甘蓝害虫优化管理中蚜虫类行动阈值研究

通过对秋甘蓝“京丰一号”逐株记载蚜量、植株长势及经济产量系统调查,明确秋甘蓝移栽后的幼苗期不能遭受蚜害;生长良好的一类苗,莲座期可耐蚜量主峰日3000头/株以下;但结球始期蚜量与产量有显著关系,不应受蚜害。

Study on the action threshold in cabbage pest optimal management of the aphides

Aphid density, growing power of the plant and economic yield of the crop were recorded by systematic investigation on the Autume cabbage “Jingfen-1”. The results showed that the cabbage plants grown well were able to tolerate the injury of less than 3 000 aphides per plant, especially 1 500 aphides per plant at the precupping stage. However, at the cupping stage, there was significant relationship between the aphid density and the yield of the common cabbage; therefore, the cabbage plants must be free from the infastation by aphid in that time.