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

Monday - July 30, 2012

From: Austin, TX
Region: Southwest
Topic: Pests, Trees
Title: Something dripping from red oak in Austin
Answered by: Barbara Medford

QUESTION:

There is a large red oak outside my apartment. The leaves are shiny and covered with what appears to be oil. The ground underneath is coated with this also. When I parked under the tree my car became covered with oil. It came off easily at the carwash. I don't see any bees or insects and the tree appears healthy. It could be sap, except that it seems to be coming from the leaves. My main concern is that this is possibly an insect infestation.

ANSWER:

Because we are hearing about so much dripping from trees, frequently from oaks, that we are going to take a chance and send you links to some previous answers. It seems to be an absolute epidemic in Austin this year, possibly because of the weird weather.

Austin, July 14, 2012

Boca Raton, FL July 10, 2012

These were just the most recent on the subject. We have about 100 questions on aphids in our previous Mr. Smarty Plants questions.

Since this oak is apparently on the grounds at your apartment, you should probably alert the management to have their garden maintenance people examine it. Emphasize, NO HERBICIDE! The herbicide will kill beneficials (like lady bugs) that feed on the aphids and not faze the aphid eggs waiting to hatch into more aphids.

 

More Pests Questions

Spots on calycanthus petals from Buckley WA
June 20, 2013 - Petals on calycanthus develop black spots the turn into holes. Problem appears shortly after buds open. Occurs every year. Foliage is healthy. Plant growing well and doubles or triples size every ...
view the full question and answer

Sticky material dripping from tree in Austin
July 22, 2012 - The tree in my backyard is dripping what I surmise is sap - a thick,fdrake1@ sticky substance in July. What kind of tree is it and is there anything one can do prevent this from happening? Thank you...
view the full question and answer

Food for wild rabbits in Shiro TX
July 15, 2009 - There are usually 1-2 cottontail rabbits sharing our 4 acre habitat that are suffering due to the lack of new growth caused by drought. Is there anything I can plant after this summer that would provi...
view the full question and answer

Green cyst-like growths on Texas persimmon leaves
September 20, 2013 - We have a mature Texas persimmon. We just noticed some green cyst-like growths on the tops of some of the leaves. The undersides of those leaves have black spots where the growths are. They looks like...
view the full question and answer

Perennial plants resistant to cutter ants in Aransas Pass, TX
January 12, 2010 - We are moving to Aransas Pass, Texas. Are there any perennial plants resistant to cutter ants?
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