Four years after the initial outbreak, a teleomorph was found in south-east France which Arnaud and Fox identified as an American species, Microsphaera quercina (now included in Microsphaera alni).
Catro anos logo do brote inicial atopouse un teleomorfo no sueste de Francia que Arnaud e Fox identificaron coma a especie americana, Microsphaera quercina (hoxe coñecida coma Microsphaera alni).