Curative effects of fungicides against Venturia inaequalis causing apple scab

To control apple scab caused by Venturia inaequalis, fungicides inhibiting the growth of fungal pathogens during the initial stages of infection are important management tools. From 2019 to 2021, bioassays to evaluate the curative effects of fungicides typically used to control apple scab revealed that iminoctadine triacetate, inpyrfluxam, pydiflumetofen, ipflufenoquin, fluopyram, fluxapyroxad, and cyprodinil exerted curative effects against V. inaequalis. Overall, iminoctadine triacetate, inpyrfluxam, and pydiflumetofen were particularly effective. Control of primary infection is important for the management of scab. Therefore, these curative fungicides should be applied during the period from half-inch green to fruit set.