近年来,随着小麦生产水平的不断提高及长期使用单一除草剂,三原县麦田杂草群落发生较大变化,尤其是恶性杂草麦家公、猪殃殃、婆婆纳、野燕麦、节节麦等发生范围逐渐扩大,危害程度日趋严重。在小麦生产中,多数群众习惯在春季使用化学除草剂除草。其实冬前比冬后进行化学除草的效 In recent years, with the continuous improvement of wheat production level and the long-term use of a single herbicide, the weeds community in Sanyuan County has undergone major changes, especially the weeds Malian, Galium aparine, Wheat and other areas of the gradual expansion of the extent of the damage is becoming more serious. In wheat production, most people are accustomed to using chemical herbicides for weeding in the spring. In fact, winter before the chemical weed control effect