Seasonal Fluctuations in Phytophagous and Predaceous Mite Populations on Stonefruits in California 1

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Abstract
Two varieties of peach, one of nectarine, and one of plum were sampled periodically over a 3-yr period in the San Joaquin Valley of California to determine the relative seasonal densities of the predaceous and phytophagous mites present on the leaves. Predators collected included the phytoseiid Neoseiulus caudiglans (Schuster), Amblyseius hibisci (Chant), Typhloseiopsis citri (Garman and McGregor), Typhlodromus occidentalis Nesbitt, and a stigmaeid, Zetzellia mali (Ewing). Phytophagous mites included Tetranychus urticae Koch, T. pacificus McGregor, and Panonychus ulmin (Koch) (Tetranychidae), and Aculus cornutus (Banks) and Diptacus gigantorhynchus (Nalepa) (Eriophyidae). Relative densities of these species were not constant, but varied irregularly from year to year. Seasonal trends of each species were generally similar on the different tree hosts.

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