Photoperiodic Induction, Maintenance and Termination of Winter Diapause in Two Geographic Ecotypes of the Rice Stem Maggot, Chlorops oryzae MATSUMURA (Diptera: Chloropidae)

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The sensitivity of Chlorops oryzae MATSUMURA to photoperiod in controlling winter diapause was studied by changing photoperiod at various stages. A short day (12 h) in the egg stage induced a winter diapause in the first larval stadium. The latter half of the egg stage was most sensitive to the diapause inducing photoperiod. Short days in the larval stage maintained diapause, but long days terminated it. In the bivoltine strain (39^○N), three short-day cycles were required to induce diapause when the egg stage lasted for 9 days. The critical photoperiod during the egg stage for the induction of diapause was about LD14:10. The duration of diapause under LD12:12 was 80 to 90 days. The critical photoperiod in the larval stage for the maintenance of diapause was about LD14:10. Winter diapause in the viboltine strain sampled in December was maintained under LD12:12, but short and long days had similar effects on development when insects were sampled in January. In the trivoltine strain (35^○N), 4 short-day cycles were required to induce diapause when the egg stage was 9 days. The critical photoperiod for the induction and maintenance of diapause at 20℃ was about LD13:11. The duration of diapause under LD12:12 was 50 to 60 days.
日本応用動物昆虫学会の論文
1996-08-25