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
1 rating

Tuesday - March 20, 2012

From: Austin, TX
Region: Southwest
Topic: Pests, Trees
Title: Leaf Galls on Live Oak
Answered by: Becky Ruppel

QUESTION:

Hi - I have a live oak tree that always seems to have thinner foliage than our other two. Upon closer examination today I found small brown balls all over the mature leaves. The balls look and feel very much like peppercorns. What is this, and is this a danger to the tree? I did read the other post about Woody oak twig galls but based on that post I don't think that is what is going on here. Thank you for your time.

ANSWER:

The tree in question sounds like it has leaf galls formed by the Mealy Oak Gall Wasp Disholcaspis cinerosa.  This wasp forms both stem and leaf galls depending on the stage in its life-cycle.  Galls are formed when an insect (in this case a type of tiny wasp) lays an egg just under the surface of a stem or leaf.  A gall is formed because the tree is stimulated by the presence of the egg, and eventually the hatched larvae, to grow a structure around the wounded area.  Galls are very common in oaks and are not considered harmeful to the health of trees.

For more detalied information about Mealy Oak Gall Wasp see the Mr. Smarty Plants post by Nan Hampton that talks about the specifics of the wasp, its reproduction, life-cycle, and affect on trees. 

The links in that post appear to no longer work. Below are updated links for the information cited in that answer about Mealy Oak Gall Wasps. 

"The Mealy Oak Gall on Ornimental Live Oaks in Texas"

"Gall Making Insects and Mites"

 

More Pests Questions

Plants that donkeys won't eat
August 08, 2012 - What plants/trees do donkeys NOT like? I live in Hawaii on the Big Island and they visit once a week in my yard. I like them but would prefer that they stay just outside. Unfortunately they like my...
view the full question and answer

What's attacking my Nellie Stevens Holly plants in Iredell, TX?
June 27, 2011 - I just bought 10 Nellie R. Stevens holly bushes and planted them as a screen. The leaves on some of the plants are at least half white - not yellow but white. Apparently they were like that when I b...
view the full question and answer

Mites in soil of house plants
June 25, 2008 - Hi there! I recently noticed tiny silver mites in the soil of my plants that I only notice after watering. These plants are indoors in on a window ledge (a dwarf palm, aloe plant and Hawaiian Scheffle...
view the full question and answer

Problems with mountain laurel from Sunrise Beach TX
August 29, 2012 - In Llano Co., TX near lake LBJ, crushed granite type soil - my 4 - 5 year old TX Mtn. Laurels (2), about the size of large wheel barrows, are turning very pale, dropping leaves and on 1 the seed pods ...
view the full question and answer

Why are the eastern red cedars in Bastrop/Travis County turning brown?
May 11, 2009 - I live on the Bastrop/Travis county, TX line and have many eastern red cedars on my property. About 10 of them are dying and it has happened quickly with the onset of the warmer weather. I noticed d...
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