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利用棚室番茄和豇豆田间自然感虫或人工控制虫量的方法,采取在不同虫情指数梯度下对产量的测定,得出产量损失规律。结果表明,斑潜蝇对番茄的为害随着虫情指数的增大番茄的单株产量下降(y1=1168.69-6.7958x1),产量损失率增高(y2=0.5845x2-0.527);防治指标为当虫情指数达到2.18时,就应及时用药防治。斑潜蝇对豇豆的为害,随着虫情指数的增大,豇豆的单株产量下降(y3=413.99-2.41x3),产量损失率增高(y4=0.5843x4-0.3613);防治指标为当虫情指数达到2.76时,就应及时用药防治,为较好的控制全年的为害打下基础。
Using the natural insects or artificially controlled insects in the greenhouse of tomato and cowpea in greenhouse, the yield was determined under different grazing index gradients and the law of yield loss was obtained. The results showed that the damage of tomato on leafmold was decreased with the insect index increasing (y1 = 1168.69-6.7958x1) and yield loss (y2 = 0.5845x2-0.527). The control index was Insect index reached 2.18, it should be timely drug control. With the insect index increasing, the yield per plant of cowpea decreased (y3 = 413.99-2.41x3) and the yield loss increased (y4 = 0.5843x4-0.3613) Love index reached 2.76, it should be timely drug control, to better control the damage throughout the year to lay the foundation.