麦田恶性杂草草、硬草自1989年在本县发生以来，传播势头迅猛。全县4.3万hm2小麦已有1．3万hm2受其危害，发生田块减产幅度一般在10％－30％，重者50％以上。但目前对其防除仅局限于药剂防治，且很多农户由于施药品种、技术未掌握而防效差或造成了不同程度的药害。通过近几年的 Malting grass weeds, hard grass has occurred in the county since 1989, the rapid spread of momentum. The county has 43,000 hm2 of wheat has been affected by the harm of 13,000 hm2, the reduction occurred in field plots generally 10% -30%, weight more than 50%. At present, however, its control is only limited to the prevention and treatment of pesticides, and many farmers have poor control effects or have different degrees of phytotoxicity due to the unpicked technologies and technologies. Through the recent years