ARAI, Tetsuo (Lab.Entomol., Fac.Agr., Hirosaki Univ., Hirosaki). 1978. Effects of environmental conditions on the wing form and growth in Gryllodes sigillatus WALKER (Orthoptera : Gryllidae).Jap.J.Ecol., 28 : 135-142. The wing form and growth in Gryllodes sigillatus WALKER were observed under various conditions of temperature, photoperiod, and rearing density. The incidence of macropterous adults under crowded conditions increased raising temperature and density. Macropterous adults appeared, however, even under isolated conditions, if adequate photoperiodic and temperature stimuli were provided. The effect of photoperiod on the induction of macropterous form differed at different temperature. Namely, the incidence of macropterous form was generally low at 25℃ irrespective of photoperiod, but it increased in LD 13 : 11,19 : 5-23 : 1 at 30℃ and LD 4 : 20-7 : 17,13 : 11,21 : 3-23 : 1 at 35℃. On the other hand, the effect of photoperiod on nymphal growth was not detected at 30 and 35℃, but a long day type response was discernible at 25℃ at least within the range of natural photoperiods. The macropterous form took a longer time to mature than the micropterous form at 35℃. The nymphal development under isolated conditions was remarkably delayed by a low temperature (27℃) and short day-length (LD 11 : 13).
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