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Parasitoids (Hymenoptera: Braconidae: Aphidiinae) of rabbitbrush aphids and linkage with agriculturally important pest aphids in Washington State, United States of America

Published online by Cambridge University Press:  06 August 2012

Abstract

Rabbitbrush, Chrysothamnus Nuttall spp. (Asteraceae), is a common perennial native shrub across the inland western United States. In the Columbia Basin growing district of Washington State, rabbitbrush is often found in close proximity to potatoes and other agronomic crops, but its value as a conservation reservoir and source of parasitoids of merit in agriculture is unknown. Here, we define the aphid parasitoids frequenting rabbitbrush, their aphid host preferences, seasonal occurrence, and linkage or association with other aphids of economic and noneconomic importance. Extensive field collections, lab-holdings, and rearings were used to explore and characterise the fauna. One new species of aphidiine parasitoid is described and illustrated: Praon cowiche Hollingbery and Pike, new species and a key to the parasitoids of rabbitbrush aphids is provided.

Résumé

Les bigelovies, Chrysothamnus Nuttall spp. (Asteraceae), sont des arbustes vivaces indigènes communs dans toute la région intérieure de l'ouest des États-Unis. Dans la zone de croissance du bassin du Columbia de l’état de Washington, la bigelovie se retrouve souvent en étroite proximité des pommes de terre et d'autres cultures agronomiques sans qu'on connaisse sa valeur comme réservoir de conservation et de source de parasitoïdes d'intérêt agricole. Nous déterminons ici les parasitoïdes des pucerons vivant sur la bigelovie, leurs préférences de pucerons hôtes, leur répartition saisonnière et leurs liens ou associations avec d'autres pucerons avec ou sans importance économique. Des récoltes importantes sur le terrain, des maintiens en laboratoire et des élevages nous ont servi à explorer et caractériser la faune. Nous décrivons et illustrons une nouvelle espèce d'aphidiiné parasitoïde, Praon cowiche Hollingbery et Pike, nouvelle espèce, et nous dressons une clé d'identification des parasitoïdes des pucerons de la bigelovie.

Type
Original Article
Copyright
Copyright © Entomological Society of Canada 2012

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