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在 Ｄｐｔ Ｃ Ｐ Ｖ 防治后的德昌松毛虫林区内，通过林间调查及室内镜检连续观测松毛虫的带毒率及感病死亡率。结果 Ｄｐｔ Ｃ Ｐ Ｖ 的持续效果明显， Ｄｐｔ Ｃ Ｐ Ｖ 能通过带毒成虫产卵传给子代，并引起幼虫大量感病死亡，蛹重、羽化率、产卵量明显下降；与化防区相比天敌昆虫明显增加，能控制松毛虫 ５ 年以上有虫不成灾，郁闭度大的林分已长达 １２ 年；郁闭度是影响 Ｄｐｔ Ｃ Ｐ Ｖ 持续效果的主要因素，郁闭度越大，松毛虫带毒率和感病死亡率也愈高，持续时间也越长。
In the forest zone of Dendrolimus punctatus after Dpt C P control, the incidence and susceptible mortality of the pine caterpillars were continuously observed by forest investigation and indoor microscopy. Results The sustained effect of Dpt C P V was obvious. Dpt C P V could be transmitted to the offspring via spawning of adult worms and caused a large number of susceptible deaths. The pupal weight, emergence rate and the number of spawning decreased significantly. Compared with the natural enemies of insects increased significantly, can control the pine caterpillars for more than 5 years without worms, canopy density forest has been up to 12 years; canopy density is the main factor affecting the sustained effect of Dpt C P V, canopy density The larger, the pine caterpillar infestation rate and the mortality rate is also higher, the longer the duration.