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
Not Yet Rated

Saturday - September 15, 2012

From: Austin, TX
Region: Southwest
Topic: Diseases and Disorders, Trees
Title: Bark problems with Monterrey oak from Austin
Answered by: Barbara Medford

QUESTION:

I planted a 65 gallon Monterrey Oak (White Oak) in my front yard in February of this year. I water it once a week. All of the leaves and branches appear very healthy and there is no discoloration. About a month ago I noticed some dark areas (patches) on the bottom 5 feet of the trunk. They are not soggy or wounds, just discolored areas. They also don't appear to have a thick layer of bark. Well, about 2 weeks ago I also noticed a small hole with dark sap coming out of it. I have not observed any bugs on the tree or any bug trails. I also haven't pruned or injured the tree in any way. The discoloring and sap are on one side of the trunk ranging from 6 inches to 4 feet of the ground. I would like to know what you think it is?

ANSWER:

First, we would comment that is a heck of a big tree to transplant; luckily, you did it in February, so hopefully we can rule out transplant shock. Maybe.

We have recently answered a couple questions on white oaks (Quercus polymorpha (Mexican white oak, Monterrey Oak) and Quercus laceyi (Lacey oak), both considered resistant to Oak Wilt, but with some similar problems. First, we would ask that you read both of these previous questions, to see if they answer your question.

Austin, TX

San Antonio, TX actually, this is on a Lacey Oak, but it is also a white oak,  considered resistant to oak wilt, but it is a very similar problem

Beyond that, the little hole could be caused by a woodpecker or sapsucker who are shopping for either bugs or the sap in the bark of the tree.

Holes in ash in Austin

Holes in pecan branch in Cooper, TX

In the final analysis, diagnosing a tree we cannot see is a near impossibility. If the situation appears alarming enough, you should contact some of the specialists that are mentioned in the various links.

 

From the Image Gallery


Mexican white oak
Quercus polymorpha

Mexican white oak
Quercus polymorpha

Mexican white oak
Quercus polymorpha

Lacey oak
Quercus laceyi

Lacey oak
Quercus laceyi

Lacey oak
Quercus laceyi

More Diseases and Disorders Questions

Will damage to live oak root make it more susceptible to oak wilt
December 24, 2012 - Hi. I knicked the root of a live oak when digging. Will this hurt the tree and make it more succeptible to wilt? Is there something I can use to protect the exposed part of the root and make it les...
view the full question and answer

White fungus-like growths on plants from Stephenville TX
May 25, 2013 - What is a white fungus-like growth on plants in a garden? It can be seen on the ground in ball-like shapes similar to puff balls or on plants
view the full question and answer

Controlling nematodes on lantana from San Antonio
September 19, 2012 - Can anything be done to "fix" root knot nematode on older lantana. Next to other lantana. Pull them out or try organic fix?
view the full question and answer

Bacterial spot in peach tree in McDade TX
February 05, 2009 - I have a Red Globe peach tree which was planted in February 2008. The local agricultural extension agent identified the tree as having Bacterial Spot in November 2008. They recommended copper hydrox...
view the full question and answer

What to do with a sickly American elm in Austin, Texas
September 27, 2010 - I have an American elm that is about 6 feet tall in my yard. It is has not grown quickly this year--as compared to another American Elm that I have in another spot that is about 3 feet tall and has m...
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