Control of the Silverleaf Whitefly on Lantana Under Greenhouse Conditions, Fall 1993

Year old Lantana plants were cut back to eight to twelve inch branches and allowed four weeks growth before use. During the growth phase, the plants were exposed to heavy population of silverleaf whitefly within the greenhouse. A 24 hour trapping on six sticky cards (6 × 9 inch) captured 398 whiteflies (mean of 66.3/card). A pre-treatment sample of four fully expanded leaves/plant was taken and was followed by treatment assignments. Treatments were made using a hand sprayer at 30-40 psi. Following treatment, plants were arranged in a randomized block design (5 plants/treatment) on raised greenhouse benches. Samples of four leaves per plant were collected on a weekly basis for three weeks and numbers of SWF eggs, nymphs, and dead/leaf were recorded.