What is this black growth?

Asked November 21, 2019, 6:53 PM EST

Just wanting to know what this black growth could be on our tree? Couldn’t find anything that seemed to fit the description just right. Thank you for you help!

Brown County Minnesota

2 Responses

Your tree appears to be affected by a fungus called black knot. I will include a link below to the U of MN extension article on black knot. Most trees can tolerate the fungus, but it's best to remove the affected branches by pruning in February or March when the temperatures are well below freezing and the tree is dormant.

More about black knot: https://extension.umn.edu/plant-diseases/black-knot
How to remove affected branches: https://extension.umn.edu/plant-diseases/black-knot#pruning-out-galls-1170311

Thank you so much for your help! We really appreciate it!