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

Thursday - July 04, 2013

From: Katy, TX
Region: Southwest
Topic: Diseases and Disorders, Trees
Title: Chlorotic disease in scrub oak from Katy TX
Answered by: Barbara Medford

QUESTION:

Please tell me how to treat my scrub oak as it has chlorotic disease. Parts of the tree are fine and others have yellow leaves. It has not been injured in any way.

ANSWER:

There are four plants native to North America with the common name "scrub oak." The map link following each plant name refers to the USDA Plant Profile Map on that plant showing to what states it is native. In the case of the two native to Texas, the map indicates the Texas counties in which a scrub oak grows natively.

Quercus dumosa (Coastal sage scrub oak) - endemic (growing natively nowhere else) to California (Map)

Quercus ilicifolia (Bear oak) Also known as  Scrub Oak (Map). Not reported as growing natively in Southwest U.S. at all.

Quercus mohriana (Mohr oak)  Also known as shin oak, scrub oak. (Map) West Texas and Panhandle.

Quercus turbinella (Sonoran scrub oak) (Map) El Paso, Hudspeth and Brewster Counties in Big Bend Area of far West Texas.

None of these sound very likely to be garden plants in Harris, Ft. Bend and Waller Counties, in southeast Texas. Is it possible that you got the wrong common name? As long as it is a member of the Quercus (oak) genus, it probably doesn't matter. Chlorosis in the Quercus genus is usually a product of being grown in incompatible soils.

Please read this previous Mr. Smarty Plants answer on chlorosis in another species of oak, Quercus palustris (Pin oak). We hope this helps you establish what your tree is and the best ways to deal with chlorosis.

 

From the Image Gallery


Coastal sage scrub oak
Quercus dumosa

Mohr oak
Quercus mohriana

More Diseases and Disorders Questions

Is it normal for the bark to fall off an oak tree in Austin, TX
May 02, 2013 - Is it normal for live oak bark to fall off when touched? I am afraid to get near them?
view the full question and answer

Problems with maple tree in Redding CA
July 17, 2012 - I have a 2 yr. old October Glory tree that is looking bad. It leafed out this spring, but not as much as the others. In total I have 9 red maples along a fence row about 15 feet apart. The trees on ei...
view the full question and answer

New nursery plants with sappy spots from Round Rock, TX
September 09, 2012 - We live on the west side of RR, near Cedar Park and recently bought three 15 gallon cherry laurels from a nursery. Started to plant them today as we bought them a week ago and noticed base of the trun...
view the full question and answer

Clear pungent, liquid oozing from oak tree
June 28, 2010 - I have a large oak that over the last few days has been oozing a pungent, non sticky, clear substance from one specific site (no damage) about the size of a dime. It's attracting quite a few gnats, m...
view the full question and answer

Gaura Plants Dying In PA
July 16, 2014 - I had six gaura plants. They were beautiful last year. Now I have one that is doing well and the others are dying slowly one at a time. I don't understand this. They are on a slight slope and have ...
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