Thinking this issue is fungus. Shall I try to cut off segment of trunk and use fungicide? If so, which one works best? Thank you!
What Fungicide to Buy for Wisteria
Certified GKH Gardening Expert
It is difficult to prescribe a treatment given that I do not know more about the issue your wisteria is experiencing. Can you describe the overall condition of your wisteria - can you tell me more about this fungus or provide a photo? Do your blooms and leaves look healthy? Even if a fungicide was necessary, it would not require cutting the trunk.
Here is an article on common wisteria diseases, including fungal leaf disease, that may help you: