【摘要】 本文报道了寄生于烟色大蠊Periplaneta fuliginosa(Serville)卵荚内的两种啮小蜂:Tetrastichus hagenowii和Tetrastichodes sp.,并讨论了Tetrastichus hagenowii的生物学特性。所收集的(虫非)蠊卵荚中,该蜂的自然寄生率为50.38％。观察14枚卵荚的出蜂数,最多为202只/枚,最少为10只/枚,平均为74.92只/枚。雌雄性比为1:0.42。该蜂4月上旬开始出现,5—8月是繁殖高蜂期,11月上旬则少见。接蜂的8枚卵荚孵出的成蜂平均存活12.8天(14.4天.10.2天)。蜂在卵荚内的发育时间与温度有关,在夏季比在秋冬季显著为短。成蜂的产卵期较长:而且除产卵于新鲜(虫非)卵荚内,也产卵于已产出7天以上的卵荚内。本文的观察结果为人工繁殖该啮小蜂用以防治室内(虫非)蠊提供了科学依据。更多还原

【Abstract】 Adults of Tetrastichus hagenowii and Tetrastichodes sp. emerged from the oothe-cae of Periplaneta fuliginosa collected from four places in Zunyi and the parasitism rates of the ’former species were 71.9%, 93.1%. 6.6% and O respectively. The sex ratio of the wasps emerged from fourteen oothecae was 1:0.4 in favous of the female. The maximum mumber of wasps emerged from a single ootheca was 202. Mating took place almost immediately after emergence of the wasps from the oothecae and egg laying soon fallwo-ed. They were very active during the first 2 to 3 days.The wasps began to emerge in early April and the peak of population growth was from May to August. The life span of the females was from 3 to 47 days and that of the males from 2 to 40 days. Development of the immature stages ranged from 29 to 62 days in May and June, but might last ’for months in the winter. The oviposition period was rather long.Based on our results, we consider this species has potential value in biological control of the cockroach.更多还原