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1994年以来,靖远松叶蜂(Diprionjingyuanensis)在关帝山林局的油松林内猖獗为害,以幼虫取食油松2年生以上(含2年生)针叶,该虫一年1代,以茧内预蛹越冬。7月上中旬为卵孵化盛期。幼虫蜕皮4次~5次。10月下旬老熟幼虫下树,在树冠投影范围内的地被物下结茧越冬。该虫的发生及危害,阴坡大于阳坡,纯林大于混交林。在山高林密、交通不便、害虫发生面积大而集中连片,且蔓延速度快的情况下,宜采用飞机喷药防治法。飞防时间在关帝山为8月中旬。每一架次用氰戍菊酯60kg、食用精盐50kg、水690kg,可完成飞防面积120hm2。白虎岭、三道川、双家寨三个林场飞防面积共2.32万hm2,防治效果均达87%以上。
Since 1994, Diprionjingyuanensis has been rampant in the Pinus tabulaeformis forest in Guandi Forest Bureau. The larvae feed on needles of Pinus tabulaeformis for more than two years (including 2 year olds) Pre-pupal wintering. Mid July is the peak of egg hatching. Larvae molting 4 times to 5 times. In late October mature larvae under the tree, in the canopy projection within the ground by the cocoon under winter. The occurrence and damage of the insects, shady slope greater than the sun, pure forest greater than mixed forest. In the high mountains and dense forests, traffic inconvenience, large areas of pests and concentrated contiguous, and the spread of fast cases, should adopt the aircraft spraying prevention and control law. Flying time in Guanshan for mid-August. Each shelf Cypermethrin 60kg, edible salt 50kg, water 690kg, can be completed fly-proof area 120hm2. White Tiger Ridge, Sandaichuan, Shuangjiazhai three forest fly-prevention area of a total of 32200 hm2, prevention and control effects are up to 87%.