Predation by the western predatory mite (Acari: Phytoseiidae) on the Pacific spider mite (Acari: Tetranychidae) in the presence of road dust
1989
Oi, D.H. | Barnes, M.M.
Laboratory and greenhouse studies examined the effects of road dust on predation by the western predatory mite, Typhlodromus (=Galandromus) occidentalis (Nesbitt), on the Pacific spider mite, Tetranychus pacificus McGregor. Significantly fewer Pacific spider mites were found on bean plants and almond trees with western predatory mites regardless of the presence or absence of dust. A detrimental effect of dust was not evident on populations of western predatory mites. The effect of dust on populations of Pacific spidermites was not conclusive because high and low populations were associated spider mites was presence of dust. In addition to dust and predators, we examined the effect of almond tree water stress on predation. Water stress did not have any significant effects on either population, however the accumulated degree hour difference between stressed and nonstressed trees was low. These studies suggest that road dust does not influence predation by western predatory mites on Pacific spider mites.
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