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Observations on the Natural Control of the Pear Psylla, Psylla pyricola Förster, in California

Published online by Cambridge University Press:  31 May 2012

H. F. Madsen ,
P. H. Westigard  and
R. L. Sisson
H. F. Madsen
Affiliation:
University of California, Berkeley
P. H. Westigard
Affiliation:
University of California, Berkeley
R. L. Sisson
Affiliation:
University of California, Berkeley
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Abstract

Studies in 1961 and 1962 showed that several naturally occurring conditions suppress the pear psylla. Temperatures above 100°F. caused mortality of nymphal stages and reduced adult oviposition. Crystallization of honeydew was a mortality factor in a few instances, and seemed to be associated with high temperature and low humidity. Absence of new growth and poor condition of leaves caused a steady decline in pear psylla numbers in abandoned orchards. Anthocoris antevolens White was an effective predator in unsprayed orchards and significantly reduced pear psylla populations. A parasite, Trechnites insidiosus (Crawford) was encountered, but its significance as a mortality agent was not determined.

Type
Articles
Information
The Canadian Entomologist , Volume 95 , Issue 8 , August 1963 , pp. 837 - 844
Copyright
Copyright © Entomological Society of Canada 1963

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