Contact Us Host an Event Volunteer Join

Support the plant database you love!

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 - May 21, 2013

From: Fairfax, OK
Region: Select Region
Topic: Diseases and Disorders, Trees
Title: What are the green round growths on the edges of my oak leaves in Fairfax, OK
Answered by: Jimmy Mills

QUESTION:

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 large ones contain a wad of white fuzz similiar to dandelion fuzz

ANSWER:

The growths that you see on the oak leaves are galls, and can be caused by various insects depositing their eggs in the plant. The tree reacts by forming tissue around the eggs, and the insect's larvae develop inside the gall, feeding on the gall tissue. It sounds to me like this may be the Oak Apple Gall. This link explains the condition further. Click here for more images.

The gall wasp Amphibolips confluenta is the culprit in this case.



 

More Trees Questions

Why is my Ash drooping?
June 22, 2009 - Last spring, I bought a house in Austin, TX with a large Ash tree in the front yard. It looked fine last year, but has been looking funny since it leafed out this spring. It's as if the leaves are we...
view the full question and answer

No acorns on mature live oak in Little Rock AR
April 18, 2010 - Why does my very large mature live oak have no acorns?
view the full question and answer

Pruning a rough-leaf dogwood in spring
May 04, 2012 - Is it OK to trim a rough leaf dogwood now? Should I spray after trimming? Thanks
view the full question and answer

Plants for soil with basalt outcroppings in Idaho
March 30, 2008 - We have basalt (lava) outcropping in part of our back yard and know we'll have to search for pockets of soil in which to plant. Any suggestions about what trees or shrubs would have a chance in thes...
view the full question and answer

How fast do trees grow?
September 03, 2008 - Dear Mr. Smarty Plants I would like to know how to tell how much a tree will grow if the average of the trees are growing at the rate of approximately 3 to 3.5% annually. And how do they come up wi...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.