Photoperiodic Control of Adult Diapause in the Bean Bug, Riptortus clavatus THUNBERG (Heteroptera : Coreidae) : III. Diapause Development and Temperature

Abstract

Diapause development in Riptortus clavatus proceeded gradually under a diapausemaintaining short-day photoperiod, being affected a little by temperature within a range of 10-25°C. The critical daylength for prompt diapause termination was lowered and the preoviposition period after transfer to diapause-terminating long-day photoperiods was shortened as the diapause development proceeded. These results suggest that the critical daylength decreases below the natural deylength in winter, and the long-day photoperiodsin spring do not therefore appear to play a role in diapause termination in the field.