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Avatar for bart2018
May 22, 2020 10:48 AM CST
Tuscany, Italy
Glassy-looking,resin-like stuff is on 2 branches of my Okame cherry tree. Should I just cut off those two branches?
Avatar for oneeyeluke
May 23, 2020 1:45 AM CST
Name: one-eye-luke US.Vet.
Texas (Zone 8a)
Quitter's never Win
Birds Cat Lover Dog Lover Hummingbirder Organic Gardener
Gummosis is the oozing of sap from wounds or cankers on fruit trees. You can get it from environmental stress, mechanical injury, or disease and insect infestation.

Cytospora canker, or Valsa canker, the fungal cause of gummosis, affects stone fruit trees such as apricot, cherry, peach and plum. There is no known cure for Cytospora canker. The best approach in managing this disease is to maintain the health and vitality of susceptible trees. Vigorous trees are less susceptible to Cytospora canker, and if infected will slow the progress of the disease.
NOT A EXPERT! Just a grow worm! I never met a plant I didn’t love.✌
Avatar for bart2018
May 24, 2020 3:51 AM CST
Tuscany, Italy
Thank you so much for your reply! I certainly will try to improve my culture practices. Do you have any advice as to what I should do about the existing problem? Prune it out or just leave it?
Avatar for oneeyeluke
May 25, 2020 2:04 AM CST
Name: one-eye-luke US.Vet.
Texas (Zone 8a)
Quitter's never Win
Birds Cat Lover Dog Lover Hummingbirder Organic Gardener
You can treat gummosis, by removing the darkened area of bark from the tree, plus a strip of the healthy bark until the wound is surrounded by healthy bark.

Once this is done, let the area dry, then remove any of the darkened area of bark from the tree you missed, until you hit the healthy bark. Remove the spots until you hit green bark then let the areas dry. Make sure you water your tree when removing gummosis so the scars can scab-over easily. Big job but it can be done one spot at a time. Good luck.
NOT A EXPERT! Just a grow worm! I never met a plant I didn’t love.✌
Avatar for bart2018
May 26, 2020 3:31 AM CST
Tuscany, Italy
Thanks, I'll try it. I think there are only 2 rather small spots.
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