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

Tuesday - November 09, 2010

From: Dallas, TX
Region: Southwest
Topic: Trees
Title: Webbing on oak leaves and fuzzy yellow growths on leaf veins
Answered by: Nan Hampton and Eric Beckers

QUESTION:

I have a large red oak(?) and live oak that appear to have the same problem. Clumps of leaves all over the trees are covered by fine webbing and the leaves appear to be curling up and dying in the webs. I have not seen any worms in the webbing and the individual webs do not seem to cover as large an area as web worms that I have seen on other trees in the past. The leaves at the ends of the branches on the red oak are almost entirely covered by the clumps of leaves and webs. The same leaves have another issue on both trees. On the underside of the leaves there are rounded, fuzzy yellow growths on the leaf veins. Is it possible that I have 2 different diseases/insects at the same time? I thought about some sort of leaf galls and spider mites.

ANSWER:

I consulted Eric Beckers with the Texas Forest Service about the fine webbing on your oak trees and he said that he can't imagine anything other than webworm.  The size of the web might have been kept to a minimum by a late hatch after the September rains followed by a very dry October.  Lack of caterpillars could have been a sign of good predator activity (we had a bumper crop of wasps this fall!).

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.  There is no evidence that your two problems are linked since these tiny wasps that produce the galls are not likely to be predators of the webworms.

You might like to contact your Dallas County AgriLife Extension Agency to see if there have been other reports of webworms in your area.

 


 

 

 

 

More Trees Questions

Planting fruit and nut trees in Archer, FL.
January 26, 2012 - We're looking to plant a few fruit and nut trees in Archer, Florida. We've been thinking about figs, apples, peaches, oranges, plums, and whatever nuts grow best here (looks like almonds and pecan...
view the full question and answer

Are palm tree seeds toxic?
July 08, 2011 - Are palm tree seeds toxic to other plants? I have palm trees around my pool and it seems that nothing will grow very good where the old seeds are in the ground.
view the full question and answer

Plants in bloom in April in Stuart FL
February 24, 2012 - Can you tell me which plants I might reasonably expect to see in bloom in April of this year?
view the full question and answer

Slow development in Shumard Oak from Porter TX
April 02, 2013 - We had two Shumard Oaks Planted in Sept of last year (2012). About a month later, they started browning and dropping their leaves (no color change). Now I noticed on one of the trees the buds have sta...
view the full question and answer

Best dogwood to plant in Dallas GA
June 13, 2010 - I am interested in how to select the best dogwood (Flowering) tree to plant in Dallas, GA 30157. The location receives full sun, the soil is typical GA clay/?. I found a list of 20+ Dogwood trees on...
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