Evaluation of organic alternatives for control of brown rot and Rhizopus rot on peach and nectarine, 2007

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 in Arendtsville, 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 4 and 23 Apr, 2 postbloom cover applications (C) of MicroSulf (6.0 lb/A) to all treatments on 4 and 11 May, and preharvest (PH) and harvest applications (H) on 20 Jul (PH for ‘SunGlo’), 2 Aug (H for ‘SunGlo’, PH for ‘Loring’), 13 Aug (H for ‘Loring’, PH for ‘Redskin’), and 31 Aug (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 observed during bloom. At maturity, 50 fruits were harvested from each plot for assessments. Fruits were harvested on 2 Aug (‘SunGlo’), 13 Aug (‘Loring’) and 31 Aug (‘Redskin’) and placed on fiber produce trays and incubated in a temperature controlled room at 70o F. Brown rot and Rhizopus rot were assessed at 4, 7, and 10 days after harvest (DAH).