September 22, 2013
peach tree gummosis
Our peach tree got gummosis bad, up and down the whole trunk. I've never seen globs this big. It makes be realize how the amber-preserved mosquitoes from Jurassic Park could really happen.
Gummosis is just the descriptive symptom. Sifting through the internats, it is most likely the tree's reaction to holes drilled by an insect, peach tree borer, or to a fungus, cytospora canker.
I read that some dwarf fruit trees get gummosis as a matter of course, when watered heavily. Ours is a semi-dwarf, but this happened after Colorado's week of record-setting rains (we fortunately didn't get any flooding or hail, but some nearby farms got pretty devastated by hail).
Peach tree borer seems unlikely since they usually burrow below the soil/mulch surface. If it is the canker, that's bad, since you're supposed to remove infected areas and the whole trunk is infected. I'm hoping the tree will pull through. I'm continuing to give it plenty of water.