Hi;

Thanks for the question concerning your Brunnera with black spots. It most likely is Foliar Nematodes.

 One thing that you will benefit from is to clean up the blackened tissue and remove it from the site to reduce disease occurrence next year. Make sure watering is done
during the daytime hours so foliage dries off before evening hours.

I have listed links that go into detail of this problem and possible treatments. If you should use the pesticide management suggestion make sure the pesticide is safe to use on your plant and Read and Follow the Label Directions! Also listed is your County OSU Extension Service should you want to contact them for additional assistance.

 Thank you again for allowing us to help you with your gardening questions. Here are some other helpful websites that may be of interest to you:

BYGL Newsletter: http://bygl.osu.edu/

OSUE Fact Sheets: http://ohioline.osu.edu

State Master Gardener Volunteer website - http://mastergardener.osu.edu

Ask-An-Expert website - https://extension.osu.edu/ask-an-expert

Ask-A-Master
Gardener website -
https://extension.osu.edu/https%3A/extension.osu.edu/ask-an-expert/ask-master-gardener-volunteer


Wood County OSU Extension Office

639 S Dunbridge Road, Suite 1

Bowling Green, Ohio 43402

Phone:<personal data hidden>

Fax:<personal data hidden>

Link:

Visit the Wood County Office website

https://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/insects-pests-and-problems/diseases/nematodes/foliar-nematodes

https://plantandpest.com/brunnera-jack-frost-problems/

https://forwardgardening.com/common-problems-of-brunnera-jack-frost/

https://www.purduelandscapereport.org/article/foliar-nematodes/