Treatment Of Wisteria Fungus

Question

This is the second year of flowering for a wisteria. The leaves are healthy and vigorous and the flower racemes form but as they grow, they turn grey and the individual flowers fall off before opening. I have another wisteria within 50 feet that is vigorous and unblemished.

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Answer 1

It may be powdery mildew, which is common on wisteria. Your other wisteria may get more sun so is less susceptible. Here is more:

https://www.rhs.org.uk/plants/wisteria/frequently-asked-questions

https://www.rhs.org.uk/disease/powdery-mildews

https://plantdiseasehandbook.tamu.edu/landscaping/shrubs/wisteria/

https://ipm.ucanr.edu/PMG/GARDEN/PLANTS/wisteria.html