汉源县不种棉花,历史上棉铃虫仅在少量辣椒、蕃茄上进行危害。1984年4—5月在海拔1,100—1,600米的小麦产区,突发性危害小麦麦穗,尤以宜东区富庄乡为重,全乡700余亩麦田受害,其中河东村110亩河坝田受害最重。一般田块每平方米有幼虫43—45头,虫口密度每亩28,666—30,000头;严重田块每平方米有幼虫78头,亩虫口密度52,000头。受害田块像撒了一 Hanyuan County, not cotton, cotton bollworm history only a small amount of peppers, tomatoes on the hazard. From April to May 1984, at the wheat growing area 1,100-1,600 meters above sea level, the wheat ears were unexpectedly harmed, especially in Fuzhuang Township, Yidong District. More than 700 acres of wheat fields were harmed in the township, of which 110 mu Tian suffered the most. In general, there are 43-45 larvae per square meter in the plots and 28,666-30,000 per acre in density. In the serious plots, there are 78 larvae per square meter and the densities of muskets are 52,000. Victim plots like a sprinkle