Evaluation of fungicides for control of anthracnose and gummy stem blight of watermelon, Sampson County 2014

摘要

The experiment was conducted in a commercial watermelon field near Clinton, NC (N34°54.654'; W078° 16.119'). Plants were transplanted on 15 May with 'Distinction' seedless and 'Sentinel' seeded melons at a 3:1 ratio. No irrigation was used. Treatments were randomized into four complete blocks. Plots were bare ground double rows on 14-ft centers, 25-ft long with 10-ft fallow borders at each end (17 plants/plot). The previous year the field was planted with tobacco. Fungicide treatments were appliedusing a CO2-pressurized backpack sprayer equipped with a 3-nozzle (19-in. spacing) handheld boom with hollow cone nozzles (TXVS-26) delivering 40 gal/A at 45 psi. The first two applications were made with one pass per plot and the remaining four with twopasses per plot. Applications were made on 26 Jun and 3, 9, 18, 23 and 29 Jul. Disease severity was assessed on 29 Jul and 8 Aug as percent leaf area with necrosis caused by each pathogen. 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.