Damaged Apricot

Asked June 5, 2017, 7:30 PM EDT

My 8-year old apricot tree appears to have brown rot on dead me if the branches starting about 2 weeks ago. Just this weekend, the trunk and some of the larger lower branches started leaking sap. Is there any way for me to treat/save my tree?

Hennepin County Minnesota

3 Responses

Thank you for the question. Without photos, I can't be of much help. The problem could be disease, insects, or environmental problems. Please read our publication on stone fruits: http://www.extension.umn.edu/garden/yard-garden/fruit/integrated-pest-management-for-home-stone-fruit-growers/index.html

You may be able to figure it out. If not, please submit your question again along with clear photos of the problem as well as a shot of the entire tree.

I apologize for forgetting the photos. I've included a full tree photo, plus one of the sap on the trunk and one of the brown rot (?) on the branches.

From your description of the problems with your apricot tree and the photos, it appears that your tree may be infected with peachtree borers, also known as greater peachtree (crown) borers (Synanthedon exitiosa).

Below is information about peachtree borer from the University of Maryland Extension:
https://extension.umd.edu/sites/extension.umd.edu/files/_images/programs/hgic/Publications/HG77_IPM_...
"Symptoms:

Gum oozes from holes at base of trunk or lower branchcrotches (sawdust-like frass may be
observed). Brers feed on cambium below the bark near base of tree, preventing food and water from flowing within the tree.This leads to wilting symptoms .Shoots with wilted leaves; shoot die

Management:
Borers attack stressed trees. Monitor for borer holes. In May, scrape away gum and dead bark from lower trunk and large roots. Come back in one week and look for new gum and frass deposits. Make vertical cuts with a sharp knife through these entrance holes. Then,insert a stiff thin wire and stab larvae; repeat in one week and then mound soil over damaged area (if low on the trunk). Band lower trunk down below soil level with corrugated cardboard to prevent egg laying or trap larvae before they tunnel nto tree. Where holes and frass are observed and no sap is oozing from tree, beneficial entomopathogenic nematodes may be used as a drench applied to the trunk or injected into borer holes. Paradichlorobenzene crystals (PBD) can be applied to the soil around the base of the tree (keep crystals 1-2 inches from bark). Cover the crystals with 4-5 inches of soil. The fumes from the crystals will kill larvae and prevent egg laying. PDB can be used in late summer or spring."

Here are links to websites that may provide you with more information about peachtree borers and how to manage them:
http://extension.usu.edu/files/publications/factsheet/greater-peachtree-borers07.pdf
https://entomology.ca.uky.edu/ef200