Wisteria

Question

Our well established Wisteria’s older branches have developed grey dust like spotty fungus – no leaves, flower heads have formed but have dried out. On younger branches both leaf and flowers are looking very healthy. No signs of gall.

Answer 1

It sounds like you may have powdery mildew. This article will help you: https://www.gardeningknowhow.com/plant-problems/disease/get-the-cure-for-powdery-mildew.htm