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
15 ratings

Thursday - February 04, 2010

From: New Braunfels, TX
Region: Southwest
Topic: Diseases and Disorders, Pruning, Trees
Title: Should I use wound paint when pruning my live oak tree?
Answered by: Joe Marcus

QUESTION:

When trimming live oak branches, is it best to coat the wound on the tree? I have been doing this but have recently heard that it can actually be bad for the tree.

ANSWER:

Once upon a time it was standard practice to treat an open wound on any tree with tree-wound dressing.  However, research showed that painting tree wounds inhibited healing and sometimes actually promoted the growth of tree pathogens by providing them with a protected place and ideal conditions to grow beneath the paint.

Today, the general consensus among arborists is to forego the use of tree-wound sealant and allow fresh wounds to remain exposed to the fresh air where they can heal naturally.

However, live oaks and many other species in the genus, Quercus are exceptions to the rule.  The freshly-cut stumps of oak limbs should always be immediately painted with tree-wound dressing as a prophylactic measure against the spread of Oak Wilt Disease.  Oak Wilt is spread by tiny wood-boring beetles that are attracted to the sap of oak trees.  Fresh wounds on oak trees draw these beetles like porch lights draw moths.  The adult beetles carry on their bodies the fungus that causes Oak Wilt Disease wherever they go and in that way spread the disease.  Be sure and use tree-wound dressing especially made for that purpose.  Regular paint often contains ingredients harmful to trees.

Timing is also important in preventing Oak Wilt Disease spread.  The disease-vectoring beetles are active only when the weather is not too hot nor too cold.  So pruning live oaks only in mid-winter and mid-summer is advised.

Please visit the Texas Oak Wilt Information Partnership website more information on Oak Wilt Disease, how you can protect your trees and help prevent its spread.

Finally, proper pruning technique is every bit as important to your trees' health as whether or not you use tree paint.  The US Forest Service has published an excellent on-line article called, How to Prune Trees, that you will benefit from reading.

 

More Diseases and Disorders Questions

Growth on miniature palm in Los Gatos. CA
October 01, 2009 - I think that my miniature palm is infested with some sort of bug or fungus. Last night it looked fine but this morning there was a large bright yellow fuzzy looking growth on the trunk. Any input wo...
view the full question and answer

Need help diagnosing a problem with Bur Oak in Plano, TX
April 28, 2010 - I planted a bur oak 8 or 9 years ago. It has grown beautifully until this year. When opening, the leaves are very small (a couple inches) and there are lots of seeds (catkins?). I would hate to los...
view the full question and answer

What are the green round growths on the edges of my oak leaves in Fairfax, OK
May 21, 2013 - round growths on the edge of oak leaves. ranging in size from a pearl to a lime. ranging in color from pale green to lime green. hollow, small ones appear to contain one small gnat sized seed. the la...
view the full question and answer

Smarty Plants on Oleanders
June 11, 2005 - I have 3 Nerium Oleanders. In the winter they come indoors, and are under grow lights. They are in big pots. We just put them outside on patio, and they don't look good. They still have green tips ...
view the full question and answer

Rust problems on Jack in the Pulpit in IL
June 12, 2011 - The last 2 years I have noticed that some of my jack in the pulpit plants have something that makes me think of a copper color rust.It seems to start on the underside of the leaves. What can I do to g...
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