Evaluation of organic alternatives for control of brown rot and Rhizopus rot on peach and nectarine, 2008

摘要

Organic alternative and synthetic/conventional spray programs were evaluated for control of brown rot and Rhizopus rots in a mature ‘Loring’ and ‘Redskin’ peach and ‘SunGlo’ nectarine orchard located at a Penn State Fruit Research & Extension Center inArendtsville, PA. Treatments were applied with a boom sprayer (100 gal/A spray volume at 400 psi) on each side of the tree. Two bloom applications (B) were made on 7 and 23 Apr, two postbloom cover applications (PB) on 6 and 25 May, and preharvest (PH) and harvestapplications (H) on 15 Jul (PH for ‘SunGlo’), 5 Aug (H for ‘SunGlo’, PH for ‘Loring’), 15 Aug (H for ‘Loring’, PH for ‘Redskin’), and 2Sep (H for ‘Redskin’). Four replications of each treatment were applied to a randomized complete block design, with each plot consisting of a tree each of ‘Loring’ and ‘Redskin’ peach and ‘SunGlo’ nectarine. Maintenance sprays for insects were applied to all treatments from petal fall through the cover sprays with an airblast sprayer (100 gal/A spray volume at 400 psi). There was no blossom blight observedafter bloom. At maturity, 50 fruit were harvested from each plot for assessments. Fruit were harvested on 5 Aug (‘SunGlo’), 15 Aug (‘Loring’) and 2 Sep (‘Redskin’) and placed on fiber produce trays and incubated in a temperature controlled room at70o F. Brown rot and Rhizopus rot were assessed on ‘SunGlo’ and ‘Loring’ at 4, 7, and 10 days after harvest (DAH) (Tables 1 & 2). Data obtained wereanalyzed by analysis of variance using appropriate transformations and significance between means was determined by the Fisher’sprotected LSD (alpha = 0.05).