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Q.Should Burning Black Knot Fungus Only Be Done In Freezing Temps?

Zone Minneapolis | Anonymous added on May 27, 2022 | Answered

Can I burn black knot fungus infected limbs in warm weather without risking the spread of spores? Also, between burning and burying, is one more effective or otherwise better practice than the other? I live on the edge of a large wooded area, and my burn area is about 25 feet from any trees.

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GKH_Susan
Certified GKH Gardening Expert
Answered on June 6, 2022

It is best to prune black knot fungus when the tree is dormant, so you would be burning the branches in winter. Since you are past winter, you could bury the pruned limbs.

https://www.gardeningknowhow.com/plant-problems/disease/black-knot-tree-disease.htm

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