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REPRODUCTIVE CYCLES OF THE RED TURNIP BEETLE, ENTOMOSCELIS AMERICANA BROWN (COLEOPTERA: CHRYSOMELIDAE)1

Published online by Cambridge University Press:  31 May 2012

G.H. Gerber
G.H. Gerber
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
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Abstract

The reproductive cycles of the red turnip beetle, Entomoscelis americana Brown, were studied in the field in Manitoba from 1974 to 1978. Vitellogenesis is initiated within the first 3 days after emergence from aestivation in early August. Oviposition begins soon after the first eggs are developed, usually within the first 8 days after emergence. The rate of egg laying reaches a peak within 2 weeks after the initiation of oviposition and then declines gradually during the remainder of the oviposition period. Almost all eggs were laid between mid-August and mid-October. The average numbers of eggs laid per mated female in three oviposition studies were as follows: 1 female per cage (1974), 254±74 (±SE) (range, 11–696); 1 female per cage (1976), 273±47 (range, 0–622); and 25 females per cage (1974), 426±3 (range, 392–462). The most eggs were laid at the lowest temperature regime tested (6–20°C; mean, 12°C). Copulation is initiated in males and females during the 1st day after emergence from aestivation and both mate many times. Stimuli associated with copulation and (or) insemination enhance egg output, but are not required for the initiation of vitellogenesis and oviposition. Males transfer sufficient spermatozoa to the females during the first one or more copulations that occur during the first 8 days after emergence to fertilize almost all eggs produced. A system for classifying the stages of oocyte development is described.

Résumé

Les cycles reproducteurs de la chrysomèle du navet, Entomoscelis americana Brown, ont été étudiés sur le terrain au Manitoba de 1974 à 1979. La vitellogenèse commence dans les 3 premiers jours suivant l’émergence de l’estivation au début d’août. L’oviposition commence peu après la formation des premiers oeufs, généralement dans les 8 premiers jours après l’émergence. Le taux de ponte atteint un pic dans les 2 semaines suivant le début de l’oviposition et régresse ensuite graduellement pendant le reste de la période de ponte. Presque tous les oeufs sont pondus entre la mi-août et la mi-octobre. Le nombre moyen d’oeufs pondus par femelle fécondée dans trois études de ponte s’établit comme suit : 1 femelle par cage (1974), 254±74 (± ET) (écart de 11 à 696);1 femelle par cage (1976), 273±47 (écart de 0 à 622); et 25 femelles par cage (1974), 426±3 (écart de 392 à 462). La plupart des oeufs sont pondus au plus faible régime de température d’essai (6 à 20°C; moyenne de 12°C). La copulation commence chez les mâles et les femelles le premier jour après l’émergence de l’estivation et les deux sexes copulent plusieurs fois. Les stimuli associés à la copulation et (ou) à l’insémination favorisent la production d’oeufs, mais ne sont pas nécessaires pour provoquer la vitellogenèse et l’oviposition. Les mâles transfèrent suffisamment de spermatozoïdes aux femelles au cours de la première copulation ou des copulations subséquentes qui se produisent pendant les 8 premiers jours après l’émergence pour fertiliser presque tous les oeufs produits. L’auteur décrit un système de classification des stades de développement des oocytes.

Type
Articles
Information
The Canadian Entomologist , Volume 119 , Issue 12 , December 1987 , pp. 1069 - 1079
Copyright
Copyright © Entomological Society of Canada 1987

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