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thalictrum downy mildew

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dewberry:
Do thalictrum get aquilegia downy mildew?  My thalictrum delavayi didn't flower very well this year.  I've just noticed there are brown blotches on the stems.

MarcR:
dewberry,

If it is fungal, a full strength vinegar wash might clear it up. If not try Captan or other commercial fungicide.

Jeffnz:
I agree with Marc that a fungal spray is needed but your description does not fit with it being powdery mildew.

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