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南美斑潜蝇 [Liriomyzahuidobrensis(Blanchard) ,Lh]是冬春洋葱上的主要害虫之一。为将Lh控制在经济危害水平 (EIL)之下 ,采用 1% 70 5 1杀虫素 2 0 0 0倍液 ,在洋葱上Lh初发阶段 ,施药 1,3 ,5次 ,人为造成洋葱上Lh的虫害梯度。应用试验结果 ,建立Lh幼虫量与产量损失的回归方程 :Y =10 3 0 398- 0 415 6x ,r =- 0 970 6 ,Lh幼虫虫口量与产量呈负相关。根据单叶虫量与单株产量相关性的数学模型 :Y =0 40 0 9- 0 0 80 9x ,进行防治指标研究 ,当 y =0时 ,x =4 95 5 5 ,即平均每叶有幼虫 5头时应进行防治
Liriomyza huidobrensis (Blanchard), Lh, is one of the major pests on winter and spring onions. In order to control the Lh under the level of economic hazard (EIL), 1% 70 5 1 insecticide was used in 200 times, and on the onion Lh initial stage, the pesticides were applied for 1, 3 or 5 times to make the onion Lh on the pest gradient. Applying the test results, the regression equation of Lh larvae amount and yield loss was established: Y = 10300398-0 4156x, r = - 0 9706, and there was a negative correlation between Lh larvae population and yield. According to the mathematical model of the correlation between single-leaf insect and single-crop yield: Y = 0 40 0 9- 0 0 80 9x, the control index research, when y = 0, x = 4 95 5 5, 5 larvae should be controlled