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PREDICTING ECLOSION OF OVERWINTERING EGGS OF THE EUROPEAN RED MITE, PANONYCHUS ULMI (ACARINA: TETRANYCHIDAE), IN NOVA SCOTIA1

Published online by Cambridge University Press:  31 May 2012

H. J. Herbert  and
K. B. McRae
H. J. Herbert
Affiliation:
Agriculture Canada, Research Station, Kentville, Nova Scotia B4N 1J5
K. B. McRae
Affiliation:
Agriculture Canada, Research Station, Kentville, Nova Scotia B4N 1J5
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Abstract

Eclosion of overwintering eggs of the European red mite, Panonychus ulmi (Koch), in Nova Scotia was studied at four constant temperatures. Days to 50% hatch were 44.8, 23.1, 12.9, and 8.8 while the rates of development were 2.18, 4.53, 7.59, and 11.34% per day at 8°, 12°, 16 °and 20 °C, respectively. Nonlinear equations were developed to estimate the time to 50% hatch of overwintering eggs as a function of temperature. A weighted average of the daily extreme temperatures was used to improve the estimated time to 50% hatch for field data from the rates of development in the constant temperature studies.

Résumé

L'éclosion des oeufs hivernants du tétranyque rouge du pommier, Panonychus ulmi (Koch), en Nouvelle-Écosse a été étudiée à quatre températures constantes. L'intervalle en jours entre le début et 50% d'éclosion est de 44.8, 23.1, 12.9 et 8.8, alors que les taux de développement sont de 2.18, 4.53, 7.59 et 11.34% par jour à 8, 12, 16 et 20 °C respectivement. On a élaboré des équations non linéaires pour estimer l'intervalle de temps du début à 50% d'éclosion des oeufs hivernants en fonction de la température. On a utilisé une moyenne pondérée des extrêmes quotidiens de température pour améliorer l'intervalle ainsi estimé pour les données recueillies sur le terrain à partir des taux de développement trouvés dans les études à températures constantes.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 8 , August 1982 , pp. 703 - 712
Copyright
Copyright © Entomological Society of Canada 1982

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