龟纹瓢虫Propylaea　Japonica(Thunberg)生物学特性研究初报

Researeh on Traits of Biology of Propylaea Japonica (Thunberg)

对龟纹瓢虫PropylaeaJaponica（Thunberg）进行了田间观察和室内研究，结果表明，龟纹瓢虫在通辽地区一年发生3—4代，以成虫在土缝、作物根际、背风向阳的场所越冬。一代卵期3—4天，幼虫期7．5—11天，蛹期3．5—4天，成虫期较长。世代重叠现象严重。一次交配多次产卵，每次产卵11—22粒。其幼虫、成虫捕食性较强。成虫每昼夜捕食麦蚜76头左右，老龄幼虫每昼夜捕食麦蚜45头左右，幼虫食蚜量随湿度升高而显著增加。是蚜虫、介壳虫等很好的天敌昆虫。

The results of field experiment and laboratory study on Propylaea Japonica showed that this inseet had 3 - 4 generations every year in Tong Liao area, adult hebenated in clink, croproot and face south place. A inseet was seperated egg stage(3-4 ) days, larve stage(7. 3 - 11 )days, pupa stage (3. 5 - 4)days and adult had longer days than others. Every generation had overlapping hardly, each mating had many tinies oviposition and each ovipositcon had (12 - 22)eggs.Larve and adult have hard predatory. An adult predated 76 wheat aphis and old larve was 45.Larve predator number increased with the temperture high that was very suitable natural inseet tophytophthira and scale