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Spider mites are the most commonly treated arthropod pest of roses grown for sale as plants in Kern County, California. One obstacle to possible reduction of acaricide use has been lack of a quantitative method for field evaluation of mite populations. A presence/absence (P/A) technique for mite sampling was evaluated in 1987-1991. Background data was collected in six fields of first-year and second-year rose plants in 1987 and 1989. A strong correlation existed between numbers of infested leaflets and leaves. P/A counts were similar among strata within first-year and second-year fields. A strong correlation existed between numbers of infested leaflets and leaves. In 1990 and 1991 P/A data was compared to mite counts obtained by brushing in replicated plots using leaves as sampling units. Acaricide applications have been made in the field on the basis of P/A count. Further work is underway to estimate the effects of treatment at several threshold levels of mite infestation as evaluated by P/A.

A NEW SAMPLING TECHNIQUE FOR MANAGEMENT OF SPIDER MITES IN FIELD ROSES