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SEASONAL ABUNDANCE OF THE MULLEIN BUG, CAMPYLOMMA VERBASCI (MEYER) (HETEROPTERA: MIRIDAE), ON APPLE AND MULLEIN IN THE OKANAGAN VALLEY

Published online by Cambridge University Press:  31 May 2012

H.M.A. Thistlewood ,
J.H. Borden  and
R.D. McMullen
H.M.A. Thistlewood
Affiliation:
Centre for Pest Management, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
J.H. Borden
Affiliation:
Centre for Pest Management, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
R.D. McMullen
Affiliation:
Centre for Pest Management, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
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Abstract

The mullein bug, Campylomma verbasci (Meyer) (Heteroptera: Miridae), was studied in and around 17 apple orchards in the Okanagan Valley during 1982–1984. Apple and pear were overwintering hosts and the principal perennial hosts during summer months. Campylomma verbasci was the most abundant mirid on apple and occurred in 16 orchards, with two or three generations per year. Nymphs first emerged from overwintered eggs near full bloom, but variation in timing occurred between orchards and years. Population densities of C. verbasci were higher (P<0.05) in unsprayed than in sprayed orchards, but no differences were observed between commercial and “organic” orchards. In June, some adults moved onto herbaceous plant hosts, primarily common mullein, Verbascum thapsus L. Two generations of C. verbasci were found on mullein and the bugs were distributed in an aggregated pattern. Significant associations occurred among height, raceme length, or flower number of mullein plants and the number of C. verbasci on them. From mid-August to October, adult numbers declined on mullein and increased on apple. The number of mullein plants per orchard was not always associated with the density of overwintered C. verbasci in the following year.

Résumé

La punaise de la molène, Campylomma verbasci (Meyer) (Heteroptera : Miridae), a été étudiée en dedans et autour de 17 vergers de pommes de la vallée de l’Okanagan pendant 1982 à 1984. Les hôtes hivernants étaient les pommiers et les poiriers et ils étaient aussi les hôtes perpétuels les plus importants pendant l’été. Campylomma verbasci a été la punaise la plus abondante de la pomme et elle s’est rencontrée dans 16 vergers, ayant deux à trois générations par année. Les nymphes se sont écloses d’oeufs hivernants quand les arbres étaient près de la floraison complète, mais le temps d’apparence a varié parmi les vergers et les années. La densité de population de C. verbasci a été élevée (P<0,05) dans les vergers non-arrosés à comparer à ceux arrosés, mais aucune différence n’a été observée entre les vergers commerciaux et les vergers “organiques”. Au mois de juin, quelques adultes ont déménagé aux plantes-hôtes herbacées, principalement à la molène, Verbascum thapsus L. Deux générations de C. verbasci étaient trouvées sur la molène et les punaises ont été distribuées dans un patron collectif. Des associations significatives sont survenu entre la grandeur, la longueur de raceme, ou le nombre de fleurs des plantes de molène et le nombre de C. verbasci. À partir de la mi-août au mois d’octobre, le nombre d’adultes a diminué à la molène et augmenté à la pomme. Le nombre de plantes de molène par verger n’a pas toujours été associé avec la densité l’année suivante de C. verbasci qui a survécu l’hiver.

Type
Research Article
Information
The Canadian Entomologist , Volume 122 , Issue 6 , December 1990 , pp. 1045 - 1058
Copyright
Copyright © Entomological Society of Canada 1990

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Footnotes

1

Current address: Agriculture Canada Research Station, Vineland Station, Ontario, Canada L0R 2E0.

2

Agriculture Canada Research Station, Summerland, British Columbia, Canada V0H 1Z0.

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