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BIONOMICS OF SCYMNUS MARGINICOLLIS (COLEOPTERA: COCCINELLIDAE)1

Published online by Cambridge University Press:  31 May 2012

Linda Anne Buntin  and
George Tamaki
Linda Anne Buntin
Affiliation:
Washington State University, Pullman 99164
George Tamaki
Affiliation:
Washington State University, Pullman 99164
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Abstract

Scymnus marginicollis Mannerheim was reared on green peach aphids, Myzus persicae (Sulzer). At 20°–25 °C and a 16-h photoperiod, durations of egg, larval, and pupal stages were about 5, 10, and 7 days, respectively. Adults survived more than 80 days. The ingestion of wax-producing prey was not required for the beetle larvae to produce their woolly wax covering. Larvae fed exclusively by sucking fluids from appendages of the aphid prey. The coccinellid consumed about 16 adult aphids during the larval stage. Adults fed on fluids and tissues of M. persicae. Female adults consumed about five aphids per day, nearly twice as many as did males. The beetle populations increased in July and reached peak abundance in August. The seasonal trend of S. marginicollis suggests one generation per year.

Résumé

Scymnus marginicollis Mannerheim a été nourrie de puceron vert du pêcher, Myzus persicae (Sulzer). A 20°–25 °C et sous 16 h de photo-période, la durée des stades œuf, larvaires et nymphal a été d’environ 5, 10 et 7 jours respectivement. Les adultes ont survécu pendant plus de 80 jours. L’ingestion de proies produisant de la cire n’a pas été nécessaire aux larves du coléoptère pour la production de leur propre revêtement cireux. La coccinelle a consommé environ 16 adultes du puceron au cours de sa vie larvaire. Les adultes se sont nourris des tissus et fluides corporels de M. persicae. Les femelles adultes ont consommé environ 5 pucerons par jour, soit presque 2 fois plus que les mâles. Les populations du coléoptère ont augmenté en juillet, atteignant leur somme d’abondance en août. La tendance saisonnière de S. marginicollis semble indiquer qu’il y a une génération par année.

Type
Articles
Information
The Canadian Entomologist , Volume 112 , Issue 7 , 01 July 1980 , pp. 675 - 680
Copyright
Copyright © Entomological Society of Canada 1980

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