The predatory mite Amblyseius cucumeris (Oudemans) was studied in the laboratory to evaluate its potential as a biocontrol agent against the spider mite Schizotetranychus nanjingensis Ma & Yuan, a pest of the moso bamboo in Fujian, China. When fed S. nanjingensis females and eggs, the life cycle of A. cucumeris (developmental time from egg to egg 7.7 days for the first generation and 7.8 days for the second generation) was as long as its life cycle on its normal diet in the laboratory, Tyrophagus putrescentiae (Schrank) (7.8 days) at 27-28 o C. Adult females of A. cucumeris started to lay eggs at the age of 3 days with a daily rate of 1-4 eggs (average of 2.2) over a period of 7-18 days and a total fecundity of 35.8 (14-47) eggs. The number of prey consumed by predators increased with prey density and the number of eggs produced was directly correlated with the number of prey consumed. Female predators consumed twice as many female spider mites as did male and deutonymph predators (6 versus 3 per day at 9 prey per leaf). A. cucumeris females were unable to invade intact webnests of S. nanjingensis but were able to invade and liked to stay and lay eggs in broken nests with existing openings or holes.