In order to manage Bemisia tabaci populations resident in our greenhouses, we use papaya “banker” plants (Carica papaya) infested with the papaya whitefly, Trialeurodes variabilis and the parasitic wasp, Encarsia transvena. The papaya whitefly will not feed on any of the ornamental plants we currently grow. E. transvena is the best natural enemy of the silverleaf whitefly, Bemisia argentifolii, we have evaluated but this species isn't commercially available. In the greenhouses where we utilized this "banker" plant system, whitefly populations never became an issue. In fact, we didn't treat our poinsettia crop for over 7 months. The immature whitefly density was less than 0.5 whitefly scale per leaf. This banker plant system can be used in conjunction with all other management tools such as Distance® (pyriproxyfen) and Marathon®. Another system is used to increase the number of N. californicus available for release. The grower plants corn and/or sorghum each week. Once the pants reach a height of about 12 inches they are infested with the Banks grass mite, Oligonychus pratensis (Banks). This mite does not feed on the ornamental crops being protected. The grower receives a shipment of N. californicus every other week. These predators are then released, as usual, with some of the shipment being held back to be put on the invested corn plants. These banker plants are then moved into the crop and the predators move off of them in search of spider mites and broad mites in the crop.