【摘要】 2002年9月丰县稻田普遍发生棉铃虫,全县稻田平均有幼虫5.2头/m2。经分析,夏、秋季持续高温干旱和晚熟粳稻品种的大面积推广是发生的主要原因;稻田与主要虫源地的距离、水稻品种、虫源地寄主作物的种类是影响虫口密度的主要因子。更多还原

【Abstract】 Helicoverpa aramigera widespread occurred in rice fields in Feng county, the population densities of Helicoverpa aramigera larva reached to 5.2/square meters. Analysis on its incidence revealed that high temperature with drought and widespread cultivation of late japonica rice was main reasons. The distance between rice fields and major pest propagation locations, rice varieties and the types of crops on which pest propagated were main factors in determining the densities of Helicoverpa aramigera larva.更多还原