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LEAF WAXINESS AND THE PERFORMANCE OF LIPAPHIS ERYSIMI (KALTENBACH) (HOMOPTERA: APHIDIDAE) ON THREE BRASSICA CROPS1

Published online by Cambridge University Press:  31 May 2012

R.J. Lamb ,
M.A.H. Smith  and
R.P. Bodnaryk
R.J. Lamb
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
M.A.H. Smith
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
R.P. Bodnaryk
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
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Abstract

The amount of wax on leaf surfaces was determined for waxy and low-wax phenotypes of three Brassica crops: oilseed rape, kale, and collards. The effects of these phenotypes were assessed on the fecundity, settling time, and biomass increase of the mustard aphid, Lipaphis erysimi (Kaltenbach), a pest of oilseed rape. Leaves of the waxy phenotype of each Brassica had about twice as much wax as the low-wax phenotype, but the amount of wax had no effect on any of the three measures of aphid performance. Lipaphis erysimi was more fecund and produced a higher biomass on the rape than on the collards, but settled more quickly on the collards than on rape. If the waxiness of oilseed rape is altered to increase crop resistance to other pests, the pest status of L. erysimi is unlikely to be affected.

Résumé

La quantité de cire sur la surface des feuilles a été évaluée chez des phenotypes cireux et peu cireux de trois espèces de Brassica : colza, chou frisé et chou à rosettes. Les effets de ces phenotypes sur la fécondité, l’établissement et l’augmentation de biomasse du puceron Lipaphis erysimi (Kaltenbach), un parasite du colza, ont été mesurés. Les feuilles du phénotype cireux de chacun des Brassica avaient environ deux fois plus de cire que les phénotypes peu cireux, mais la quantité de cire restait sans effet sur les trois mesures de la performance du puceron. Lipaphis erysimi s’est avéré plus fécond et produisait une quantité de biomasse plus importante sur le colza que sur le chou à rosettes, mais s’est établi plus rapidement sur le chou à rosettes que sur le colza. Si la quantité de cire sur le colza est modifiée pour augmenter la résistance aux autres organismes nuisibles, il est probable que la performance de L. erysimi n’en sera pas affectée.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 125 , Issue 6 , December 1993 , pp. 1023 - 1031
Copyright
Copyright © Entomological Society of Canada 1993

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