黄杨绢野螟生物学特性及其防治

黄杨绢野螟在浙江丽水1a发生1～5代，以各代3～4龄幼虫缀叶结薄茧在枝条上越冬，翌年3月下旬出蛰活动，5～9月为害严重。3月下旬至4月上旬是防治的关键时期，用25％灭幼脲Ⅲ号悬胶剂或1．8％阿维菌素乳油1000倍液喷雾防治，效果10d后均可达90％以上；卵期、幼龄幼虫期修剪是防治黄杨绢野螟的有效办法，但修剪次数不宜过多；园林上合理使用农药，保护天敌昆虫，对有效控制黄杨绢野螟的的为害、减少环境污染具有重要意义。

Bionomics and Control of Diaphania perspectalis

Diaphania perspectalis has 1-5 generations annually in Lishui,Zhejiang province,overwinted by 3-4 instars larva of the each generation at shoot.It takes activities by the end of March and damages seriously from May to September.Spraying 25% chlorbenzuron III or 1.8% 1 000-fold of abamectin from the end of March to early April,the critical period of control,could decrease the damage of the later generations.Pruning was an effective measure during egg or larva period.But too much pruning will sprout too many young leaves for larva,so that endanger more seriously Buxus sinica.There are many species of natural enemy of D.perspectalis,especially in October.It is important for protecting natural enemies and reasonable using insecticide to control of D.perspectalis.