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

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

Determine oak wilt in red oaks
December 12, 2007 - I am concerned my red oaks have oak wilt. How can I tell what is wrong with them?
view the full question and answer

Why are my lemon Cyprees trees turning Black?
April 01, 2010 - I have 3 lemon Cypress plants - all are about 6 feet tall. One of them has started turning black on one side - like it's been burnt. The inside of the plant is also turning black. I assume something ...
view the full question and answer

Leaf drop from maple tree in Minnesota
August 15, 2008 - I have about a 30 ft maple tree in my yard, last fall I trimmed it pretty good because the branches were getting low where you could not walk under it or get grass to grow. This is the 2nd time in abo...
view the full question and answer

Moth using Agarita as its larval food in New Braunfels, TX
March 27, 2009 - What moth uses agarita as its larval food? It is a perennial problem that can nearly defoliate the specimen and severely limit its flower production.
view the full question and answer

Problems with non-native zucchini in Muskogee, OK
July 23, 2011 - In the awful heat of this summer I am still getting zucchini to produce. But, once it grows about 3 inches, it gets yellow on the ends and dies. Am I watering it too much? (I have sprayed for bugs ...
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