茄子品种对茄二十八星瓢虫及其寄生蜂生长发育的影响

Effects of eggplant varieties on the growth and development of Henosepilachna vigintioctopunctata and its parasitoid.

茄子不同品种对茄二十八星瓢虫及瓢虫柄腹姬小蜂的影响结果表明 ,上海紫茄、呼杂 3 4# 、托塔姆 3 # 、洋红茄 4个品种中 ,取食上海紫茄的瓢虫发育历期明显短于取食其它 3个品种的瓢虫。其幼虫-蛹历期比在托塔姆 3 # 上取食的瓢虫发育历期快 5 69d。瓢虫柄腹姬小蜂在取食上海紫茄的瓢虫幼虫内发育出蜂数多、性比高 ,但寄生率稍低。而在托塔姆 3 # 上取食的幼虫内发育出蜂数少、羽化率低、蜂体小、但寄生率稍高。该蜂喜在 3 ,4龄幼虫内寄生 ,在其上寄生蜂出蜂多、性比高。

The effects of eggplant varieties on the growth and development of Henosepilachna vigintioctopunctata and its parasitoid Pediobius foveolatus were examined. The mean development duration of H. vigintioctopunctata was much shorter when fed on the variety Shanghaizhiqie, than if fed on other varieties, the development duration of larva and pupa was 5.69 d faster than when feeding on the variety Toutaomo. When the host larvae fed on Shanghaizhiqie the wasps progeny and sex ratio are the highest but the parasitization ratio was a little lower than in hosts fed on other eggplant varieties. P. foveolatus preferred to parasitise later instars of the host larvae with the fourth instar larvae being the most suitable for P. foveolatus.