Powdery #mildew of field #maple (#Acer campestre) caused by #Sawadaea bicornis (syn. #Erysiphe aceris), with cleistothecia presenting forked appendages and releasing asci (Beynes, FR).
Powdery #mildew of field #maple (#Acer campestre) caused by #Sawadaea bicornis (syn. #Erysiphe aceris), with cleistothecia presenting forked appendages and releasing asci (Beynes, FR).