关键词: 德国小蠊, 温度, 光周期, 滞育, 生活史节律

Abstract:

Objective To understand the temperature and photoperiod response model of Blattella germanica, and the effect of temperature and photoperiod on their growth and development, reproduction and life cycle rhythm, providing a theoretical basis for the development of effective control strategies. Methods Tests were done in an environmental test chamber. Five temperature gradients at 16, 18, 22, 26 and 30 ℃ were set in the light cycle of LD12 h:12 h (light intensity of 4000 lx), and the photoperiod LD16 h:8 h, LD12 h:12 h, LD8 h:16 h and LD0:24 h set at 26 ℃. Results It was found that in a constant photoperiod (LD12 h:12 h) the nymph stage development rate corresponded with the following temperature gradients 30 ℃> 26 ℃>22 ℃>18 ℃>16 ℃, and the nymph emergence rate decreased with the lowering of the temperature. Also, the nymph stage development rate corresponded to the following photoperiod LD16 h:8 h>LD12 h:12 h>LD8 h:16 h>LD0:24 h at a constant temperate of 26 ℃, with the nymph emergence rate decreasing with the reduction in irradiation time. Conclusion The photoperiod response model of B. germanica is of photoperiodic long-day type. The nymph stage is important in the life cycle of B. germanica. The impact of temperature and photoperiod interaction on B. germanica results in the occurrence of diapause, impairing its development period, emergence and reproduction, and thus life cycle rhythm.

Key words: Blattella germanica, Temperature, Photoperiod, Diapause, Life cycle rhythm