Pollens from various field-grown legumes, including clovers, vetches, pea, and bell bean plants, were fed to laboratory colonies of the predacious mite Euseius tularensis (Congdon). The survival, sex ratio, and reproduction of E. tularensis were compared with those for colonies fed pollen from ice plant, Malephora crocea (Jacquin). Predacious mites fed a diet of pollen from bell bean, Vicia faba L.; ‘Austrian winter’ pea, Pisum sativum (L.) var. ‘arvense’ Poir.; and New Zealand white clover, Trifolium repens L. survived and reproduced as well as those fed ice plant pollen. Predacious mites fed common vetch, Vicia sativa L.; woollypod vetch, Vicia villosa Roth ssp. dasycarpa Ten. var. ‘Lana’; and crimson clover Trifolium incarnatum L. var. ‘Flame’ pollens exhibited reduced fecundity. E. tularensis did not survive more than one generation when fed pollens from rose clover, Trifolium hirtum Allioni var. ‘Hykon’ or red clover, Trifolium pratense L. var. ‘Kingsland’. When E. tularensis was released into a field-grown cover crop mixture of woollypod vetch, bell bean, and ‘Austrian winter’ pea, the predacious mite population exhibited a significantly greater population increase on the cover crop over a 4-week period than in nonrelease areas. Addition of ice plant pollen did not significantly improve population growth of E. tularensis on the cover crop. The majority of the E. tularensis population was recovered from the bell bean plants in the cover crop mixture. When E. tularensis-infested cover crop was cut and placed in young citrus trees that had low natural densities of predacious mites, densities on trees were significantly increased.