板栗红蜘蛛的危害及其防治

Injury of Oligonychus ununguis (Jacobi)to Chinese chestnut and its control

板栗红蜘蛛主要危害板栗叶片 ,常造成板栗严重减产。用 2 0 %三氯杀螨醇 ,或 40 %毒死蜱 ,或 40 %氧化乐果乳油防治 ,施药 3d后防治效果均达 90 %以上 ,施药 6d后 ,40 %氧化乐果乳油的防治效果达 10 0 %。

Oligonychus ununguis (Jacobi) is mainly harmful to the leaves of Chinese chestnut. It can easily cause a serious reduction of chestnut output. If several pesticides are sprayed at different concentrations, the damage can be lowered to a preat extent.