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.
Iowa State University
Gleason, Mark L. and Batzer, Jean C., "Evaluating the Impact of Spray Volume and Pruning on Effectiveness of the Sooty Blotch/flyspeck Warning System" (2010). Iowa State Research Farm Progress Reports. 333.