新疆北部棉区第二代棉铃虫危害损失与防治指标研究

A Research on the Economic Damage and Control Threshold of Second Generation Cotton Bollworm in Northern Xinjiang

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 。

By artificially modifiing steps of the density of cotton bollworm Helicorerp a armigera, the damage to the cotton plant and control threshold to the second generation in the cotton fields of northern Xinjiang was researched.A correlation formula between yield loss rate (Y) and larval density (larval per 100 plants)(X) was formed:Y=1.9312+0.0911X. In view ofeconomy and ecology view the control thresholds were made under different rate of pest to natural enemy for second generation of cotton bollworm in Northern Xinjiang cotton growing areas.