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THE INFLUENCE OF COMPANION HERBS ON EGG DISTRIBUTION OF THE IMPORTED CABBAGEWORM, PIERIS RAPAE (LEPIDOPTERA: PIERIDAE), ON COLLARD PLANTS1

Published online by Cambridge University Press:  31 May 2012

M. A. Latheef  and
J. H. Ortiz
M. A. Latheef
Affiliation:
Department of Agriculture, Virginia State University, Petersburg, Virginia 23803
J. H. Ortiz
Affiliation:
Department of Agriculture, Virginia State University, Petersburg, Virginia 23803
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Abstract

The effect of interplanting collards with a mixture of herbs on oviposition of the imported cabbageworm, Pieris rapae (L.), was investigated at Chesterfield Co., Virginia during 1981 and 1982. Analysis of the dispersion indices of the insect using Taylor's power law and Iwao's model revealed that P. rapae eggs were significantly — m (P < 0.001) clumped (b > 1) on collards interplanted with herbs. However, insect counts on control collards conformed to the Poisson distribution (b = 1, P > 0.05). Pieris rapae laid significantly (P < 0.01) more eggs on collards hidden between sage than on collards hidden between other companion plants. Also, P. rapae laid significantly (P < 0.005) more eggs on collards bordered by companion plants than on non-bordered control. These data suggest that companion herbs did not repel P. rapae but instead significantly encouraged colonization of the insect and produced an aggregated distribution.

Résumé

L'effet de semer du chou collard en alternance avec des herbes mélangées sur la ponte de Pieris rapae (L.) a été étudié dans le Comté de Chesterfield en Virginie, en 1981 et 1982. L'analyse des indices de dispersion de l'insecte utilisant la loi des facteurs de Taylor et le modèle d'Iwao a révélé que les oeufs de P. rapae étaient significativement (p < 0.001) groupés (b > 1) sur les choux accompagnés d'herbes. Les nombres d'insectes sur des choux témoins étaient conforme à la distribution de Poisson (b = 1, p >.05). P. rapae a pondu significativement plus d'oeufs (p < 0.01) sur des choux espacés de sauge, que sur des choux espacés d'autres plantes compagnes. De plus, P. rapae a pondu significativement plus d'oeufs (p < 0.005) sur du chou situé parmi des plantes compagnes que sur les témoins en semis pur. Ces données indiquent que les herbes compagnes n'ont pas eu d'effet répulsif sur P. rapae, augmentant plutôt la colonisation par l'insecte tout en causant une distribution groupées.

Type
Articles
Information
The Canadian Entomologist , Volume 115 , Issue 8 , August 1983 , pp. 1031 - 1038
Copyright
Copyright © Entomological Society of Canada 1983

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