En EspaŅol

Q. Who is Mr. Smarty Plants?

A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.

Help us grow by giving to the Plant Database Fund or by becoming a member

Did you know you can access the Native Plant Information Network with your web-enabled smartphone?

Share

Ask Mr. Smarty Plants

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
    
 
See a list of all Smarty Plants questions
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.
 
rate this answer
5 ratings

Thursday - July 14, 2011

From: Salado, TX
Region: Southwest
Topic: Diseases and Disorders, Trees
Title: Care of a live oak with decay and perhaps fungus on trunk
Answered by: Guy Thompson

QUESTION:

I have a huge live oak on my property in Salado that just lost a very large branch. The branch had decay in the center and also has a variety of bugs in it, espeically since it has been on the ground for a few days now. what can I do for this tree to help it survive. I'm not sure how much rot is in this tree, but can see a darkend vein down one side ? Also, there is a type of white substance on the bark on one side that is hardened and on the ends of bark outcrops or projections. I've never seen anything like it. Otherwise, the tree looks perfectly healthy all leaves green even on the branch that broke off.

ANSWER:

Decay in the center of a branch or the center of the tree's trunk involves the heartwood, which is already dead.  The important part of the trunk is the cambium, which is the layer a few inches thick (depending on the tree's size) under the bark.  That is the living part of the trunk.  If your tree's trunk has a cavity filled with soft decayed wood, carefully remove it, making sure not to damage the more solid wood.  Until recently it was recommended to fill the cavity with some impervious material like concrete to provide strength to the trunk.  That is now thought to be harmful, and experts suggest leaving the cavity unfilled.  The darkened vein down one side of your oak should not be treated with wound paint or other material.  The white substance on the side of the trunk may be a fungus.  This web site will give you information on fungi infesting oak trees.  If it appears that your tree does have a fungal infection, Mr. Smarty Plants would recommend that you contact your local county extension agent for help in treatment.  Large oaks like yours are too precious to risk losing.

 

More Diseases and Disorders Questions

Problems with Green Cloud cenizo in Tucson, AZ
June 15, 2009 - I have a large number of Green Cloud Texas Rangers on my property. I water all very consistently, once a week and most of these are around 5-6 ft tall and 15 years or more old. We've only had a few i...
view the full question and answer

Possible maple scale on non-native mophead hydrangeas from Newport RI
August 07, 2013 - I have a mophead hydrangea that has small white cottony tufts under the leaves and on the stems. I believe this is maple scale. Is there a home remedy I can use to rid this disease?
view the full question and answer

Reason for die-back of native Mahonia repens
April 01, 2008 - I have several mahonia repens plants planted on my property. This is the third spring for them and I have noticed that they look like they might be dying out. The leaves have turned brown and are cu...
view the full question and answer

Peeling bark on red oak in Plano, TX
April 08, 2010 - I have a red oak that was planted 2 years ago. The trunk is approx. 5 in around. The bark around the bottom of the trunk is peeling off. At first we thought it was rabbits so we put some rabbit gua...
view the full question and answer

Berry-looking parasites on live oak leaves
September 20, 2013 - Dripping Springs TX Live oaks. What are these berry looking parasites on my tree's leaves. As many as 4 1/4 in berries per leaf. I have 3 acres with dozens of liveoaks all having them on the leav...
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center