Huge Native Pecan tree fungus/mushroom growth

Asked November 14, 2016, 11:28 AM EST

I am attaching a picture of a fungus? growing at the base of our beautiful native pecan. Is this a problem? It has a strong odor like a rotting smell. The tree is very vulnerable but important to our landscape at lake LBJ. Please advise if we need to treat this tree. We had an arborist suggest using root stimulant spikes and quoted $800.
I would appreciate your expert opinion. By the way, we have this mushroom-like growth at various spots in the yard but attribute that to the rain and damp soil.
Thank you for your help! Judy Miller

Burnet County Texas

1 Response

This looks similar to Armillaria root rot. I'm going to quote a description of the mushrooms because the USDA Forestry Service describes it better than I do :
"The mushrooms of the different species vary somewhat but generally have yellow or brown stalks about 2 inches (5 cm) long, and a ring is sometimes found around the stalk just below the gills. The stalks have honey-yellow caps, 2 to 5 inches (5 to 12.5 cm) across. The upper side of the cap may be slightly sticky and dotted with dark brown scales; underneath, the cap has light-colored gills, which produce millions of light yellow to white spores. "

If it's Armillaria root rot, root simulators aren't going to help. I would recommend consulting certified arborists on this list http://www.isa-arbor.com/findanarborist/findanarborist.aspx. I would not call this arborist to treat tree diseases again.

You can find more information about Armillaria root rot here:
http://edis.ifas.ufl.edu/ep478
https://www.na.fs.fed.us/spfo/pubs/fidls/armillaria/armillaria.htm
and here:
http://plantdiseasehandbook.tamu.edu/problems-treatments/problems-affecting-multiple-crops/mushroom-...

This disease is usually fatal in 1-3 years. But it might not be Armillaria root rot. I would encourage you to bring a sample by your local extension office or consult with a local Master Gardener group.