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 Trees Questions

Best fertilizer for live oak trees in Central Texas
April 22, 2010 - What is the best fertilizer for live oak trees in Central Texas?
view the full question and answer

Color year round, welcome to Austin Texas.
December 04, 2011 - I am new to Austin and want to plant colorful flowers for fall and winter that get a "wow" reaction. I have not seen much at the local nurseries. Any and all suggestions are greatly appreciated!
view the full question and answer

Surface tree roots hurting grass in Houston
March 21, 2013 - We have 2 mature Arizona Ash trees in our yard (30-40'). One of them is in a sunnier location and has developed an extensive network of surface roots (up to 1 to 1 1/2" Dia.) between the tree and th...
view the full question and answer

Amelanchier arborea (common serviceberry) native to Ohio
March 25, 2007 - I want to plant a row of serviceberries for the fruit. I will plant a variety that attains 6 to 10 feet. I was about to order amelanchier alnifolia var. Smokey, as it's described as having very tasty...
view the full question and answer

Transplant shock in Mountain Laurel in San Antonio, TX
June 03, 2011 - I planted a 2 ft. tall Texas mountain laurel a month ago. Some of the leaves have turned very yellow and some of them are falling off. The plant doesn't look real healthy in general. I did add s...
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