随着2,4—D类除草剂在麦田的施用,麦田中双子叶杂草不断减少,而单子叶杂草(如狗尾草、燕麦等)有不同程度的增加,严重地影响了小麦产量的提高。近几年,我团受狗尾草为害的麦田面积占小麦种植面积的15.5％～32.1％,受害麦田一般减产7％～23％。为此,我们对焉耆垦区内狗尾草的生长发育特点进行了较系统的观察,并进行了防治试验,现将结果报道如下: With the application of 2,4-D herbicides in the field, the number of dicotyledonous weeds in the field decreased continuously, while that of monocotyledonous weeds (such as Setaria viridis and Oats) increased to some extent, which seriously affected the yield increase of wheat . In recent years, the area of ​​wheat fields affected by Setaria viridis accounts for 15.5% -32.1% of the area planted with wheat, and the yield of the affected wheat fields has generally decreased by 7% -23%. For this reason, we conducted a systematic observation on the growth and development characteristics of Setaria viridis in Yanzha Reclamation Area and carried out the prevention and treatment test. The results are reported as follows: