【摘要】 通过室内测定甜菜夜蛾对空心菜、上海青、菠菜的取食量 ,进行田间模拟剪叶 ,确定虫量与产量损失率的关系 ,并根据当地生产水平、产品价格、防治成本及药剂防治效果等 ,分别制定了我省常规产量下空心菜、上海青及菠菜的防治指标 [分别为 12 60 0 0、65 5 0 0 0和 2 640 0 0头· hm-2 (3龄幼虫 ) ].此外 ,还提供了在不同产量、不同经济系数下的防治指标 ,以指导生产上防治更多还原

【Abstract】 By the determination of the feeding amount of Spodoptera exigua on water couvovulus, spinach, Chinese cabbage, the imitative test through leaf cutting in the field was carried out. The relationship between the number of larvae and the damage rate of yield was analyzed . According to production level, product price, controlling cost and insecticidal effect, the economic thresholds of water couvovulus, spinach and Chinese cabbage were determined as 126000, 655000 and 264000 larvae·hm -2 respectively in the third instar under the ordinary yields of Fujian Province. In addition, some other economic thresholds under different yields and different economic coefficients were also provided for references of the pest control.更多还原