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FORECASTING CODLING MOTH PHENOLOGY BASED ON PHEROMONE TRAP CATCHES AND PHYSIOLOGICAL-TIME MODELS

Published online by Cambridge University Press:  31 May 2012

Helmut Riedl
Affiliation:
Department of Entomology, Michigan State University, East Lansing
B. A. Croft
Affiliation:
Department of Entomology, Michigan State University, East Lansing
A. J. Howitt
Affiliation:
Department of Entomology, Michigan State University, East Lansing

Abstract

The relationship of pheromone trap catch to emergence and oviposition of the codling moth was defined for the two-generation climate of Michigan. Catch anticipated emergence and oviposition during spring flight when the trap displayed greatest efficiency, but lagged behind emergence and closely followed oviposition during the second generation. Trapping efficiency declined towards the end of the first generation and was generally lower during summer flight. Factors which possibly relate to this efficiency loss are discussed. First catch and the catch peaks in both generations were evaluated as reference points for the prediction of phenological events (particularly egg hatch) in both generations Of four forecasting methods, degree day and developmental unit summations, starting from first catch, for the preoviposition and incubation period were most reliable in predicting the beginning of spring brood egg hatch.

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Type
Articles
Copyright
Copyright © Entomological Society of Canada 1976

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