棉铃虫多胚跳小蜂生物学特性研究

Studies on bionomics of Litomastia heliothis Liao

棉铃虫多胚跳小蜂是棉铃虫的一种寄生性天敌。该蜂一年1代，以幼虫在土内越复越冬（在棉铃虫幼虫体内），当5月份棉铃虫在麦田产卵时，该峰也同时羽化，并在棉铃虫卵内产卵寄生，当棉铃虫幼虫老熟入土后，该蜂突然行多胚生殖，一个棉铃虫幼虫体内有峰高达800～900头，棉铃虫则很快死亡。本文对该蜂的昼夜活动，田间消长、交配和产卵行为等都作了报道。

Litomasti heliothis Liao is one of the parasites of cotton bollworm (Heliothis armigera (Hbner). It occurs one generation a year. The larvae of Litomastia heliothis Liao oversummer and overwinter under the soil surface. In May, when the moth of cotton bollworm dcposites eggs on the ears of wheat. the wasps synchronize emergence and deposites eggs in the host's eggs. When the Mature larvae of cotton bollworm were going to pupat., the wasps enter on polyembryonic reproduction immediatly, so there are about 800-900 larvae in the host's body. The mating and oviopositing behavior were also observed.