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

Curling, Red Leaves on Gaura
July 18, 2013 - My gaura had most of its lower leaves turn red and then fall off. It is July now, I bought and planted it in May where it seemed to do really well growing several more inches tall and blooming nicely....
view the full question and answer

Oak root resistant hedge for Southern California
December 28, 2013 - I live in Southern California and my cypress hedge has oak root fungus. What kind of hedge can I plant that will grow fast and be resistant to the fungus?
view the full question and answer

Evergreen privacy hedge resistant to verticillium wilt
September 27, 2011 - I am looking for an evergreen, fast-growing privacy hedge (over 6') that is resistant to verticillium wilt and has low water requirements. I live in Monrovia, CA and have to replace hopseed bushes w...
view the full question and answer

Bark of unidentified tree splitting in Merritt Island FL
August 10, 2010 - The bark on this 5 yr. old tree is splitting along its branches, like a sausage link splitting along its sides. Almost as if it is/was over-stuffed. Other than that, there are plenty of leaflets, some...
view the full question and answer

Rust on Blackberry
April 17, 2015 - I have two new blackberry bushes that I planted fall 2014. Only weeks after I planted the plant began to have rust color balls under the leaves then leaves began to die and fall off. When I returned t...
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 | STAFF
© 2015 Lady Bird Johnson Wildflower Center