Evaluation of fungicides for control of late blight on tomato, Cleveland 2014

摘要

The experiment was conducted at the Piedmont Research Station in Cleveland, NC (N35°42.065'; W080°37.267'). Plots were single beds on 5-ft centers, covered with black plastic mulch; 6-ft long with 4-ft fallow borders at each end. The previous year the field was planted with soybean followed by rye as a cover crop. Tomatoes were transplanted in the field on 31 Jul (6 plants/plot). Irrigation and fertilization were applied via drip tape. Treatments were randomized into four complete blocks. Fungicidetreatments were applied using a CO2-pressurized backpack sprayer equipped with a single-nozzle handheld boom with hollow cone nozzles (TXVS-26) delivering 40 gal/A at 45 psi. Applications were made on 11, 20, 27 Aug and 3, 10, 19 and 24 Sep and 2, 9, 15and 21 Oct. Disease severity was assessed on 9, 16, 22 and 29 Oct as percentage of foliage with necrosis. Data was analyzed in the software ARM (Gylling Data Management, Brookings, SD) using analysis of variance (AOV) and the Waller-Duncan test to separate means.