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THE SUITABILITY OF NINE SPECIES OF CRUCIFERAE AS HOSTS FOR THE LARVAE OF THE RED TURNIP BEETLE, ENTOMOSCELIS AMERICANA (COLEOPTERA: CHRYSOMELIDAE)12

Published online by Cambridge University Press:  31 May 2012

G. H. Gerber  and
A. A. Obadofin
G. H. Gerber
Affiliation:
Research Station, Agriculture Canada, Winnipeg, Manitoba R3T 2M9
A. A. Obadofin
Affiliation:
Research Station, Agriculture Canada, Winnipeg, Manitoba R3T 2M9
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Abstract

The suitability of nine species of Cruciferae as hosts for the larvae of the red turnip beetle, Entomoscelis americana Brown, was tested in the laboratory using excised cotyledons or true leaves as food and rape (Brassica campestris L.) as the standard. The three types of commercial mustards grown in Canada (yellow-seeded (oriental mustard) and brown-seeded (brown mustard) forms of Brassica juncea (L.) Czern.; and yellow mustard, B. hirta Moench) and three weeds (Capsella bursa-pastoris (L.) Medic, shepherd’s purse; Erucastrum gallicum (Willd.) O.E. Schulz, dog mustard; and Sinapis arvensis L., wild mustard) were suitable food plants. Brassica nigra (L.) Koch (black mustard), Descurainia sophia (L.) Webb (flixweed), and Sisymbrium loeselii L. (tall hedge mustard) were marginally suitable. Thlaspi arvense L. (stinkweed) was a non-host plant. These observations suggest that an important element of the pest management system for the red turnip beetle should be the elimination of volunteer commercial mustards and the cruciferous weeds, except T. arvense, in April and May to prevent population build-up.

Résumé

L’acceptabilité de 9 espèces de Crucifères comme hôtes des larves de la chrysomèle du navet, Entomoscelis americana Brown, a été évaluée en laboratoire au moyen de cotylédons excisés ou de premières feuilles vraies comme nourriture et de la navette (Brassica campestris L.) comme témoin. Les 3 types de moutarde commerciale cultivés au Canada (formes à graine jaune (moutarde orientale) et brune (moutarde brune) de Brassica juncea (L.) Czern., la moutarde jaune, B. hirta Moench), ainsi que les trois mauvaises herbes Capsella bursa-pastoris (L.) Medic (bourse-à-pasteur), Erucastrum gallicum (Willd.) O.E. Schulz (moutarde des chiens) et Sinapis arvensis L. (moutarde sauvage) se sont avérés acceptables comme nourriture. En revanche, Brassica nigra (L.) Koch (moutarde noire), Descurainia sophia (L.) Webb (sisymbre Sophia) et Sisymbrium loeselii L. (sisymbre de Loesel) sont marginalement acceptables, tandis que Thlaspi arvense L. (tabouret des champs) constitue un mauvais hôte. Ces observations donnent à penser qu’un élément important du système de lutte antiparasitaire raisonnée contre la chrysomèle devrait être l’élimination des moutardes commerciales spontanées et des mauvaises herbes crucifères, sauf T. arvense, en avril et mai pour prévenir toute pullulation de l’insecte.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 5 , May 1981 , pp. 407 - 413
Copyright
Copyright © Entomological Society of Canada 1981

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