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EFFECTS OF ROOT DAMAGE BY CABBAGE MAGGOT, DELIA RADICUM (L.) (DIPTERA: ANTHOMYIIDAE), ON YIELD OF CANOLA, BRASSICA CAMPESTRIS L., UNDER LABORATORY CONDITIONS

Published online by Cambridge University Press:  31 May 2012

R.S. McDonald  and
M.K. Sears
R.S. McDonald
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
M.K. Sears
Affiliation:
Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1
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Abstract

The effects of root damage by larval cabbage maggots, Delia radicum (L.), on yield of canola, Brassica campestris L., were examined in laboratory experiments. Inoculations of eggs or first-instar larvae resulted in significant root damage. Damage that exceeded 50% of taproot surface area resulted in fewer racemes, fewer productive seed pods on axillary racemes, lower total biomass, and reduced yield of seed. Despite the latter effect, damage that restricts the number of flowering racemes and induces abortion of seed on axillary racemes may increase the efficiency of yield in canola, which flowers indeterminately over a short growing season.

Résumé

Les effects de l’endommagement des racines du colza canola Brassica campestris L., occasionnes par la larve de la mouche du chou, Delia radicum (L.), et ses effets sur le rendement du canola, ont fait l’object d’expérimentations en laboratoire. Des innoculations de densités comparables d’ouefs ou de premiers stades larvaires ont eu comme résultat des dommages significatifs sur les racines en question. Quand les dégats excédaient 50% de la surface de la racine pivotant, les résultats suivants furent constates : moins de racemes, moins de cossess a graines productives sur les racèmes auxilliaires, une bio-masse totale moins importante, et un rendement réduit de graines. Malgré ce dernier effect, les dommages qui limitent le nombre de racèmes fleurissants, et qui induisent l’avortement des grains sur les racèmes auxilliares, peuvent augmenter l’efficience du rendement du canola, qui fleurit de maniere indéterminée pendant une courte saison.

Type
Articles
Information
The Canadian Entomologist , Volume 123 , Issue 4 , August 1991 , pp. 861 - 867
Copyright
Copyright © Entomological Society of Canada 1991

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