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EFFECT OF SPACING AND CLUMPING OF CORN PLANTS ON DENSITY OF CORN-ROOTWORM LARVAE (COLEOPTERA: CHRYSOMELIDAE) PER ROOT SYSTEM

Published online by Cambridge University Press:  31 May 2012

Olga Piedrahita ,
C. R. Ellis  and
O. B. Allen
Olga Piedrahita
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario NlG 2W1
C. R. Ellis
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario NlG 2W1
O. B. Allen
Affiliation:
Department of Mathematics and Statistics, University of Guelph, Guelph, Ontario N1G 2W1
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Abstract

The relative density of corn-rootworm larvae was estimated in two field plots with 4 different plant spacings and with up to 4 plants clumped per location. In both fields the relationship between plant spacing and the number of corn rootworms per sample was similar with the maximum number of larvae occurring when plants were 46 or 50 cm apart. The number of plants clumped per location affected the numbers of corn rootworm in only one field. The relationship between clumping of plants and number of corn rootworms was curvilinear in this field with the most corn rootworms occurring at 3 plants per location.

Résumé

La densité relative de larves de la chrysomèle des racines du maïs a été évaluée sur 2 parcelles expérimentales avec 4 espacements différents entre les plantes et avec une densité de plantes jusqu'à 4 plantes regroupées par site. Dans les 2 parcelles, l'espacement entre les plantes et le nombre de chrysomèles des racines du maïs par échantillon présentaient une relation curviligne avec un nombre maximum de larves retrouvées lorsque l'espacement entre les plantes était de 46 ou 50 cm. Dans une parcelle seulement le nombre de plantes regroupées par site a influé le nombre de chrysomèles des racines du maïs. Dans cette parcelle le regroupement des plantes et le nombre de chrysomèles des racines du maïs montraient une relation curviligne, le plus grande nombre de larves étant retrouvé à une densité de 3 plantes par site.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 2 , February 1985 , pp. 139 - 142
Copyright
Copyright © Entomological Society of Canada 1985

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