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EFFECTS OF FLEA BEETLES, PHYLLOTRETA SPP. (CHRYSOMELIDAE: COLEOPTERA), ON THE SURVIVAL, GROWTH, SEED YIELD AND QUALITY OF CANOLA, RAPE AND YELLOW MUSTARD1

Published online by Cambridge University Press:  31 May 2012

Robert J. Lamb
Robert J. Lamb
Affiliation:
Research Station, Agriculture Canada, Winnipeg, Manitoba R3T 2M9
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Abstract

The effects of damage by natural infestations of the flea beetles Phyllotreta cruciferae (Goeze) and Phyllotreta striolata (F.) on field plots of canola, rape (Brassica napus L.), and yellow mustard (Sinapis alba L.) are described. Damage occurred primarily during the first few weeks after emergence: seedling mortality was high during the first week and growth was reduced during at least the first 2 weeks. This early damage delayed plant development, caused unevenness in height and maturity, and reduced seed yield and raised the chlorophyll content of the seed.

Comparison among tests and treatments showed that a later-seeded test suffered less damage, and that carbofuran-treated plots were better protected than lindane-treated plots although the latter suffered slightly lower plant mortality. Yellow mustard showed a high level of resistance to flea beetle damage in comparison to rape and canola. Small differences in susceptibility were detected among three cultivars of B. napus.

Résumé

L'auteur décrit les effets des dégâts dus à des infestations naturelles des altises Phyllotreta cruciferae (Goeze) et Phyllotreta striolata (F.) dans des parcelles de colza Canola, de colza (Brassica napus L.) et de moutarde jaune (Sinapis alba L.). Les dégâts surviennent principalement au cours des premières semaines suivant l'émergence, car la mortalité des plantules est élevée durant la première semaine et la croissance est réduite au moins au cours des deux premières semaines. Ces dégâts retardent le développement des plants, entraînent une inégalité de hauteur et de maturité, réduisent le rendement grainier et élèvent la teneur en chlorophylle de la graine.

La comparaison entre les essais et les traitements révèlent qu'un semis tardif est moins endommagé et que les parcelles traitées au carbofuran sont mieux protégées que celles traitées au lindane, même si celles-ci affichent une mortalité des plants légèrement inférieure. La moutarde jaune manifeste une grande résistance aux dégâts par les altises si on la compare au colza et au colza Canola. On décèle de légères différences de sensibilité parmi trois cultivars de B. napus.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 2 , February 1984 , pp. 269 - 280
Copyright
Copyright © Entomological Society of Canada 1984

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