松褐天牛疫木隔离结合人工释放管氏肿腿蜂防治松材线虫病

为提高天敌昆虫寄生松褐天牛以此控制松材线虫病的效果，本研究采用松褐天牛疫木就地隔离，同时加上人工助放管氏肿腿蜂的方法，开展了控制松材线虫病的试验。结果表明：管氏肿腿蜂对松褐天牛低龄幼虫的致死率最高达68．50％，对中老龄幼虫的致死率为44．58％。3月和4月释放，松褐天牛死亡率分别为57．11％和65．64％，而5月份释放幼虫死亡率只有14．57％。将疫木劈为4开的情况下时，天牛死亡率最高，达71．33％。单边放蜂，松褐天牛的死亡率最高达67．18％。铁丝网、渔网和聚丙烯布隔离疫木对松材线虫病的发生都有较好的控制效果，其中铁丝网隔离后，健康松树死亡率下降到2．5％，渔网和聚丙烯布隔离后，松树死亡率为12％，均显著低于对照的80％。表明隔离松疫木加上施放管氏肿腿蜂能有效控制松材线虫病流行危害。

A Field Test of Controlling the Pine Wilt Disease with the Technique of Isolating Monochamus alternatus on Forest Spot and Releasing Parasitoid

In order to improve the control effect of pine wilt disease caused by nematode Bursaphelenchus xylophilus （Steiner ＆ Buhrer） Nickle, we have made a field test with the technique of releasing wasp Sclerodermus guani Xiao et Wu to parasitize the larvae Monochamus alternatus Hope and isolating the longhorn beetle M. alternatus in pine trunk with isolator. The results showed that the pest mortality was 68.50% when the larvae live under the pine bark; and the pest mortality was 44.58% when the larvae live in the woody pupa chamber after releasing the parasitoid. When releasing the parasitoid in March and April, the pest mortality was 57.11% and 65.64% respectively, but only 14.57% when releasing in May. When the pine trunks were split to four pieces, the pest mortality was 71,33%. And the pest mortality was 67.18% when releasing the parasitoid in one side of the trunk. When isolating the pine trunk with wire netting, nylon fishing net or polypropylene net, the pine mortality were reduced to 2.5%, 12% or 12.5% respectively, and the CK was 80%. These findings suggested that controlling the pine wilt disease caused by B. xylophilus by technique of isolating M. alternatus on forest spot with nets and releasing parasitoid against the longhorn beetle larvae is effective.