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BIOLOGY OF ANCYLIS DISCIGERANA (LEPIDOPTERA: TORTRICIDAE)1

Published online by Cambridge University Press:  31 May 2012

Susan H. Claflin  and
Douglas C. Allen
Susan H. Claflin
Affiliation:
Department of Environmental and Forest Biology, State University of New York, College of Environmental Science and Forestry, Syracuse 13210
Douglas C. Allen
Affiliation:
Department of Environmental and Forest Biology, State University of New York, College of Environmental Science and Forestry, Syracuse 13210
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Abstract

Ancylis discigerana (Walker) is a univoltine leaf folder of yellow birch. Final instar larvae overwinter in litter and pupate from mid-April through mid-May. Adults emerge in early June and deposit single eggs on the upper surface of a leaf, usually on a major leaf vein or other small depression in the epidermis. The first two instars skeletonize the lower surface of a leaf, beneath a sheet of silk that is constructed between two lateral veins. Third-instar larvae move to the upper surface of a different leaf and fold it lengthwise. Larvae feed on the upper epidermis within the fold until leaf-fall. Life stages are described.

An egg parasitoid, Trichogramma minutum Riley, and a larval parasitoid, Apanteles polychrosidis Viereck, were the major natural enemies in the population studied.

A key is presented for three species of Ancylis found on yellow birch.

Résumé

Ancylis discigerana (Walker) est une espèce univoltine plieuse de feuilles sur le bouleau jaune. Les larves du dernier stade hivernent dans la litière et se nymphosent de la mi-avril à la mi-mai. Les adultes émergent tôt en juin et déposent leurs œufs individuellement sur le dessus des feuilles, habituellement sur une grosse nervure ou dans toute autre dépression légère de l’épiderme. Les deux premiers stades "squelettisent" la face inférieure des feuilles, cachées sous une toile de soie tissée entre deux nervures. Les larves de stade trois se déplacent sur la face supérieure d’une nouvelle feuille laquelle est pliée longitudinalement. Les larves se nourrissent sur l’épiderme supérieur dans le repli jusqu’à la chute des feuilles. Les stades du cycle vital sont décrits.

Un parasitoide des oeufs, Trichogramma minutum Riley, et un parasitoide des larves, Apanteles polychrosidis Viereck, étaient les principaux ennemis naturels dans la population étudiée.

Une clé est fournie pour les trois espèces d’Ancylis vivant sur le bouleau jaune.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 4 , April 1981 , pp. 265 - 270
Copyright
Copyright © Entomological Society of Canada 1981

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