black eyed susan - Knowledgebase Question

framingham, ma
Question by amanda7
September 5, 2007
My black eyed susans start to get a black, dry rot from the bottom up beginning in mid August, and then by the beginning of September, they have all died. Any ideas why? Thank you.

Answer from NGA
September 5, 2007


Unfortunately, Rudbeckia is prone to many diseases. Specifically, Crown and root rot, Botrytis, Anthracnose, Gray Mold and Stem Rot, Mildew, and Rust. Rhizoctonia root rot, sometimes called charcoal rot, sounds like what may have attacked your plants. Remove and discard them now and if you decide to plant new ones next year, plant them in a different spot so you won't have a similar problem.

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