I noticed what I assumed to be powdery mildew on my Hoya Sunrise x unknown. This plant in particular I grew from seed and is just shy of being a year old. Certain vines on the plant had a white flour-like substance on them. I treated it multiple times with cooper fungicide but didn't notice any difference. I also used leaf shine to wipe off the leaves individually but it didn't seem to help. I saw someone post on one of the national Facebook groups about this issue and it was commented that it might be salt build up on the leaves. The recommendation was a 1:1 ratio of water and alcohol to wipe down the leaves. I tried this as well with no luck solving the problem. My latest attempt has been spraying on sulfur. There are still a few noticeable spots on some of the affected leaves but they don't look quite as powdery as before. Hopefully, another sulfur treatment or two will take care of the issue.
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