Acta Entomologica Sinica (2009) 52, 651-655

Xing-Ping Liu, Shao-Hui Wu, Hai-Min He and Fang-Sen Xue (2009)
[Induction of summer diapause in the cabbage beetle, Colaphellus bowringi (Coleoptera: Chrysomelidae) based on a quantitative photoperiodic response]
Acta Entomologica Sinica 52 (6), 651-655
Abstract: To understand the nature of photoperiodic time measurement in the induction of summer diapause of the cabbage beetle, Colaphellus bowringi Baly, the incidence of summer diapause of C. bowringi under different long day-lengths and the number of light-dark cycles required to induce 50% individuals to enter summer diapause at 25°C was investigated in the laboratory. The results showed that the incidences of summer diapause induced by different long day-lengths were different significantly. The incidence of diapause induced by day-length of 15 h or 16 h was the highest, and the incidence of diapause significantly declined when the day-length was longer or shorter than 15 h or 16 h. In the transferring experiments of different light-dark cycles, the incidence of diapause induced by the day-length of 14 h did not exceed 50%. The number of light-dark cycles required to induce 50% individuals to enter summer diapause was 2.61 d at L15:D9, 3.72 d at L16:D8, 4.64 d at L17:D7 and 5.92 d at L18:D6, showing significant differences between the treatments. The results suggest that the induction of summer diapause in this beetle is based on a quantitative photoperiodic response.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Fang Sen Xue

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Colaphellus bowringi