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Reduced Growth Associated with Infestations of Douglas-fir Seedlings by Cinara Species (Homoptera: Aphidae)

Published online by Cambridge University Press:  31 May 2012

Norman E. Johnson
Norman E. Johnson
Affiliation:
Forest Entomologist, Forestry Research Center, Weyerhaeuser Company, Centralia, Washington
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Abstract

Aphids of the genus Cinara are capable of causing serious growth reduction of Douglas-fir seedlings. Growth of infested seedlings may be only one-fourth to one-half that of uninfested seedlings. The aphids are easily controlled by injecting demeton around the base of the seedling. The presence of ants to clean up excessive honeydew is shown to be beneficial for the aphids.

Type
Articles
Information
The Canadian Entomologist , Volume 97 , Issue 2 , February 1965 , pp. 113 - 119
Copyright
Copyright © Entomological Society of Canada 1965

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