喜树黄毒蛾生物学特性及其防治初步研究

Preliminary Study on the Bionomics of Euprocitis sp.and Its Control

喜树黄毒蛾是喜树的一种重要害虫。该虫在福建沙县一年发生6代,以3～4龄幼虫在落叶或地被物上结薄茧越冬。翌年3月上旬开始活动取食,3月中旬开始化蛹,4月上旬始见成虫。每雌蛾产卵174～409粒,卵期4～9天。幼虫5龄,少数6龄或7龄。越冬代幼虫历期87～108天,其余各代15～34天。老熟幼虫结茧前停食2～3天,在喜树枝杈或叶背结茧化蛹,蛹期6～20天。试验表明,喷洒20％敌敌畏或90％敌百虫晶体2000倍液,有良好防治效果。

The lymantriid moth Euproctis sp.is a serious pest of Campthotheca acuminata Decna. It has six generations per year in Shaxian ,Fujian Province. The 3-4th instar larvae spend the winter inside thin cocoons made on fallen leaves of in clumps of weeds.The overwintering larvae begin to feed on the leaves in early March and pupate in mid-March next year.The adult moths begin to appear in early April. Each female deposits 174-409 eggs.The egg stage lasts 4 to 9 days.Five instars ars oberved in the larval development, but a few of them have six or seven instar,The overwintering larval stage lasts 87 to 108 days and the others last 15 to 34 days.Mature larvae stop feeding two or three days before spinning cocoons,and pupate on the underside of the leaf, branches and trunks.The pupal stage lasts 6 to 20 days.Our experiments have shown that the following control measures are effective:1)Spraying 89%DDPV or 90% Dipterex emulsion in a concentration of 1:2000; 2)Dusting Beauveria bassiana powder.