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bacterial endosymbionts of the psyllid cacopsylla pyricola (hemiptera: psyllidae) in the pacific northwestern united states.insects often have facultative associations with bacterial endosymbionts, which can alter the insects' susceptibility to parasitism, pathogens, plant defenses, and certain classes of insecticides. we collected pear psylla, cacopsylla pyricola (förster) (hemiptera: psyllidae), from pear orchards in washington and oregon, and surveyed them for the presence of bacterial endosymbionts. adult psyllids were collected on multiple dates to allow us to assay specimens of both the summer ("summerform") an ...201728334388
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