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 Trees Questions

Late leafing and early leaf-drop of Ohio buckeye tree
October 28, 2005 - We recently bought a house which has an ohio buckeye tree in the back yard. It stands about 40 feet from a large creek in Troy, Ohio. The tree is about 30 feet tall. A strip of the bark is missing....
view the full question and answer

Removing and replacing juniper bushes
June 20, 2008 - Hi! I'm pulling up juniper bushes. (just don't like it) I'm getting down to the roots now on one side and I'm having a hard time getting them up. Any recommendations. They are near my drive...
view the full question and answer

Care of lemon cypress from Winter Springs FL
April 14, 2011 - Please send me information on care of lemon cypress plant. I have one in small container on my patio. Should I take it in the house? Send any helpful information on its care. Thank you.
view the full question and answer

White ash trees with bunched up leaves from Nevada TX
June 09, 2012 - I have very young white ash trees (3' tall planted this winter) The leaves are crippled not opening up bunched up together and have a white powder. Is this aphids mites or what. Only on one tree. Th...
view the full question and answer

Quercus polymorpha or Mexican white oak
June 19, 2007 - On the Texas Oak Wilt Information Partnership website, they list a "Monterrey Oak" as one of the White Oaks (#3 in the FAQ section). I cannot find Monterrey Oak in your Explore Plants section; does...
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