蚜虫是油菜、小麦重要害虫之一,油菜和小麦整个生育期都会受害。成虫、若蚜聚集在油菜、小麦的嫩叶、嫩茎上吸食汁液。受害株叶片卷曲皱缩,叶色变黄,植株矮小,生长受到抑制,甚至萎缩死亡;同时还可传播油菜病毒病。初冬和遇干旱,蚜虫繁殖快,为害重。特别是早播、早栽的油菜和小麦受害极为严重。对其安全越冬影响很大;而很多农民对蚜虫的防治容易忽视,认为入了冬,天气渐渐的冷了,蚜虫不会在为害了。其实不然,当气温降至6～7℃时,蚜虫仍能继续繁殖和危害。为保证油菜和小麦壮苗越冬,初冬仍必须重视蚜虫的防治。防治方法:1.虫情检查。入冬前,应经常深入田间进行检查,当油、麦田有蚜株率达20%左右时(即每百株有蚜虫20株左右)时,要及时用药剂防治。用药种类及用量如 Aphids are rape, one of the major pests of wheat, and rape and wheat will suffer throughout their reproductive period. Adult, if the aphid gathered in the rapeseed, young leaves of wheat, tender stems on the juice. Vicia faba leaf crimp shrinkage, leaf color yellow, short plants, growth inhibition, or even shrink death; the same time can also spread rape virus disease. Early winter and in case of drought, aphids multiply quickly, the damage. Especially the early sowing, early planting of rape and wheat are extremely serious victims. It is very influential for its safety overwintering. Many peasants easily overlook the control of aphids. They believe that when they get into the winter, the weather is getting colder and the aphids will not be harmed. In actual fact, when the temperature dropped to 6 ~ 7 ℃, the aphids can continue to reproduce and endanger. In order to ensure strong winter rapeseed and wheat seedlings, early winter still must pay attention to the prevention and treatment of aphids. Prevention and treatment methods: 1 insect inspection. Before winter, should be often in-depth inspection of the field, when the oil, wheat fields have aphid strain rate of about 20% (ie, about 100 per aphid has about 20 strains), the timely use of agents to prevent and cure. Medication types and dosage such as