Effects of photoperiod and temperature on preimaginal development and summer diapause of Chrysocharis pubicornis(Zetterstedt)(Hymenoptera: Eulophidae), a pupal parasitoid of leafminers(Diptera: Agromyzidae)

概要

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The preimaginal development of Chrysocharis pubicornis was studied at different temperatures and 14L:10D photoperiod. The lower developmental threshold was 7.4 and 7.2℃, and the thermal constant was 297.4 and 307.5 degree-days for males and females, respectively. The effects of combinations of different temperatures and photoperiods on larval diapause induction and termination were also examined. Larval development showed a short-day type response affected by temperature. The percentage of individuals entering diapause increased with the temperature and photoperiod. The critical photoperiod for diapause induction was between 12 and 14h at 25℃, whereas at 15h and 20℃ the diapause rate did not reach 50% within the photoperiod range tested. Regardless of the photoperiod, diapause terminated at 15℃ but was maintained at 25℃. At 20℃, 90% of individuals terminated diapause at 12h photoperiod but only 16% at 16h photoperiod. A significant effect of the photoperiod on the post-diapause emergence pattern of wasps was observed at 15℃. From these results, it is considered that summer diapause enables C. pubicornis to synchronize its occurrence with that of the garden pea leafminer, Chromatomyia horticola.
日本応用動物昆虫学会の論文
2007-05-25