麦田草害是制约小麦产量的重要因素之一,一般造成减产10％～30％,甚至更高,特别是由于草害的发生,严重影响小麦的品质,使其千粒重降低,品质低劣。在近年的生产上,草害发生呈现以下特点:一是杂草种类多群落大。据我们调查,危害我县的麦田杂草多达10余科40余种,一般发生密度为500—800株/平方米,高者达1000株以上。二是蔓延快,发生面积逐年扩大。多种杂草混生,给防治带来一定困难。三是农民对防除草害未能高度重视,时机把握不准,用药不对路,方法欠当,结果造成防效不理想。 Wheat field grass damage is one of the important factors restricting wheat yield, generally resulting in 10% to 30% cut, or even higher, especially due to the occurrence of grass damage, seriously affecting the quality of wheat, so that its 1000-grain weight, poor quality. In recent years, the production of grass damage occurs the following characteristics: First, large weed species community. According to our investigation, more than 40 species of wheat weeds in the county are harmed. The density is 500-800 plants per square meter and the highest one is more than 1,000 plants. Second, spread quickly, the area has expanded each year. Mixed with a variety of weeds, prevention and treatment to bring some difficulties. Third, peasants have failed to attach great importance to the prevention and control of grass and weeds, the timing is not controlled, the medicines are not properly used and the methods are not properly followed, resulting in unsatisfactory results.