For 3 yr (1989–1991) we examined effects of different integrated pest management (IPM) programs on populations of mites in an apple orchard in Nova Scotia, Canada. The stage 1 IPM program involved pest monitoring and application of insecticides (phosmet, pirimicarb, Bacillus thuringiensis var. kurstaki Berliner + one-tenth the recommended rate of cypermethrin) known to be harmless or slightly harmful to the phytoseiid predator Typhlodmmus pyri Scheuten. With the stage 2 program, most insecticide applications were replaced by alternatives such as insecticidal soap, insect pathogens, and insect growth regulators. In stage 1 and stage 2 plots, apple scab, Venturia inaequalis (Cke.) Wint., was controlled either with captan, a fungicide that is harmless to phytophagous mites and T. pyri , or with metiram, a fungicide that is slightly harmful to phytophagous mites and moderately harmful to T. pyri . In June and July 1989, densities of European red mite, Panonychus ulmi (Koch), and apple rust mite, Aculus schlechtendali (Nalepa), were too high (maximum 7.6 to > 100 per leaf) to be controlled by the low numbers of T. pyri (<0.1 per leaf) present in the orchard. An early August application of the miticide propargite in stage 1 plots or hexythiazox in stage 2 plots caused populations of P ulmi and A. schlechtendali to decline to 0 per leaf without reducing T. pyri populations. In 1990 and 1991, mite counts in stage 2 plots did not differ with fungicide regime. In stage 1 plots, however, counts of P. ulmi and A. schlechtendali were higher and counts of T. pyri , but not the stigmaeid predator Zetzellia mali (Ewing), were lower with metiram than with captan. Biological control was effective in stage 2 plots and all captan plots: maximum counts of P. ulmi and A. schlechtendali were < 1.5 per leaf and 6 per leaf, respectively. Maxima were higher, but still subeconomic, in the stage 1 metiram plots: 5 per leaf for P. ulmi and 9 per leaf for A. schlechtendali . Additive toxic effects of insecticides and fungicides on T. pyri , the possible contribution of Z. mali to biological control despite competition with T. pyri , and recommendations for integrated mite control are discussed.