Evaluation of Fungicides for Control of Apple Scab, 2023

Apple scab, caused by Venturia inaequalis, is one of the most economically significant diseases of apples worldwide. Severe infections can cause extensive defoliation and fruit with multiple lesions, rendering the apples unmarketable for fresh market sales. Commercial producers rely heavily on intensive fungicide spray programs to prevent disease outbreaks in susceptible cultivars. This report evaluates the efficacy of five fungicides for the management of primary scab and fruit scab. The trial was conducted in 2023 on 6-year-old ‘Golden Delicious’ apple trees. Results from these trials can be used to advise apple producers on developing fungicide spray programs for the management of apple scab in Ohio.