Two Santa Rosa and one Matheny. What causes a black growth about three inches long and about three sixteenths out from the limb? It seems to be on the smaller limbs mostly. I noticed it last year on the Metheny. This year it looks as if the tree is dieng and with no fruit. Now I see it is spreading to the others. Anybody know what it is and what I can do about it? I've never posted pics before so if you can tell me without pics it would be great. Thanks in advance.
What is killing my plum trees?
- Thread starter fubar2
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Is it black knot?
Urban Forester
ArboristSite Guru
Black Knot is a fungus that is self-replicating. The black growths contain the spores that are released and spread through out the tree. Prune out the cankers (growths) Apply 3 applications of thiophanate-methyl, mixed at labeled rate at 2 week intervals from late April to late May (infection period).
