黄杨绢野螟的生物学研究

黄杨绢野螟（Diaphania perspectalis(Walker)是园林中多种黄杨Buxus spp．的食叶害虫，暴发时可吃光叶片，甚至造成大量植株死亡。此虫体色有黑白和全黑二型。一年发生4代(局部个体一年发生1～3代)，以幼虫缀合叶片成果越冬，次年春暖后恢复取食，4月下旬越冬代成虫开始出现。第1、2、3代成虫分别于6月上旬、7月下旬、9月上旬开始出现。幼虫6～8龄，有兼性滞育现象，1～3代均有部分个体滞育。与4代幼虫一起越冬。此虫各虫态有多种天敌：幼虫期育出甲腹茧蜂Chelonus sp．、绢野螟长绒茧蜂Dolichogenidea stantoni(Ashmead)，蛹期育出广大腿小蜂Brachymeria lasus(Walker)，并采到捕食卵粒的纹蓟马Aeolothrips sp．和多种捕食幼虫和成虫的游猎性蜘蛛(种属待查)。保护天敌对控制黄杨绢野螟的为害有重要意义。

Bionomics of the box-tree pyralis, Diapania perspectalis

Diaphania perspectalis (Walker) is a tree garden insect pest injurious to leaves on many species of Box (Buxus spp.). It can cause complete defoliation when reproducing on a large scale, even destroy the host a great quantity. It has two types of body colour: white-black and holo-black. It has 4 generations during a year (a part of them has 1~3 generations during a year), and hibernates as larva in the hibernaculum with leaves, and resume eating in warm spring the next year respectively. The adults of the first, second, third and hibernated generations emerge in mid-June, late July, early September the first year and late April the next year respectively. The larva has 6~8 instars. The larva of the first, second and third generations has diapause on part of them, it overwinters with the fourth generation. Many natural enemies of the pest were reared, Chelonus sp., Dolichogenidea stantoni (Ashmead) rears from larva;Brachymeria lasus (Walker) rears from pupae. One species of egg predator was collected, namely Aeolothrips sp., and many species of predatory spiders are collected, which prey on larvae and adults. Protecting the natural enemies of Diaphania perspectalis (Walker) is a significance method for the pest control.