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Old 05-23-2019, 07:18 AM
 
Location: Cary NC
1,054 posts, read 1,488,698 times
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My plum tree has what I think is black knot disease, on the limbs and trunk there is black sappy looking stuff.
The tree looks unhealthy.

Anyone have experience with this?
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Old 05-23-2019, 01:44 PM
 
Location: The Woods
17,199 posts, read 22,939,721 times
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Trees can usually live quite a while with it so I wouldn't panic yet. Fungicide should keep it under control this summer. Prune infected branches when the tree is dormant next winter to get rid of it. If you have wild cherry or wild plum trees in the area, they can be a significant source of it.

This might be helpful: https://ohioline.osu.edu/factsheet/plpath-fru-31
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