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INFLUENCE OF APPLE CULTIVAR, TREE PHENOLOGY, AND LEAF QUALITY ON THE DEVELOPMENT AND MORTALITY OF CHORISTONEURA ROSACEANA (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

David W. Onstad ,
W. Harvey Reissig  and
Christine A. Shoemaker
David W. Onstad
Affiliation:
Department of Entomology, New York State Agricultural Experiment Station, Cornell University, Geneva, New York, USA 14456
W. Harvey Reissig
Affiliation:
Department of Entomology, New York State Agricultural Experiment Station, Cornell University, Geneva, New York, USA 14456
Christine A. Shoemaker
Affiliation:
Department of Environmental Engineering, Cornell University, Ithaca, New York, USA
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Abstract

The obliquebanded leafroller, Choristoneura rosaceana (Harris), is a polyphagous insect that is occasionally a serious pest of apple trees. To determine how well adapted it is to this host plant, we studied its nutritional ecology by measuring the development and mortality of larvae and pupae reared on different sets of leaves. We investigated the influence of 3 apple cultivars, 2 time periods (June, July–August), and several leaf types, including those with different ages and different branch positions, on these processes. Larvae and pupae developed more rapidly with lower mortality on younger leaves than on older ones. When larvae were fed leaves collected from the same cultivar and branch position at different times during the season, developmental rates were faster and survival rates were higher earlier in the season. Development and survival were similar on leaves of all cultivars.

Résumé

La tordeuse à bandes obliques, Choristoneura rosaceana (Harris), est un insecte polyphage qui est occasionnellement très nuisible dans les pommeraies. Afin d’établir jusqu’à quel point il est bien adapté au pommier, on a étudié son écologie nutritionnelle en mesurant le développement et la mortalité des larves et des pupes obtenues avec différents feuillages. On a étudié les effets, sur ces processus, de 3 cultivars du pommier, 2 périodes de l’été (Juin et Juillet–Août) et plusieurs types de feuilles, y compris des feuilles d’âges différents et occupant des positions différentes sur les branches. Les larves et les pupes se sont développées plus rapidement et avec un meilleur taux de survie sur du feuillage jeune plutôt qu’âgé. Lorsque les larves ont été nourries de feuillage cueilli tôt en saison, les vitesses de développement et taux de survie ont été supérieurs à ceux obtenus avec du feuillage cueilli plus tard. Le développement et la survie se sont avérés similaires sur le feuillage des différents cultivars.

Type
Articles
Information
The Canadian Entomologist , Volume 118 , Issue 2 , February 1986 , pp. 123 - 132
Copyright
Copyright © Entomological Society of Canada 1986

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