摘要
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 L,.Plutella xylostella L.,Spodoptera liture Fab,Spodoptera exigua(Hubner)and Plusia agnala Standinger are main leaf-mass consuming insect pests on cabbage in middle and lowerreaches of the Yangtze River.Functional equations reflecting the relationships between the losses of leaf-areaand losses of cabbage yield were established by artificially cutting off cabbage leaf for simulating the damage ofthe pests. The results showed that there was a significant positive correlation between the cut-off leaf areasand cabbage yield losses at different growth stages of cabbage. The amount of leaf areas consumed by fivespecies pests was determined individually.The adjusted injury equivalency coefficients of larvae of differentspecies were calculated based on potential injury of each species。 Thus,the injury equivalency system was es-tablished.The multlple-species economic thresholds were proposed for leaf-mass consuming insect pests ofcabbage. The results of multiple -species economic threshold applied to field data indicated that the injury e-quivalency system was very useful to make a control decision for mixed damage of several insect pests in con-fused instars.
出处
《江苏农学院学报》
CSCD
1994年第3期23-28,共6页
Jiangsu Agricultural Research
基金
江苏省科委"八五"应用基础
关键词
食叶害虫
甘蓝
防治
危害
leaf-eating insects
cabbage
equivalen+system/multiple-species economic threshold
