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 - December 12, 2013

From: Austin, TX
Region: Southwest
Topic: Pests, Trees
Title: Galls on live oak tree in Austin
Answered by: Nan Hampton

QUESTION:

I live in Austin, and have a 13 year old live oak in my yard. It has developed little spheres, kind of like green peas, on the underside of the leaves. What is it? Is it harmful? Is there something I should be doing to get rid of them?

ANSWER:

Mr. Smarty Plants is going to refer you to the answer to a recent question from someone else in Central Texas with the same, or at least similar, problem.  The little spheres are galls made by the trees tissue in response to the developing larva of an insect feeding on the leaf.  The galls are rarely injurious to the tree and there isn't really a method (such as spraying) to kill the larva inside the gall.  Here is a copy of the answer:

"They are galls caused by the trees reaction to insects laying their eggs in the leaves. The tree's tissues expand and grow around the developing egg and the resulting larvae that feeds on the plant tissue before emerging as an adult.  The galls may not be aesthetically attractive but they are not especially deleterious to the trees.  There is really no way to "treat" them since the insect is safely ensconced within the gall and won't be reached by any insecticide.  Here are some articles related to galls from Texas A&M Texas Plant Disease Diagnostic Lab and from Texas A&M AgriLife Extension.  Here are photos of oak leaf galls caused by Belonocnema tratae and more photos of oak galls from the Central Texas Gardener blog."

 

More Pests Questions

Non-blooming toad lily in Kentucky
April 20, 2008 - I have had a toad lily for three years and it has never bloomed. What do I need to do?
view the full question and answer

Dealing with aphids on milkweed plants in Alloway, NJ.
July 11, 2012 - I planted milk weed for the Monarch butterfly. Every year it gets orange aphids that seem to suck out the juices and eventually kill the plant sooner than I like.
view the full question and answer

Insects attacking Gregg's Blue Mistflower from Comfort TX
June 20, 2013 - I have a beautiful stand of Gregg's Blue Mist flower that have been attacked by an unknown insect. The new growth is curled and stunted and it is not flowering. I'm not alone..I've seen the Gregg'...
view the full question and answer

Controlling slugs in a Pacific Northwest strawberry patch
February 04, 2013 - Would love to plant various varieties of strawberries on a bank for erosion control and ground cover. How can we keep the slugs at bay? We are in the the Pacific Northwest
view the full question and answer

Cause of yellowing buffalo grass (Bouteloua dactyloides)
June 07, 2008 - We are getting large yellow areas in our buffalo grass lawn and think this is probably due to grub worms. Are grub worms the likely culprit and if so, what is the best way to get rid of them? We don...
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