Vegetable Leafminer Control on Tomato, 1977-78

Two experiments were conducted on Manatee County, FL, commercial fields of ‘Walter’ tomato beginning about 3 wk before the first harvest. Plots were seep irrigated and grown .6 (Expt. 1) or .8 m (Expt. 2) apart on black polyethylene plastic mulched sand beds (0.8 m wide by 0.2 m high) 1.8 m apart. Plots were single rows consisting of 5 (Expt. 1) or 10 (Expt. 2) plants. Treatments were applied to runoff with a hand-held 7.6 liter sprayer at 2.8 kg/cm2 pressure. Four replications were arranged in randomized complete blocks designs. Treatments were applied Oct 31, Nov 7, 14, and 21‘77 for Expt. 1 and Apr 28, May 5, 12, 19, and 26‘78 for Expt. 2. The number of mines were counted on the first trifoliate (terminal 3 leaflets) from the fourth fully expanded leaf from the top of 10 stems on Nov 28‘77 for Expt. 1 and Jun 1 ‘78 for Expt. 2