The two predatory mites , Neoseiulus (Amblyselus) calilornycus (McGregor) and Phytoseiulus macropilis (Banks) were mass reared in the laboratory on mulberry leaf arenas infested with the two-spotted spider mite as animal diet and pollen as plant diet. Both predators were successfully maintained and mass reared on the two-spotted spider mites . The rate of increase of IV.calilanicus on the two-spotted spider mite were &I, 12.0 and 23.5 fold after 6 ,12 and 15 days, respectively . While that of P. maavpilis they were 17.9 ,33.6 and 53.1 fold . Pollen of apricot , palm , peach and apple were unsuitable for rearing the predatory mite , P. macropilis , but proved to be suitable for the predatory mite , N. califomy4us However, the rate of the predator increase were comparatively low when compared with rearing on the two-spotted spider mite ,Tetranychus urficae Koch . They were 1.2 , 3.6 , 1.5 and 1.8 fold after 15 days when reared on pollen of apricot , palm , peach and apple , respectively .