美洲斑潜蝇对四季豆的危害损失及防治指标研究

Bean yield loss caused by Liriomyza sativae and controld threshold.

采取自然感虫与药剂控制虫量相结合的方法 ,人为造成 6个不同虫情梯度 ,分析虫情指数与产量损失率之间的关系。结果表明 ,虫情指数与产量损失率之间成正相关 ,回归方程为Y =1 0 0 8+0 7661X 。

The relationship between insect density and bean yield loss caused by Liriomyza sativa was analysed under the natural and artificial conditions.The results showed that the pest population density and bean yield loss were positively correlated and the regressive model was Y=1 008+0 7661X .The chemical control thresholds under the different yield levels were assessed based upon the economic threshold.