我市麦田杂草长期以来一直以藜、葎草为主,化学除草主要应用2,4-D 丁酯,由于2,4—D 丁酯的长期使用,杂草的抗药性有明显增强,2,4—D 丁酯用量从70年代的每亩30毫升,上升到现在的每亩50毫升甚至75毫升。一些抗性群落也相继出现,如:播娘蒿、麦瓶草、离子草、麦家公、野燕麦、卷茎蓼等。这些杂草生命力强,繁殖量大,对小麦危害严重。如麦瓶草最高每平方米达1800多株,造成小麦减产70%以上,卷茎蓼每平方米达300余株,造成小麦减产80%以上。2,4—D 丁酯对上述杂草防效很差,甚至无效,致使麦田杂草发生扩展很快,1985年抗性杂草仅零星发生。到1989年已造 The wheat weeds in our city have long been dominated by quinoa and ragweed. The major chemical weediens are 2,4-D butyrate. The long-term use of 2,4-D butyl can significantly enhance weed resistance. 2 The amount of 4-D butyl ester increased from 30 ml per acre in the 1970s to 50 ml or even 75 ml per mu. Some resistant communities have also emerged one after another, such as: Artemisia annua, wheat grass bottle, ion grass, wheat family, wild oats, Polygonum convolvulus. These weeds have strong vitality and reproductive capacity, which are detrimental to wheat. For example, the highest content of wheat straw was more than 1800 per square meter, resulting in more than 70% reduction in yield of wheat and more than 300 strains per square meter of Polygonum viviparum, resulting in more than 80% reduction of wheat yield. 2,4-D butyl ester on the weeds control effect is poor, or even invalid, resulting in the rapid expansion of weeds in the wheat fields, resistant weeds only sporadic 1985. By 1989 has been made