Canker on peach tree

Asked July 2, 2020, 1:05 PM EDT

My otherwise-healthy 3-year-old peach tree has developed a nasty-looking canker on the trunk. There are also smaller cankers appearing on some of the branches. I left a plastic trunk guard on it through all of last year, which I'm now realizing was probably a mistake. It hasn't suffered any other damage or stress that I know of. The canker gums a lot in wet weather and seems to clear up in dry hot weather. I don't think it's peach tree borer, since I don't see any sign of sawdust or bits of wood in the gum. I'm thinking it might be cytospora canker, but I'm not sure. Is there anything I can do to help my tree? Is it possible the tree will be able to fight this off and recover? The tree doesn't seem affected so far—it has new growth, leafed out nicely, and set a ton of fruit this year.

Hennepin County Minnesota

1 Response

Laboratory analysis might be needed for a certain diagnosis, but, based upon what we can see in the photos, we think Cytospora canker is present.

You may already have seen the following but it contains reliable information about this disease and what to do about it.

Because peach trees aren't reliably hardy in Minnesota, winter is a major stressor. The toll is manifest in various ways and the trees are generally short lived.