Exploiting diapause and cold tolerance to enhance the use of the green lacewing Chrysopa formosa for biological control

文献类型： 外文期刊

第一作者： Wang, Manzi

作者： Wang, Manzi;Gao, Fei;Zhang, Hongzhi;Chen, Hongyin;Wang, Mengqing;Liu, Chenxi;Zhang, Lisheng;Li, Yuyan;Wang, Manzi;Gao, Fei;Zhang, Hongzhi;Chen, Hongyin;Wang, Mengqing;Liu, Chenxi;Zhang, Lisheng

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关键词： Diapause induction; Diapause termination; Sensitive stage; Cold tolerance; Shelf life; Biological control

期刊名称：BIOLOGICAL CONTROL （ 影响因子：3.687； 五年影响因子：3.962 ）

ISSN： 1049-9644

年卷期： 2018 年 127 卷

页码：

收录情况： SCI

摘要： Knowledge of environmental regulation of diapause in the green lacewing Chrysopa formosa, an important polyphagous predator against various pests, is essential for understanding seasonal adaptations of insects and for increasing the shelflife and shipment of chrysopids used in biological control programs. In the present study, we identified environmental factors responsible for induction and termination of diapause and cold tolerance in this chrysopid. C. formosa exhibits a facultative, prepupal diapause within its cocoon. The free-living third instar larva is the stage most sensitive to photoperiodic stimuli. Photoperiod is the major factor governing the induction of prepupal diapause, and temperature exerts amodulating effect. Photoperiodic response curves for C. formosa showed a typical long day response over a wide range of temperatures. Critical daylength for diapause induction was estimated to be 14.3 h at 20 degrees C, with a shift towards short daylengths at higher temperatures. The diapause response was maximal with a short daylength of 8L: 16D at 18 degrees C or 20 degrees C, and no diapause was induced under 16L: 8D at any temperature examined. Chilling temperature had a pronounced effect on the completion of diapause termination and post-diapause development. A chilling period of 60 days or more at 5 degrees C was sufficient to terminate diapause in most prepupae. An increase of chilling exposure duration synchronized post-diapause development and adult emergence. What was particularly attractive is that diapausing chrysopids could be stored at 5 degrees C as long as 300 days with high survival and short adult emergence time. The developmental period prior to diapause was extended significantly for diapause-destined chrysopids. Prepupal diapause in C. formosa distinctly enhanced the cold tolerance. These results suggest mechanisms that could be exploited to improve shelf-life and long distance shipment of chrysopids for release in biological control program.

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