扁豆小灰蝶的生物学特性及其防治研究

Biological Characteristics of Lampides boeticus L. and Its Control.

扁豆小灰蝶在湖南洪江全年可发生８～９代，主要以蛹和部分幼虫在扁豆残株等处越冬。一～四代幼虫在４～７月先后为害豌豆，长江豆，豇豆和扁豆，四代后８～１１月集中为害扁豆。该虫完成一代需３０～５０ｄ，卵期５～８ｄ，幼虫期１５～２５ｄ，前蛹和蛹期８～１１ｄ，成虫寿命２～５ｄ。卵主要产在花萼和花蕾上，少数产在幼荚处。幼虫蛀食花蕾和豆夹，并能转蕾和转夹蛀害。老熟幼虫在地面杂草，落叶或土缝中化蛹。在卵盛孵期喷施８０％敌敌畏８００倍液，２．５％敌杀死１５００倍液和２５％杀虫双２００倍液，防治效果分别为８５．７％～８７．８％、８７，２％～８８．８％和８０％～８１．３％。

This paper reported the results of an investigation on the biological characteristics and cheni-cal control of Lampides boeticus L. in Hongjiang Area from 1 991 to 1 992. The pest occurs 8-9 genera-tions each year and overwinters in the stubble of hyacinth dollchos plants and other places in pupae stage and a few in larvae stage. The larvae of 1-4 generations damaged mainly on the vegetable bean, aspara-gus bean, hyacinth dolichos from April to July , the other generations damaged only on hyacinth dolichos from Agust to November each year.The duration of one generation is 30-50 days. The egg stage is 5-8 days and larval stage is 1 5-25 days. Prepupal and pupal stage is 8-11 days and adult stage is 2-5 days.Their eggs are laid mainly on the calyces and flower buds of Leguminous vegetables but a few in the young bean pods. The larvae bored into the flower buds and bean pods. The mature larvae pupated in the weeds and fallen leaves on the ground or in the soil crack. DDVP 80%EC(1× 800), deltamethrin 2.5% EC(1× 1500)and Shachongshuang 25%L(1×200) can be used as spraying agent in hatch peiod of its eggs and the efficacies were 85.7%-87.8%, 87.2%-88.8%and 80%-81.3%, respectlvely.