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GROWTH, DEVELOPMENT, AND SURVIVAL OF THE LARVAE OF THE RED TURNIP BEETLE, ENTOMOSCELIS AMERICANA (COLEOPTERA: CHRYSOMELIDAE), ON BRASSICA CAMPESTRIS AND B. NAPUS (CRUCIFERAE)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

Growth, development, and survival were investigated for the larvae of the red turnip beetle, Entomoscelis americana Brown, fed excised cotyledons or first true leaves of four cultivars of Brassica campestris L. (Torch, Echo, Candle, and R500) or three cultivars of B. napus L. (Midas, Target, and Tower) in the laboratory. The red turnip beetle has four larval instars and its growth curve is S-shaped. The seven cultivars of B. campestris and B. napus tested were suitable host plants for the larvae. On all the cultivars, survival was relatively high, the weights and developmental times were similar, and the percentage of malformed adults was low. In B. campestris and B. napus, the cotyledon stage was marginally better than the first true leaf stage as food for the larvae. Survival usually was higher and in one of the three experiments the adults at emergence were heavier on the cotyledons than on the first true leaves. However, the developmental times were similar, except in one of the three experiments where they were longer on the cotyledons, and the incidence of malformed adults was low on both stages of plant growth.

Résumé

On a étudié en laboratoire la croissance, le développement et la survie des larves de la chrysomèle du navet, Entomoscelis americana Brown, nourrie de cotylédons excisés ou de premières feuilles vraies de 4 cultivars de Brassica campestris L. (Torch, Echo, Candle et R500) ou de 3 cultivars de B. napus L. (Midas, Target et Tower). L’insecte comprend 4 stades larvaires et sa courbe de croissance est sinusoîdale. Les 7 cultivars de B. campestris et de B. napus testés sont acceptables comme plantes hôtes pour les larves. Pour tous les cultivars, la survie est relativement élevée, les poids et les temps de développement sont semblables et le taux d’adultes déformés est faible. Chez B. campestris et B. napus, le stade cotylédon s’avère légèrement plus propice que celui de la première feuille vraie comme nourriture pour les larves. La survie est généralement plus grande et, dans l’une des 3 expériences, les adultes sont plus lourds à l’émergence sur les cotylédons que sur les premières feuilles vraies. Toutefois, les temps de développement sont analogues, sauf dans l’une des 3 experiences où ils sont plus longs sur cotylédons, et la fréquence d’adultes déformés est faible pour les deux stades de croissance végétale.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 5 , May 1981 , pp. 395 - 406
Copyright
Copyright © Entomological Society of Canada 1981

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