Our wisteria has a white powdery residue on the vine. I originally thought it to be a mildew but the leaves do not appear to be infected. Please advise. what is the diagnosis and what can I do to treat my white wisteria? Thank you.
Certified GKH Gardening Expert
t sounds like you may still have powdery mildew. Neem oil can help. Here is more informaiton: