Abstract
Mites were sampled from the leaves, spurs, and terminal stems of Crataegus douglasii Lindblom, C. columbiana Howell. and Amelanchier alnifolia Nutt, in Hood River Valley. Oregon. Four species of mites known to be phyto-phagous were collected from the wild host and from apple orchards. These are Bryobia rubrioculus Scheuten; yellow spider mites, Eotetranychus carpini borealis (Ewing); E. willamettei (Mcgregor); and European red mites, Panonychus ulmi (Koch). Four predaceous species, Balaustium sp., Typhlodromus anchialus (Kennett). T. arboreus (Chant). and T. rhenanus (Oudemans), found on the wild hosts were also collected from apple orchards. Only B. rubrioculus, P. ulmi, T. rhenanus, and Balaustium sp. were abundant, and then only when adjacent orchards supported large populations. Although their relationships with the host species could not be determined. Tydeus californicus (Banks) was commonest on C. columbiana, while T. zempoalensi Baker seemed to prefer C. douglasii.
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