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

Saturday - November 20, 2010

From: Georgetown, TX
Region: Southwest
Topic: Trees
Title: Black spots and fuzzy circles on live oak leaves
Answered by: Nan Hampton

QUESTION:

We live in Georgetown Texas and have many Live Oaks on our property. Lately some leaves have fallen off which have fuzzy round circles on the back along with some little raised black dots. Should we be alarmed?

ANSWER:

The fuzzy yellow growths on the underside of the leaves are most likely galls caused by a tiny wasp.  Acraspis erinacei, Andricus quercusflocci, Andricus quercuslanigera, Andricus laniger, Andricus fullawayi and Andricus ignotus are all gall wasps that produce fuzzy galls on oaks.  The galls aren't likely to affect the health of your trees at all so there is really no need to do anything about them.

The black spots are probably caused by a fungus.  There are several that affect Quercus virginiana (Coastal live oak) and Quercus fusiformis (Escarpment live oak); but, like those with the insect galls, unless they are heavily infested there is no need to treat them.  Here is some information from Florida Department of Agriculture about tar spot caused by the fungus, Trabutia quercina.  You can read about common diseases of oaks from the Neighborhood Association of Southwestern Williamson County and here is Dr. Jerry Parsons', the Bexar County Extension Agent, take on problems with live oaks in Texas.  If your infestation is severe enough that you think treatment is necessary, contact your Williamson County AgriLife Extension office to ask for their advice on treatment.

 

More Trees Questions

Problems with non-native Chinaberry tree from Tucson AZ
September 05, 2013 - I have a 30+ year old Chinaberry tree and this year the branches are much sparser with leaves and there are a lot of small dead branches. Should I fertilize and what should I use? Thank you
view the full question and answer

Fast growing shade tree for East Texas Piney Woods
April 11, 2013 - What is the fastest growing shade tree for E.Tx.Piney Woods? We have an area that desperately needs protection from the summer heat. The site is comprised of gumbo clay and there are no other plants t...
view the full question and answer

Propagating Magnolia grandiflora from Murfreesboro TN
August 03, 2011 - There are several Magnolia grandiflora (Southern magnolia) that have been planted in my neighborhood in middle Tennessee by a landscaping company, and now that they all appear to be producing seeds, ...
view the full question and answer

Privacy Hedge Suggestions for Tampa, Florida
May 15, 2014 - My back wall is made of stone and is about 6' high. We are very close to a busy road. I need a plant that will reach about 7-8 feet high or a hedge to reduce some of the noise. What plant/hedge would...
view the full question and answer

Growth rate of mesquite (Prosopis glandulosa)
August 16, 2009 - What is the growth rate of Mesquite? How long does it take for Mesquite to achieve a 4-6 inch wide trunk? I can't seem to find this information.
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