敌敌畏烟剂防治落叶松球蚜试验

落叶松球蚜危害严重,在小陇山林区有蔓延和扩大之势。采用2%敌敌畏烟剂在3个日本落叶松人工林小班进行喷烟防治试验。结果表明,2%敌敌畏烟剂防治效果良好,防治率接近或超过80%;林分郁闭有利于发挥烟剂防治作用,郁闭度>0.7时效果最好。研究还发现,落叶松球蚜自然死亡过程中具有一定的群集效应,2%敌敌畏烟剂防治中残存活虫具有一定在梢顶集中的现象。

Experiment of Dichlorvos Smoke Agent on Control of Adetgs laricis

Adelge laricis are severely harmful, and they are likely to spread and expand in Xiaolongshan forest area. Smoke control tests were carried out with 2% Dichlorvos smoke agent in 3 Larix kaempferi plantations. The results showed that the control effect of 2% Dichlorvos was good, and the control rate was close to or more than 80%. Stand canopy closure is beneficial to the prevention and treatment of smoke agent, and the effect was best when the canopy density more than 0.7. The study also found that the natural death process of Adelge laric is had a certain clustering effect, and the residual surviving insects in the control of 2% Dichlorvos had a certain concentration at the tip.