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

Yaupons dying back in San Antonio
April 23, 2009 - I have 4 yaupon shrubs in the same area for several years. This past winter one turned brown from inside to outside very quickly. It is dead but the roots are not loose. The others began doing the sam...
view the full question and answer

Waxy deposits on Magnolia fuscata from Ethel LA
June 18, 2013 - I have a 4yr old Magnolia Fascata (aka banana shrub)- I noticed that it has small oval shaped yellow waxy deposits on the branches.. I have also noticed small black ants on the branches. The unknown d...
view the full question and answer

Rust problems on Jack in the Pulpit in IL
June 12, 2011 - The last 2 years I have noticed that some of my jack in the pulpit plants have something that makes me think of a copper color rust.It seems to start on the underside of the leaves. What can I do to g...
view the full question and answer

Grasshopper-resistant landscape plants?
May 20, 2009 - We have a ton of grasshoppers in our area. I would like to plant bushes and flowers that the grasshoppers will not eat. Can you suggest any??
view the full question and answer

Saprophytic fungus on mulch
June 22, 2007 - I just did some major landscaping in my west Austin, TX backyard. I added many native plants and mulched all of the new beds. I did this just before the heavy rains in the past two weeks. I now not...
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