Efficacy of fungicides for control of brown rot of peach in middle Georgia, 2011.

摘要

Fungicides were evaluated for control of brown rot in an experimental block of a mid-ripening peach variety located at the USDA Fruit and Nut Research Center (Byron, GA). Chemicals were applied with an airblast sprayer (67 gal/A spray volume) on 14 and 21 Jun (pre-harvest sprays). Treatments included an untreated control, Pristine (boscalid + pyraclostrobin) as the chemical standard, Propimax (propiconazole) as a second standard, Inspire Super (difenoconazole + cyprodinil), Inspire XT (propiconazole+ difenoconazole), Quadris Top (azoxystrobin + difenoconazole), and Luna Sensation (fluopyram + trifloxystrobin). Five replications of each treatment were applied to a randomized complete block design, with each plot consisting of four trees; the outer two trees in each plot were not utilized for ratings. Unsprayed rows were left between each spray row. All cultural practices were in keeping with peach production methods commonly observed throughout the Southeast. Earlier in the season, maintenance sprays for scab (Bravo WeatherStik 6F at 4 pt/A at shuck split and Yellow Jacket Sulfur 90WP at 9 lb/A through all cover sprays) were applied to all treatments, including the untreated control. At full maturity, 39 asymptomatic fruit were harvested from eachplot for rot assessments (5 Jul). Fruit were placed on plastic produce trays and stored at ambient room temperature (air-conditioned room; -77 F). Rot incidence was recorded at three, seven, and ten days after harvest (DAH).