Evaluation of Chlorothalonil, Fenarimol, and Flusilazole for Control of Eastern Filbert Blight

In a greenhouse experiment, treatment of 3-wk-old hazelnut (Corylus avellana) seedlings with suspensions of chlorothalonil (1.8 g a.i./L), fenarimol (0.038 g a.i./L), or flusilazole (0.030 g a.i./L) prior to inoculation with ascospores of Anisogramma anomala resulted in 4, 5, and 7% incidence of eastern filbert blight, respectively, compared to 53% in the inoculated control. In field experiments, exposure of 1- or 2-yr-old potted trees to natural releases of A. anomala ascospores demonstrated that hazelnut is susceptible to infection after vegetative budbreak, and that one to five applications of chlorothalonil, fenarimol, or flusilazole onto vegetative tissues that develop after budbreak significantly (P≤0.05) reduced disease development