Sap oozing from plumless plum tree

Asked March 9, 2017, 1:43 PM EST

I just noticed that there is reddish sap oozing from my plumless plum tree, off of one of the limbs. It is not around the bottom and I don't see it on any other limb. The limb in question was trimmed 18 months ago with a large limb cut off of it. Can you tell me what the problem is or might be and how I take care of it? (Photos attached.) Thank you.

Denver County Colorado

1 Response

The gummy ooze and discoloration may be symptoms of a fungal disease called Cytospora. It is possible that the infection was what necessitated the removal of the large limb 18 months ago.

I recommend you get an arborist out to make an on-site diagnosis and evaluate the tree. You can find a certified arborist on the International Society of Arboriculture website using their zip code tool (