Abstract
The use of persistent OP insecticides made mite management practical in orchards since the predator, Neoseiulus fallacis (Garman), quickly becomes resistant to these chemicals. In developing a mite-management program, the effect of pesticides was investigated by full season plots, population samples of small, replicated pesticide plots, and at close intervals after single applications of pesticides to replicated plots. Many population samples from commercial orchards were studied in order to adapt management practices to the biology of the mites. Most fungicides have no effect on mites, but several suppress phytophagous mites while having little or no effect on N. fallacis. Applications of miticides at reduced dosage to low levels of phytophagous mites are more effective than a single full dosage on medium or high population levels in suppressing pest mites until predators can increase sufficiently to effect control. Several miticides kill phytophagous mites but are harmless to N. fallacis. An early application of plant spray oil plus a properly timed application of miticide 3–5 weeks after bloom comprise the main features of managing the mite populations. In about 25% of the orchards observed no miticide was required.
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