En Español

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

Please forgive us, but Mr. Smarty Plants has been overwhelmed by a flood of mail and must take a break for awhile to catch up. We hope to be accepting new questions again soon. Thank you!

Need help with plant identification, visit the plant identification page.

 
rate this answer
Not Yet Rated

Tuesday - August 16, 2011

From: Brenham, TX
Region: Southwest
Topic: Diseases and Disorders, Pests, Watering, Trees
Title: Oak tree with browning leaves in Brenham TX
Answered by: Barbara Medford

QUESTION:

I have a large oak tree in my small back yard. I also have a sprinkler so the tree has been receiving some water. Nevertheless, some of the leaves are turning brown in patches. Would drip watering over days help this situation due to the drought?

ANSWER:

This year, everything is turning brown, some in places like your oak tree, and some all over, indicating a very dead plant. There are all kinds of diseases and pests of trees or, more specifically, of the oak that could be causing this. Here is a paper from Forest Health Protection, Southern Region on Oak Pests. Since we are neither entomologists nor plant pathologists we cannot diagnose the specific problem, especially without seeing it.

But, because of the extreme weather in Central Texas, we are betting on the heat and drought being the source of the problem. Before you even try to find out if insects or disease are causing the browning, we would definitely recommend watering more. Remember how far out from the trunk those roots are growing-at least as far out as the drip or shade line, and usually two to three times that. Drip watering of a tree is really only effective when the tree is very small and newly planted. In that situation, we suggest you push a hose down in the soil and let the water drip slowly until water rises to the surface, at least twice a week during hot, dry weather. For a large mature tree, you need to get water farther out and you probably couldn't get a hose in the ground for drip watering there. Use the sprinkler, moving it around to water each area where roots probably are, and leave it in each position long enough to really wet the soil. Again, twice a week.

The leaves that are brown will not turn green again, it will soon be time for the oak to drop leaves anyway. But if you start providing water to the little rootlets all up and down the length of the main roots, the tree will have the energy to put new leaves on in the Spring season.

 

More Diseases and Disorders Questions

Is yellow tulip poplar alive from Gilbertsville PA
March 30, 2013 - How can I tell if my yellow tulip poplar is alive? thank you
view the full question and answer

Salvia farinacea and rust fungus from Kerrville TX
February 22, 2014 - Are Henry Duelberg salvias (Salvia farinacea)susceptible to rust fungus?
view the full question and answer

Ring of small holes around pecan tree branches
May 05, 2009 - I live outside Cooper, TX and I have a pecan tree about 15 years old, which I just noticed has little round holes (about the size of a pencil) going around the branches. It branches out about 3 feet ...
view the full question and answer

Problems with Thuga occidentalis in Canton MI
May 11, 2009 - I have emerald arborvitae that have become very "shaggy" and somewhat orange at the base of some leaves, while my neighbors look compact and dark green. What am I doing wrong?
view the full question and answer

Desert Willow and Orchid tree with no upper leaves from Kerrville TX
May 30, 2013 - I have two 5 year old Desert Willows planted in my yard. This year only one has leaved out and blooming. The other is bare but the branches are not dead and it has new growth at the bottom. Do you kno...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center