Sap oozing from plumless plum tree
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
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 (http://www.isa-arbor.com/).