#Willow tar spot on #Salix caprea caused by #Rhytisma salicinum (Chaudeyrolles, Monts du #Mezenc, FR).

Stroma of #Rhytisma acerinum, very common on #Acer campestre (tache goudronneuse de l'érable) #Pratclaux, Haute-Loire, France

#Rhytisma acerinum on #maple leaves @AgroParisTech #Grignon: autumn is a second spring when every leaf is a flower for phytopathologists 🍃🍂🍁