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Seasonal phenology and abundance of Leucopis argenticollis, Leucopis piniperda (Diptera: Chamaemyiidae), Laricobius nigrinus (Coleoptera: Deridontidae) and Adelges tsugae (Hemiptera: Adelgidae) in the Pacific Northwest USA

Published online by Cambridge University Press:  18 April 2016

G.R. Kohler ,
K.F. Wallin  and
D.W. Ross
G.R. Kohler
Affiliation:
Department of Forest Science, Oregon State University, Corvallis, OR 97331, USA
K.F. Wallin
Affiliation:
Department of Forest Science, Oregon State University, Corvallis, OR 97331, USA
D.W. Ross*
Affiliation:
Department of Forest Science, Oregon State University, Corvallis, OR 97331, USA
*
*Author for correspondence Tel: +1 541-737-6566 Fax: +1 541-737-5814 E-mail: [email protected]
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Abstract

Adelges tsugae infested western hemlock trees were sampled periodically for 1 year at two locations in Oregon and Washington to compare the phenology and abundance of three associated predators (Leucopis argenticollis, Leucopis piniperda, and Laricobius nigrinus) and their host. On each sample date, two 3–10 cm long terminal twigs were collected from each tree and brought to the laboratory to count all life stages of A. tsugae and the three predators. Peak larval abundance of Leucopis spp. and La. nigrinus coincided with the presence of A. tsugae adults and eggs. Leucopis spp. larvae were present for a much longer period of time than were La. nigrinus larvae. Furthermore, Leucopis spp. larvae were present during both the progrediens and sistens egg stages, while La. nigrinus larvae were only present during the progrediens egg stage. Overall, we collected 2.3–3.5 times more Leucopis spp. of all life stages than La. nigrinus. These results support the continued study of Leucopis spp. from the Pacific Northwest as biological control agents for A. tsugae in the Eastern USA.

Keywords

hemlock woolly adelgidsilver fliesbiological control
Type
Research Papers
Information
Bulletin of Entomological Research , Volume 106 , Issue 4 , August 2016 , pp. 546 - 550
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Copyright
Copyright © Cambridge University Press 2016 

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