七星瓢虫卵的低温贮藏条件研究

Low temperature store of Coccinella septempunctata eggs

为了探究七星瓢虫卵的最适低温贮藏条件,本试验研究了七星瓢虫卵在5、7、9和11℃条件下,分别贮藏10、 20和30 d的孵化情况,结果表明七星瓢虫卵在11℃贮藏10 d条件下孵化率最高,可以达到50.67%,进一步分析最适的低温贮藏条件11℃贮藏10 d对七星瓢虫种群适合度的影响。结果显示11℃贮藏10 d对七星瓢虫化蛹率无显著影响。以豌豆修尾蚜为猎物,对其幼虫和成虫的日捕食量进行检测,结果表明七星瓢虫的卵经11℃贮藏10 d后,各个龄期幼虫和成虫的日捕食量与对照组相比无显著差异。但经11℃贮藏10 d后七星瓢虫的发育历期显著缩短,羽化率、产卵量以及子代孵化率显著降低。上述研究结果对利用低温环境提高七星瓢虫的贮藏效率提供一定的理论基础。

To investigate the optimal low temperature store conditions of eggs in Coccinella septempunctata , the hatching rate of eggs were tested after stored in 5, 7, 9 and 11℃ for 10, 20 and 30 days , respectively. Results from this study showed that the highest hatching rate of eggs in C. septempunctata was 50.67% which stored in 11℃ for 10 days. Furthermore,the effect of optimal low temperature store conditions on population fitness of C. septempunctata was also tested in this study. The optimal low temperature store 11℃ for 10 days have no significant difference on pupation rate of C. septempunctata . In addition, the daily feeding amount of each instar larvae and adult of C. septempunctata to prey Megoura japonica was investigated in this study. Results of predation showed that low temperature store 11℃ for 10 days have no significant difference on daily feeding amount as compared with control. However, the developmental duration was significantly shortened,the eclosion rate, fecundity and hatching rate of offspring in C. septempunctata were significantly decreased after stored in the optimal low temperature as compared with their respective control. The results of this study provided theoretical basis for the increase the store efficiency of C. septempunctata utilize low temperature environment.