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PREBLOOM PETROLEUM OIL APPLICATIONS FOR DELAYING PEAR PSYLLA (HOMOPTERA: PSYLLIDAE) OVIPOSITION1

Published online by Cambridge University Press:  31 May 2012

R. W. Zwick  and
P. H. Westigard
R. W. Zwick
Affiliation:
Oregon State University, Mid-Columbia Experiment Station, Hood River 97031
P. H. Westigard
Affiliation:
Oregon State University, Southern Oregon Experiment Station, Medford 97501
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Abstract

Application of petroleum oils prior to oviposition by overwintering pear psylla, Psylla pyricola Foerster, reduced oviposition by 98% for up to 5 weeks. The delay of oviposition and reduction in subsequent egg and nymph densities were inversely proportional to the rate of oil used. The reduced oviposition rate was due primarily to inhibition of oviposition by oil deposits on the host, not adult mortality. No commercially important deleterious effects of oil treatments were detected on several pear varieties.

Type
Articles
Information
The Canadian Entomologist , Volume 110 , Issue 3 , 01 March 1978 , pp. 225 - 236
Copyright
Copyright © Entomological Society of Canada 1978

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