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Differences in thermal requirements for diapause termination in 2 western choristoneura spp lepidoptera tortricidae


, : Differences in thermal requirements for diapause termination in 2 western choristoneura spp lepidoptera tortricidae. Canadian Entomologist 109(11): 1469-1474

Storage of diapausing larvae of C. viridis and C. occidentalis at low temperature (2.degree. C) appeared to be sufficient stimulus to terminate diapause. Reactivation at 25.degree. C occurred sooner and was more synchronous with longer storage at 2.degree. C. Highest survival was obtained after storage of 20-22 wk for both C. viridis and C. occidentalis. Intraspecific and interspecific reactivation rates were compared by analysis of covariance, using the model ln Y = a + B ln X, where Y = larval emergence in days at 25.degree. C and X = storage in weeks at 2.degree. C. Intraspecific sex differences were not significant, indicating that protandry observed in this laboratory in both species must be due to some other factor. C. viridis had substantially less stringent thermal requirements for diapause termination than C. occidentalis. Diapause in the 2 spp. is discussed.

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