Somethings killing blacked eyed susans

when i looked at them today, the tops had black on the leaves, I've had them for five years, and never any problems. i than looked at the base of the plant, and there was foamy looking stuff. it looked like soap foam. can anyone tell me what this is, and how i could possibly get rid of it. i don't want them to die..i will try to get a picture
somethings killing blacked eyed susans, gardening
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