Evaluating the Impact of Spray Volume and Pruning on Effectiveness of the Sooty Blotch/flyspeck Warning System

Mark L. Gleason, Iowa State University
Jean C. Batzer, Iowa State University


A sooty blotch flyspeck (SBFS) warning system, developed in North Carolina and modified in Kentucky, extends the period between first-cover and second-cover fungicide sprays until a total of 175 hours of wetness has been measured in the orchard canopy. After the second cover, sprays are made at 2-week intervals until harvest.