The objective of one experiment conducted in 1998 was to compare two versions of TOM-CAST, a weather-based disease forecasting system, to a weekly spray program for managing early blight in fresh-market tomatoes. Bravo Ultrex alone or in alternation with Quadris were used. All three spray programs were started on 14 July after 37 disease severity values (DSVs) had accumulated from transplanting, which was 5 weeks before the first harvest.