Anthracnose, caused by the fungus Colletotrichum orbiculare, is a destructive disease of watermelons that reduces
yield and quality of fruit. A field trial was conducted in Cook County to evaluate fungicide efficacy for controlling
anthracnose in watermelons. Treatments included four applications of Bravo Weatherstik followed by Quadris and
Quintec in rotation with either Fontelis + Tebuzol; Edura + Tebuzol; Luna Experience; Bravo Weatherstik; Switch;
Inspire Super; Topsin XTR; Tebuzol; Fontelis + Bravo Weatherstik; or Endura + Bravo Weatherstik. One treatment
consisted of seven applications of Bravo Weatherstik only. An untreated check was included in each replication. Plots
were evaluated for anthracnose 15, 20 and 28 June. The most significant reductions in anthracnose on the 28 June
ratings were observed in treatments containing Bravo Weatherstik 6 SC only. Treatments that included Topsin XTR in
rotation with Quadris and Quintec also reduced anthracnose greater than treatments that included Bravo Weatherstik
in rotation with Quadris and Quintec. Data suggests Bravo Weatherstik as well as Topsin XTR significantly reduced
anthracnose compared to the untreated check, however considering potential for rind burn, Topsin XTR should be
considered in a fungicide spray program to effectively reduce anthracnose while preserving marketable fruit.
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