Three natural enemies, the mite A. swirskit, the beetle D. catali- me, and the parasitoid formosa, were tested and were applied to the poinsettias in the cages as follows, For A. swirskii, ca. 10 adults were transferred by use of fine paintbrush to each of five poinset tia leaf-discs(3 cm diameter) that were cut from 2-3 month old poinsettias. The five leaf-discs with predators were placed on the e upper leaves of each poinsettia For D. catalinae, three adults were transferred using a paintbrush to each of five poinsettia leaf discs ich were then placed on the five upper leaves or each poinsettia. For E. formosa, 60 adults were aspirated into a 25 ml glass vial and released from the bottom of each poinsettia ceived no natural enemies To provide an equal handling distur bance while introducing the natural enemies on the poinsettia either one sham via or five sham eaf-discs with no natural ene- e placed in similar location across the treatments The mies numbers of adult whiteflies on the underside of the leaves of each plant were counted every 24 h for 3 days The of D. linae and E. formosa were counted simultaneously with whiteflies and if the natural enemies were found on the cucumber they were removed from the plant The number of A. swirskii was recorded under a microscope a the 3-day observation The experiment was carried out at 20-25 eC and a L14:D10 photoperiod in a re- search greenhouse. The test was replicated 5 times ANOVA. The The data were analyzed using repeated measures response variable was the proportion of whiteflies on the cucum ber, relative to total number of whiteflies on the plants in each cager Tine response variable was arcsine-transformed to normalize the data and equalize variances.