Observations on the Natural Control of the Pear Psylla, Psylla pyricola Förster, in California
- 1 August 1963
- journal article
- Published by Cambridge University Press (CUP) in The Canadian Entomologist
- Vol. 95 (8) , 837-844
- https://doi.org/10.4039/ent95837-8
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.Keywords
This publication has 5 references indexed in Scilit:
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