Scottish Rock Garden Club Forum

Seedy Subjects! => Seed Exchange => Topic started by: dewberry on September 12, 2023, 09:52:01 AM

Title: thalictrum downy mildew
Post by: dewberry on September 12, 2023, 09:52:01 AM

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.

Title: Re: thalictrum downy mildew
Post by: MarcR on September 12, 2023, 05:02:24 PM

dewberry,

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

Title: Re: thalictrum downy mildew
Post by: Jeffnz on September 12, 2023, 09:33:27 PM

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