近年来，野高粱在石家庄郊区的危害巳遍及春夏玉米、棉花、瓜类等多种作物，其中尤以夏玉米受害最为严重。由于其能与玉米苗同期生长，而且生长速度快．发生密度大，与玉米苗争水、争肥、争气、争热，以致导致王米幼苗茎细、叶黄、植株矮小，严重影响玉米的正常生长发育。但由 In recent years, the damage of wild sorghum in the suburbs of Shijiazhuang has covered many crops such as spring and summer corn, cotton, melon and so on, especially the summer maize is the most serious one. Because of its growth with maize seedlings over the same period, but also grow faster. Occurred density, and corn seedling water, fight fat, fight for gas, heat, resulting in Wangmie seedling stem thin, yellow leaves, short plants, seriously affecting the normal growth and development of corn. But by