1　杂草发生特点河南省是我国夏芝麻的主要产区 ,由于田间杂草种类繁多 (优势杂草有马唐、牛筋草、稗、千金子、狗尾草、画眉草、莎草、野苋、青葙、鳢肠、铁苋菜、马齿苋等 ) ,加之芝麻种子粒小 ,幼苗期生长缓慢 ,6月上、中旬播种时 ,正值高温多雨季节 ,杂草萌发出土快 ,生长 1 Weeds Occurrence Henan Province is the main producing area of ​​summer sesame in our country. Due to the wide variety of weeds in the field (the dominant weeds are crabgrass, goosegrass, barnyardgrass, cadmium, foxtail, thrush, sedge, amaranth, Barley, amaranth, purslane, etc.), combined with small seeds of sesame seeds, slow growth of seedlings in June on the mid-sowing, positive hot and rainy season, weeds germination unearthed, growth