Abstract
The effect of releases of Amblyseius californicus (McGregor), Phytoseiulus persimilis Athias-Henriot, and Typhlodromus occidentalis Nesbitt on the twospotted spider mite, Tetranychus urticae Koch, on strawberry was investigated in southern California in 1972–73. The spider mite populations were significantly reduced in the P. persimilis, A. Californicus , and T. occidentalis release plots. The mean numbers of spider mites in each release plot and in the check were significantly different from each other on each survey date except June 6 when the mean numbers in the release plots were significantly different from the check, but not from each other. The mean fruit yield (g/plant) also was significantly different in all plots. P. persimilis was the most efficient of the 3 predators in suppressing T. urticae populations.
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