The Brown/Sutton/Hartman 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 second cover, sprays are made at two-week intervals until harvest.
Iowa State University
Sisson, Adam; Gleason, Mark L.; and Batzer, Jean C., "Evaluating Effectiveness of a Sooty Blotch and Flyspeck Warning System at Three Commercial Orchards in Central Iowa" (2009). Iowa State Research Farm Progress Reports. 497.