The objective of this study was to evaluate the effects of some selected acaricides recommended for the
control of the two-spotted spider mites; chlorfenbyer (Challenger® 36% SC), hexythiazox (Maccomite® 5% WP) and
pyridaben (Pyromate® 20% WP) on development and life table parameters of Phytoseiulus macropilis (Banks) as an
important natural enemy of this pest mite under laboratory conditions. Life cycle duration averaged 8.44, 8.20 and 9.45
days for chlorfenbyer, hexythiazoxand and pyridaben, respectively compared to 5.49 days in the control. The tested
acaricides caused a significant reduction in the female longevity and fertility of the predatory mite. The intrinsic rate of
increase (rm) and finite rate of increase (λ) values were significantly lower than those in the control. Mean generation
time (T) was 13.32, 14.96 and 13.88 with chlorfenbyer, hexythiazox and pyridaben, respectively, and significantly
lower than the control (11.91 days). Pyridaben reduced fertility by 68.64% relative to the untreated control.