Effects of Photoperiod on Nymphal Development, Pre-Oviposition Period and Egg Diapause in the Subtropical Rice Grasshopper, Oxya chinensis formosana SHIRAKI (Orthoptera: Catantopidae).

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Oxya chinensis formosana from Okinawa Is. responded to photoperiod in various ways at 25°C. The nymphal duration was shorter at LD12:12 than at LD14:10. The number of nymphal stadia was 5 or 6 in the male and 6 in the female at LD12:12, but 6 in the male and 6 or 7 in the female at LD14:10. Females reared at LD14:10 throughout post-embryonic development oviposited later than those reared at LD12:12 throughout the study and those transferred from LD12:12 to LD14:10 (or vice versa) on adult emergence. Some eggs entered diapause when incubated at 25°C irrespective of the parental photoperiods. the incidence of egg diapause was lowered by an increase in photoperiod from LD12:12 to LD14:10 on adult emergence. These results suggest that a ;majority of the population have a heterodynamic life cycle with a short-day type photoperiodic response controling both nymphal development and reproduction, and also with diapause in a portion of the eggs.
日本応用動物昆虫学会の論文