Abstract
Laboratory studies to determine host-mite preferences were conducted on the predaceous mites Typhlodromus longipilus Nesbitt, T. occidentalis Nesbitt, T. rhenanus (Oudemans), Amblyseius cucumeris (Oudemans), and A. fallacis (Garman), all of which were found commonly in the vicinity of Yakima, Washington. Though mites of other genera could be utilized to some extent, various species of Tetranychidae (especially Tetranychus medanieli McGregor) proved the most suitable hosts for Typhlodromus longipilus and for both species of Amblyseius. A. cucumeris was the only one of these predators that could develop satisfactorily on the European red mite, Panonychus ulmi (Koch), and on the tree form of the clover mite, Bryobia rubrioculus (Scheuten). A. cucumeris was not tested with the apple rust mite, Aculus schlectendali (Nalepa), but this proved an excellent and readily accepted host for the other 4 predators. Indeed, T. rhenanus could not be reared on any host other than A. schlectendali, and T. occidentalis showed strong symptoms of inadequte diet in its absence, though able at least to maintain itself on other hosts. Other rust mites were not available for trial.
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