Apple and spirea aphids (Homoptera:Aphididae) on apples in south central Washington
Abstract
Aphids were collected from 75 different apple orchards in south central Washington during 1994 and 1995. In 1994, 88% of those examined were spirea aphid (Aphis spiraecola Patch). In 20 orchards we found only spirea aphids; in 11, most were spirea aphids and in 2, all were apple aphids (A. pomi deGeer). In 1995, 76% of those examined were spirea aphids. In 13 orchards we found only spirea aphids; in 22, most aphids were spirea; in one, all, and in 6 most, were apple aphids. In the two years combined, 33 orchards (44%) had only spirea aphids, 33 (44%) had predominantly spirea aphids, 6 (8%) had mainly apple aphids and 3 (4%) had only apple aphids. There were no clear differences in distribution of the two species over time or on different apple cultivars.
Key words: Aphid; Spirea; apple; orchard
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