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PHAGODETERRENCY INDUCED BY TWO CRUCIFEROUS PLANTS IN ADULTS OF THE FLEA BEETLE PHYLLOTRETA STRIOLATA (COLEOPTERA: CHRYSOMELIDAE)

Published online by Cambridge University Press:  31 May 2012

J. Meisner  and
B. K. Mitchell
J. Meisner
Affiliation:
Department of Entomology, University of Alberta, Edmonton T6G 2E3
B. K. Mitchell
Affiliation:
Department of Entomology, University of Alberta, Edmonton T6G 2E3
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Abstract

The two cruciferous plants Thlaspi arvense and Lunaria annua are largely unacceptable to the striped flea beetle, Phyllotreta striolata, which normally feeds on cruciferous plants. Results suggest that these plants contain chemical compounds that act as feeding deterrents to the beetles. Methanol fractions of the leaves of both plants deterred feeding when added to the surface of acceptable radish leaves. An alkaloid fraction of Lunaria annua was, surprisingly, not deterrent. Evidence suggests that saponins in both Lunaria annua and Thlaspi arvense may be a major reason for the low acceptability of these plants as food for Phyllotreta striolata. Commercial saponins are highly deterrent at concentrations of 0.05% and above.

Résumé

Deux crucifères, Thlaspi arvense et Lunaria annua, sont pratiquement inacceptables comme hôtes pour l'altise Phyllotreta striolata qui se nourrit normalement sur les crucifères. Les résultats indiquent que ces plantes contiennent des substances inhibitrices de l'alimentation pour ces insectes. Les fractions méthanoliques obtenues du feuillage des 2 plantes ont inhibé l'alimentation lorqu'appliquées à la surface des feuilles normalement acceptables du radis. Fait surprenant, une fraction alkaloïde s'est avérée non-inhibitrice. Les observations indiquent que des saponines présentes chez Lunaria annua et Thlaspi arvense pourraient expliquer en grande partie la faible acceptabilité de ces plantes comme nourriture pour Phyllotreta striolata. Des saponines commerciales s'avèrent hautement inhibitrices aux concentrations de 0.05% ou plus.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 9 , September 1983 , pp. 1209 - 1214
Copyright
Copyright © Entomological Society of Canada 1983

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