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Polyphenolic extracts from hop roots and stems display antifungal activity against V. nonalfalfae. Using a nonlinear regression model, the relative average colony diameter (in % of solvent control) was analyzed depending on the logarithmic phenolic extract concentration. Rec, mild pathotype of V. nonalfalfae; T2, lethal pathotype of V. nonalfalfae; Celeia, VW susceptible hop; Wye Target, VW resistant hop.
