One of my cascade bines is sick, but I don't know what it is is. Hoping a more experienced grower can give me some ideas of what it is & if there is anything I can do about it. The yellow/brown vine gets the most sun, but I am wondering if it is powdery mildew. There is some super-fine cobweb like stuff on the back of the leaf. It is really hard to see - you really have to look for it. Any thoughts?
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