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Populations of whiteflies and incidence of whitefly-borne TYLCV continue to increase in southwest Florida, and with it the dependence on neonicotinoid insecticides to provide the control upon which profitability is so dependent. It is therefore of interest to confirm the activity of these all-important systemic insecticides by periodic testing. Seedlings grown in 128 cell trays were obtained from commercial a greenhouse. Standard protocol is to treat seedlings with 8.25 oz Admire per 10,000 plants applied 7–10 days before shipment but the plants appeared old, many flowering or even fruiting. Seedlings were transplanted 11 Mar at 18-inch spacing on 3 drip irrigated beds, 240 ft long on 6-ft centers. The outer two beds were divided into 8 plots, each 30 ft long and assigned to treatments in a RCB design with four replications. The middle row was left untreated to serve as a source of whiteflies. Admire 2F was applied at 16 and 24 oz per acre and Platinum 2 SC at 8 oz per acre in 100 ml of solution per plant as soil drenches on 12 Mar. Normal cultural practices were followed to control other pest and diseases. Ten weekly evaluations of whitefly adults were made beginning 18 Mar by beating one side of four plants at four locations per plot with a 9 × 13-inch pie pan painted black and coated with a 9:1 mixture of vegetable oil and liquid detergent. Immature stages were monitored for the same 10 period using a single leaf removed from the 6th node of four centrally located plants in each plot. All whitefly stages were counted that appeared in a 2-cm2 ring placed two times on the terminal leaflet from each leaf collected. Plants were evaluated 18 Apr for the presence of severe TYLC symptoms. Fruit was harvested from the same 22 plants per plot on 14 and 21 May where the number and weights of insect, disease and marketable fruit were recorded.

CONTROL OF SILVERLEAF WHITEFLY AND INCIDENCE OF TOMATO YELLOW LEAFCURL VIRUS (TYLCV) ON STAKED TOMATO DRENCHED WITH NEONICOTINOID INSECTICIDE, 2003