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SEASONAL OCCURRENCE AND RELATIVE ABUNDANCE OF APHID PREDATORS AND PARASITOIDS ON PUBESCENT POTATO PLANTS

Published online by Cambridge University Press:  31 May 2012

John J. Obrycki  and
Maurice J. Tauber
John J. Obrycki
Affiliation:
Department of Entomology, Cornell University, Ithaca, New York, USA 14853
Maurice J. Tauber
Affiliation:
Department of Entomology, Cornell University, Ithaca, New York, USA 14853
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Abstract

During 2 field seasons, Coccinellidae (primarily Coccinella transversoguttata richardsoni, Coleomegilla maculata, Hippodamia convergens, H. tridecimpunctata, and H. glacialis) were the most abundant predators on potato hybrids (Solanum tuberosum × S. berthaultii, F3) with various densities of glandular pubescence. Highly pubescent clones had the highest percentage of predator eggs, while clones with the lowest trichome densities had the highest percentages of immature and adult predators. By comparison, high numbers of aphid parasitoid mummies (primarily Aphidius and Praon spp.) occurred on clones with moderate to high densities of glandular pubescence. During both years, predators and parasitoids were most abundant in late July and August.

Résumé

Au cours de 2 saisons de croissance, les Coccinellidae (surtout Coccinella transversoguttata richardsoni, Coleomegilla maculata, Hippodamia convergens, H. tridecimpunctata et H. glacialis) se sont avérés les prédateurs les plus abondants sur des hybrides de pomme de terre (Solanum tuberosum × S. berthaultii, F3) montrant divers degrés de pubescence glandulaire. Les clônes ayant une forte pubescence ont reçu le pourcentage le plus élevé d'oeufs de prédateurs, alors que les clones ayant les densités de trichomes les plus faibles avaient les pourcentages les plus élevés de prédateurs immatures et adultes. Par comparaison, les nombres les plus élevés de momies de parasitoïdes d'aphides (surtout des Aphidius et Praon spp.) ont été observés sur les clones à densité moyenne à élevée de pubescence glandulaire. Les prédateurs et parasitoïdes ont été les plus abondants à la fin juillet et en août.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 10 , October 1985 , pp. 1231 - 1237
Copyright
Copyright © Entomological Society of Canada 1985

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