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 - May 26, 2007

From: Austin, TX
Region: Southwest
Topic: Trees
Title: Leaf spot as indicator of Oak Wilt Disease
Answered by: Joe Marcus

QUESTION:

I live close to the Wilflower Center. I have two trees in my front yard which are just now showing brown spots on the leaves. I fear this may be oak wilt. Would it be possible for me to bring some sample leaves to the Wildflower Center and have someone tell me if my trees have oak wilt?

ANSWER:

Browns leaf spot are not normally indicative of Oak Wilt Disease. There are, however, any number of fungi, viruses, insects and other causes which produce spotting of oak leaves. Close examination of the leaves would be required to make a certain diagnosis of the cause. Many fungal diseases are more prevalent in wet years like we are having now. Happily, most oak leaf diseases do not cause serious harm to the trees they attack, though some defoliation may occur.

The Texas Oak Wilt Information Partnership website, which was built and is maintained by the Lady Bird Johnson Wildflower Center and partner organizations, has much more information about Oak Wilt Disease, including information on visual identification.

In the interest of maintaining the good health of the trees at the Lady Bird Johnson Wildflower Center, we would prefer that you do not bring diseased or pest infested plant material to us. A better solution is to send sharply-focused, close-up digital images of the affected plant parts via email to id@smartyplants.org. If we cannot identify the cause of the problem, you may contact your County Extension Service agent, or send a plant sample to the Texas Plant Disease Diagnostic Laboratory at Texas A&M.

 

More Trees Questions

Pollenless Cedar Elms for Georgetown, Texas
September 28, 2010 - I am considering planting the Cedar Elm tree at my home in Georgetown, Texas. I was under the impression that only the female of the species produces the irritating pollen. Is this true?
view the full question and answer

Are red berries of modesto ash toxic to dogs
November 29, 2010 - Are the red berries that come off the modesto ash tree poisonous to dogs if they eat them?
view the full question and answer

Thorny shrub for deterring break-ins in southeast Texas
February 05, 2013 - Looking for a very, very, thorny three or four foot tall shrub for in front of windows to deter break-ins. Considering Rosa Rugosa rose but it is not native.
view the full question and answer

Looking for copper beach (Fagus sylvatica)
December 05, 2008 - I would like to purchase a copper beech tree to plant in CT as a gift. Where can I find one to purchase?
view the full question and answer

Small trees for NJ shore
April 22, 2011 - Hello! What's a good native shrub or small tree to feature in my front yard in Brigantine, NJ, on the Jersey shore. Sunny site, dry, sandy soil. The yard is very small. I'm trying to design a l...
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