crops are chewing and sucking suction. Insect mouth structure different types of crop damage (crop damage) are also different. People in the field often according to the symptoms of crop damage to determine the type of pests and infer the extent of crop damage, prevention and control measures to study. First, the chewing mouth pests damage crop characteristics Chewing mouthparts many pests, crop damage characteristics are also different. Leafy pests bite crops leaves into holes or nicks, and even eat into light stalks. Drilling moth pests, biting a hole in the crop stalks or fruit, drill inside to harm, such as corn borer larvae corn stalks caused broken branches broken spike-like; Fruit worms can cause fruit shape does not