沛县冬小麦常年种植面积超过4万hm2。麦田杂草优势种群是禾本科的硬草,占杂草总数的70%～80%,因其耐药性强,防除难度大,已成为本县麦田发生量最大的恶性杂草。1麦田硬草发生为害特点调查表明,本市麦田杂草以禾本科为主,主要有硬草、野燕麦、看麦娘、蜡烛草等,占全部杂草70%～90 Peixian winter wheat annual planted area of ​​more than 40,000 hm2. The dominant species of weed in wheat field are grasses, accounting for 70% ~ 80% of the total number of weeds. Due to their strong resistance and difficulty of controlling, weeds have become the most serious weeds in wheat field in this county. 1 Harvesting characteristics of hard wheat grass field Survey showed that the city of wheat weeds dominated by grasses, mainly hard grass, wild oats, Amaryllis, candle grass, etc., accounting for 70% of all weeds 90