木毒蛾质型多角体病毒的研究

<正>木毒蛾(Lymantria xylina Swinhoe)是木麻黄的重要害虫。该虫分布广,蔓延快,食量大,严重危害着我省沿海10多万亩木麻黄防护林。为了多渠道开辟木毒蛾生物防治的途径,我们于1983年5月在福建省平潭县木麻黄林内对各种类型的自然感病死亡的木毒蛾幼虫进行调查,新发现一种质型多角体病毒。通过人工感染试验,证实木毒蛾质型多角体病毒具有较强的感病力。木毒蛾质型多角体病毒(cpv)是国际上首次发现,现将观察试验结果报告如下。

STUDIES ON THE CYTOPLASMIC POLYHEDROSIS OF LYMANTRIA XYLINA SWINHOE

This paper deals with the results of the studies on the Cytoplasmic polyhedrosis of Lymantria xylina.The Cytoplasmic polyhedrosis of Lymantria xylina swinhoe is of limited epizootic in nature. The body of dead larvae is shrunk in size, its seta stands up, its colour remains unchanged and its skin is tough. The body of dead larvae contains a large amount of Cytoplasmic polyhedrosis.Electron microscopic investigation showed that the polyhedra are hexagonal or spherical in shape, and their average diameter is 2 . 3 rnm. Diameters of the virus particles vary from 55 mμ to 65 mμ Obviously, on the top of the virous particles, there are six protrusions in the shape of thorn. Bioassary conducted in the laboratory showed that mortality of the treated larvae depends on the concentration of the virous suspension. The mortality of the fifth to seventh instar larvae turned out to be 81.5%, 76.2% and 60.2% respectively when treated with the concentration of 3.2×108 polyhedra/ml, 3.2×107 polyhedra/ml, and 3.2×106. iPolyhedra/ml.Cross infection experiment showed that the Cytoplasmic polyhedrosis of Lymantria xylina swinhoe has no infectivity to Bombyx mori and Dendrolimus punctatus, and its specialization is obvious.