Whiteflies are significant pests of ornamental horticulture crops. Three whiteflies species and biotypes contribute to crop production losses in the United States: greenhouse whitefly (Trialeurodes vaporariorum), silverleaf whitefly B biotype (Bemisia tabaci B Biotype), and silverleaf whitefly Q biotype (Bemisia tabaci Q Biotype). >From 2002 through 2013, 87 products or rotational/tank mix treatments comprised of 49 different active ingredients were tested through this screening program. In addition to research collected through the IR-4 program, this summary includes a review of experiments conducted from 2004 to 2013 on ornamental horticulture crops. The best products for Q biotype eradication, and those that should be reserved for critical situations, were Judo and Safari. However, Avid, Sanmite, and TriStar also demonstrated effective control and should be utilized routinely as part of the overall management program for Bemisia whiteflies. Mycoinsecticides under these testing conditions did not perform as well as anticipated for Q biotype whitefly management. Several new products that are included in the IR-4 Whitefly efficacy project looked promising based on their efficacy relative to standards. These include A20520A, GF-2626, GF-2860 and NNI-0101. Further research is needed to obtain additional efficacy data to recommend actions to register or amend labels for these pests. Studies on resistance development indicated potential for Q biotype resistance under intense insecticide pressure.
