六盘山翠金小蜂生物学特性的研究

六盘山翠金小蜂Tritneptis sp.是华北落叶松人工林主要食叶害虫落叶松红腹叶蜂Pristiphora erichsonii Hartig茧期的体外复寄生性天敌。对该蜂的生物学特性研究表明,该蜂在宁夏六盘山1年2代,以幼虫在寄主茧内越冬,翌年4月中旬开始活动取食,5月中旬开始化蛹,成蜂从6月中旬开始羽化,每头虫茧平均出蜂6.14头,雌雄比1.79∶1,雌蜂6月下旬开始产卵,一只雌蜂一生可在12.2头寄主虫茧上产卵,第1代寄生蜂幼虫7月上旬开始孵化并吸食寄主营养发育,7月下旬开始化蛹,8月上旬开始羽化并交尾、产卵寄生。该蜂体型较大,对寄主跟随性强,无重寄生天敌,自然寄生率7.3%～33.6%,是一种优良天敌寄生蜂。

Biological characteristics of Tritneptis sp.

The Liupanshan Tsui Nasonia （Tritneptis sp.） is a species complex of parasitic wasps that are the main natural enemy of the red belly larch sawfly （Pristiphora erichsonii Hartig）,a major leaf-eating pest in commercial larch forests.These wasps have one generation per year at Liupanshan with mature larvae overwintering in the host cocoon.Pupation takes place in late April of the following year and ends in late June.From the middle of June wasps start ＂feathering＂;the average number of wasps per cocoon was 6.14,and the male to female sex ratio in late January was 1.79：1.7.Oviposition took place from late June to late August with females laying,on average,12.2 eggs on the host cocoon.Wasp larvae begin to hatch in mid-August and mature in late October.The relatively large size of this parasitoid,its close adaptation to its host and its natural parasitism rate of 7.3%-33.6% make it a particularly effective parasitic wasp.