论文部分内容阅读
采用人为调整虫量梯度的方法 ,研究了新疆北部棉区二代棉铃虫在自然状况下对棉花的危害和防治指标。结果表明 :产量损失率 (Y)与百株虫量 (X)的关系为Y =1.9312 +0 .0 911X ,从经济学和生态学角度上 ,提出并制定了不同益害比下新疆北部棉区二代棉铃虫的防治指标
This paper studied the harm and control of the second generation cotton bollworm (Helicoverpa armigera) in the northern part of Xinjiang to the cotton under the natural conditions by artificial adjustment of the worm mass gradient. The results showed that the yield loss rate (Y) was related to the number of insects per hundred (X) Y = 1.9312 +0 .0 911X. From the perspective of economics and ecology, Control index of second generation cotton bollworm in the district