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TYLCV is a devastating whitefly-vectored disease of tomato that has spread from the Mediterranean to the Caribbean region including Florida. Along with cultural control, such as host free periods, insecticidal control of the vector is the key to present-day management of TYLCV. Greenhouse-raised seedlings were planted 9 Mar at 18-inch spacing on two sets of three drip irrigated beds, 240 ft long on 6-ft centers. The outer two beds of each set were divided into seven plots, each 34 ft long, and assigned to treatments in a CRB design with four replications. The middle row of each three-bed set was left untreated to serve as a source of whiteflies. On 16 Mar, two tomato plants that had been exposed to TYLCV infected whiteflies were transplanted in the center of each plot to provide a source of virus inoculum. Admire 2F and Platium 2 SC were applied as soil drenches on 13 Mar in 10 ml water per plant. Two treatments, one with the half rate of Admire and one with no Admire, received weekly applications, 11 in total, of Neemix beginning 1 Mar when the plants were still in the transplant trays. Actara 25 WG was applied as a foliar spray on 21 Mar, 11 Apr, and 2 May. Applaud 70 WP was applied 11 Apr and the same plots sprayed with Knack 0.86 EC on 2 May. Foliar applications were made using a high clearance sprayer driven by a hydraulic pump operating at 200 psi and delivering the spray through two drop booms equipped with two yellow hollow cone ceramic Albuz nozzles each at a rate of 44 gpa until 11 Apr when another nozzle was added to each drop for an output of 66 gpa for the remaining applications. Seven weekly evaluations of whitefly adults were made beginning 10 Apr by beating one side of four plants at four locations per plot with a 9 x 13-inch pie pan painted black and coated with a 9:1 mixture of vegetable oil and liquid detergent. Immature stages were monitored from one 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 four times on each leaflet using three leaflets from each leaf collected. Plants were monitored every 3 or 4 days for symptoms of TYLCV. On 26 May, 15 plants per plot were harvested and the number and weights of insect, disease, and marketable fruit were recorded.

IMPACT OF INSECTICIDES ON SILVERLEAF WHITEFLY AND TOMATO YELLOW LEAFCURL VIRUS (TYLCV) ON STAKED TOMATO, 2000