The invasive ascomycete Hymenoscyphus fraxineus is the causative agent for ash dieback on the European species Fraxinus excelsior and Fraxinus angustifolia, and there is concern that it is going to replace the native, closely related and nonpathogenic Hymenoscyphus albidus . Fungal management in forests is limited, and alternative approaches for control are needed. Within the scope of the project “FraxForFuture”, several strat...