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PHOTOPERIOD EFFECTS ON DEVELOPMENT OF THE LARCH CASEBEARER, COLEOPHORA LARICELLA (LEPIDOPTERA: COLEOPHORIDAE)

Published online by Cambridge University Press:  31 May 2012

R. B. Ryan
R. B. Ryan
Affiliation:
Forestry Sciences Laboratory, Pacific Northwest Forest and Range Experiment Station, FS-USDA, Corvallis, Oregon
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Abstract

Long-day (LD = 18 light: 6 dark) and short-day (SD = 12L:12D) photoperiodic treatments of various sequences and durations were applied to Coleophora laricella (Hbn.) larvae at 20 °C. Continuous development did not occur at either constant LD or SD. At LD, growth of young larvae was slow and was suspended in the late second or early third instar. At SD, young larvae developed rapidly but entered diapause in the late third instar. Pupation occurred when LD followed a period at SD. Timing and synchrony of pupation in a population were shown to be controllable by specific LD and SD sequences.

Type
Articles
Information
The Canadian Entomologist , Volume 107 , Issue 12 , December 1975 , pp. 1305 - 1310
Copyright
Copyright © Entomological Society of Canada 1975

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