Environmental Entomology (1987) 16, 1141-1144

John W. Neal Jr., Michael J. Raupp and Larry W. Douglass (1987)
Temperature-dependent model for predicting larval emergence of the bagworm, Thyridopteryx ephemeraeformis (Haworth) (Lepidoptera: Psychidae)
Environmental Entomology 16 (5), 1141-1144
Abstract: A temperature-dependent model was developed to predict spring emergence of bagworm, Thyridopteryx ephemeraeformis (Haworth), larvae. Rearing of eggs collected weekly from October through May and then incubated at 26.1°C showed that embryonic synchrony occurred by late January, when variation in larval emergence periods reached a minimum. There was a linear relationship (r² = 0.989) between development rate and temperature between 16.7 and 26.1°C for eggs collected in late January and early February. Larvae required heat accumulations of approximately 380 degree-days (DD) for first median day emergence and 572 DD for last emergence. The average deviation between predicted and observed dates of first emergence was less than one day, but the predicted time for last emergence was greater than the observed time by 5 days or more.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Thyridopteryx ephemeraeformis	Juniper (Juniperus)	U.S.A. (NE)