Evaluation of host resistance coupled with an organic fungicide program for the management of bacterial speck on tomato, Portland, NY 2018

摘要

Organic fungicide programs and three cultivars of tomato (Iron Lady, Mt. Magic, and Sunrise Bumblebee) were evaluated at the Cornell Lake Erie Research and Extension Laboratory (CLEREL), Portland, NY on a Chenango gravelly loam soil. The field site was previously planted to cucumbers in 2017. A spit plot design was used with three replications and treatments arranged in a randomized complete block design. Organic fungicide programs were the main plot and consisted of one 4-ft wide by 22.5-ft long raised bed subdivided into 7.5-ft subplots for each of the cultivars. Each subplot consisted of five tomato plants with 18-in. spacing transplanted on 7 Jun. Drip irrigation was applied as needed. All fungicides were applied with a CO2 backpack sprayer at 35 gal/A and 20 psi using four TeeJet 8005 flat fan nozzles spaced 16-in. apart. Bacterial speck was first detected on 9 Aug. Bacterial speck was rated based on the percent of plant tissue showing symptoms on a 0 to 100% scale, and tomatoes were harvestedand their yield and quality assessed weekly per subplot.