Mites of Crataegus and Amelanchier in Hood River Valley, Oregon1

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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 rubrioculusScheuten; yellow spider mites, Eotetranychus carpini borealis (Ewing) ; E. willamettei (Mcgregor); and European red mites, Panonychus ulmi (Koch). Four predaceous species, Balaustiumsp., 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.

Document Type: Research Article

Publication date: April 1, 1968

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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