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Releases of Insectary-Reared Galendromus occidentalis (Acari: Phytoseiidae) in Commercial Apple Orchards

Permanent URL:
http://handle.nal.usda.gov/10113/58291
File:
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Abstract:
Galendromus occidentalis (Nesbitt) is one of several phytoseiid species that are available for purchase to supplement endemic predator populations that are not providing sufficient control of spider mites. We performed a series of releases of commercially reared G. occidentalis in commercial apple (Malus domestica Borkhausen) orchards in Washington from 2010 to 2012. Releases of up to 50,000 mites per acre did not lead to an increase in populations of predatory mites or to a decrease in populations of pest mites. Assessments of mite numbers in shipments and quality (survival and fecundity) of those mites indicated that the commercial insectary was correctly estimating the number of predatory mites in their shipments, and that predator quality was not different than a laboratory colony. Finally, a predator-prey model that used the intrinsic rates of increase of tetranychid prey and the prey consumption rate of the predator indicated that the density of G. occidentalis required to control the prey at the action threshold was not economically feasible. We conclude that G. occidentalis cannot be used to bring about short-term control via inundative releases in crops such as apple with large canopy volumes. KEYWORDS Phytoseiidae, Galendromus occidentalis, Tetranychidae, biological control, inundative release
Author(s):
Rebecca A. Schmidt , Elizabeth H. Beers , Thomas R. Unruh , David R. Horton
Note:
USDA Scientist Submission
Source:
Journal of economic entomology 2013 10 v.106 no.5
Language:
English
Publisher:
Entomological Society of America
Year:
2013
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.