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菜青虫、小英蛾、斜纹夜蛾、甜菜夜蛾、银纹夜蛾是长江中下游地区甘蓝菜５种主要食叶害虫。通过人工模拟剪叶试验，建立了甘蓝菜叶面积损失与产量损失的功能函数式。结果表明，甘蓝菜不同生育阶段叶面积损失与产量损失明显地呈正相关。５种食叶害虫的取食量分别进行了测定。根据每个种的潜在为害，计算了每种幼虫不同发育阶段的校正当量系数，建立了为害当量系统，并制定了甘蓝菜主要食叶害虫的复合防治指标。田间实际应用结果表明，为害当量系统对于虫龄不一的几种害虫同时为害制定防治决策是很实用的。
Pieris rapae, Xiaoying moth, Spodoptera litura, beet armyworm and Spodoptera litura are the five main leaf-eating pests of cabbage in the middle and lower reaches of the Yangtze River. By artificial simulated leaf cutting test, the function formula of leaf area loss and yield loss of cabbage was established. The results showed that leaf area loss and yield loss in cabbage at different growth stages were positively correlated. Five kinds of leaf-feeding pests were measured food intake. According to the potential damage of each species, the calibration equivalence coefficient of each stage of larvae was calculated, and the equivalent system of damage was established. The composite control index of main leaf-eating pests was established. Field practical application results show that the equivalent system of pest control for the pest of different age at the same time to develop pest control decision-making is very practical.