棉铃虫为害红三叶初探

A PRELIMINARY STUDY ON THE DAMAGE OF HELITHIS ARMIGERA TO TRIFOLIUM PRATENSE

贵州省独山草籽场1986～1987年70余公顷红三叶首次发现棉铃虫为害,并造成毁灭性损失。暴发条件为气候适宜、红三叶生长嫩绿,花早、花多、花期长,给该虫提供了充足的补充蜜源和丰富的食料。防治上应以有计划地放牧和刈割为主,改变生态环境,可以避开和减轻为害。

From 1986 to 1987, we first discovered that about 70 hectares of Trifolium pratenes pasture had been damaged and seed production had suffered heavy lesses by Helithis armigera in Dushan seed farm of Guizhou. Early flowering, much flowers and long period of flower can provide the sufficient supplementary nectar source and plertiful food for Helithis armigera reasonable grazing and cutting can change the ecological enviroment and avoid or reduce damaging.