据河北省农业专家对该省小麦主产区调查,禾本科杂草已侵入全省280万亩麦田,成为确保小麦高产的最大隐患。该省麦田出现的禾本科杂草包括雀麦、节节麦、野燕麦、田旋花等,属于麦田恶性杂草,具有繁殖系数高、有效防治时间短、早熟、脱落 According to a survey conducted by agricultural experts from Hebei Province on the major wheat producing areas in the province, grass weeds have intruded into the 2.8 million mu of wheat fields in the province and become the biggest hidden danger for ensuring high yield of wheat. Gramineous weeds appeared in the province’s wheat fields include brome, nocturnal, oat, vase, etc. belong to wheat field weeds, with high reproductive efficiency, effective control time is short, precocious, fall off