Cover Crop Manipulation for Building Pear Psylla (Homoptera: Psyllidae) Predator Populations in Pear Orchards

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Abstract
Cover crops in pear orchards in the Yakima Valley in Washington harbored a large complex of general predators. The most common species were Nabis spp. and Coccinella transversoguttata richardsoni Brown. The major predators of the pear psylla, Psylla pyricola Foerster, Amthocoris spp. and Deraeocoris spp., were infrequent in cover crops. Plantings of small grains as cover crops were sporadically successful in retaining major pear psylla predators by supplying alternate prey, mainly the green bug, Schizaphis graminum (Rondani).

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