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草(Beckmannia S1/2igachne)俗称扁稗、水稗、麦田野稗,过去零星分布于沟沿边、田埂旁及阴湿处。由于该草繁殖力极强,传播很快,麦田从1985年开始发生,在短短一二年内就迅速蔓延为害。据在丰食溪乡山头村设不防治区进行观察,1986年起草逐步取代了看麦娘,成为麦田恶性杂草(表1)。发生面积也不断扩大,据1987年全县247块田调查,频度为23.08％;1991年682块田调查,频度达到84.13％。全县发生面积达到7.8万亩,其中严重发生面积达
Commonly known as the barnyardgrass (Beckmannia S1 / 2igachne), barnyardgrass, barnyardgrass, barnyardgrass, the past sporadic distribution along the edge of the ditch, field ridge and the Department of dampness. Because of its extremely fertile nature and its rapid spread, the wheat fields started in 1985 and spread rapidly in just 12 years. According to Fengsiyixi Township Village set up non-control area for observation, since 1986 gradually replace the Achnatherum nourishment to see the mother, a vicious wheat weeds (Table 1). Occurred in the area has also been expanding, according to the 1987 247 counties in the county survey, the frequency was 23.08%; 1991 682 plots of fields surveyed, the frequency reached 84.13%. The county occurred an area of 7.8 hectares, of which a serious area of up to