Insecticide applications using Danitol 2.4 EC tank mixed with Orthene 90S reduced the numbers of silverleaf whitefly adults, eggs, and nymphs to levels significantly (P<0.05) below the levels found in non-treated cotton among all varieties. There were no significant variety by insecticide treatment interactions for silverleaf whitefly infestation levels, levels of parasitism, or for seed cotton yield. Several of the Australian varieties had silverleaf whitefly infestation levels for adults, eggs and nymphs that were lower than any of the US varieties. The Australian varieties Siokra L23 and 87031-126 consistently had lower whitefly infestation levels than other variety entries and also had higher percent parasitism levels than the other varieties.