I planted tubers for three dahlia types some time ago. This year, I ignored them completely, only to discover that they were covered with white powdery substance. This is at summer's end, which means it stayed like that all summer. I cut down all of the dahlia's leaving only the base of their stems so I can relocate them to dig them up.
I'd like to know, does this powdery mildew affect the tuber itself too? I wanted to relocate the tubers, but I'm worried that if I do, it will relocate/spread the powdery mildew.
Are the tubers supposed to be treated with something? Are they ruined? Please help!
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gardengal48 (PNW Z8/9)