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Old September 17, 2021   #2
VirginiaClay
Tomatovillian™
 
Join Date: Jul 2019
Location: Virginia, USA
Posts: 102
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It's called "gummosis," so if you google that you'll get lots of info. Often this is caused by "peach tree canker," a fungus called cyclospora, and the only treatment is to carefully prune away and cut out all the infected wood. If the infection is severe, it's probably too late and you'll have to remove the tree. Or it could be borers -- do you see any evidence of ground-up wood/frass under the sap? If it's borers, you could spray.
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