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 - August 23, 2010

From: Austin, TX
Region: Southwest
Topic: Diseases and Disorders
Title: What's that sticky stuff on plants under many trees?
Answered by: Jimmy Mills

QUESTION:

Here in Austin, I've recently noticed a sticky film appearing on shrubs, flowers, grass, etc. under many trees. It appears to be coming from the trees under which they are planted. The sticky film seems to be attracting white flies and other pests to these plants. Is there currently some sort of tree insect infestation that is causing this or are the trees stressed due to the recent heat? It doesn't appear to be moisture due to transpiration.

ANSWER:

What you are experiencing is the annual onslaught of honeydew here in Austin. Honeydew is a waste-product of aphids and other sap-sucking insects such as scale. As honeydew is excreted by sucking insects, it falls and coats any surface upon which it lands. Here is a previous answer from last Fall.

This article from University of Minnesota Extension , and another from the University of Kentucky College of Agriculture  give a rather thorough explanation of honey dew and aphids and their effects on plants.

You may also notice blackening of the plants under the trees because of an infestation of sooty mold that grows on the honeydew.

 


 
 

More Diseases and Disorders Questions

Black fungus on cholla cactus from Austin
March 25, 2012 - How to get rid of black fungus on cholla cactus? Cut it off? And treat with what?
view the full question and answer

Long term effects of pesticide from Lubbock TX
March 20, 2013 - I have 9 western pecan trees about 20 years old. Trunk sizes is from 18" to 39". I used a product Bayer Tree and Shrub, applied to the trees. I wonder what it will do to the trees. I talkd to Bayer ...
view the full question and answer

Problems with October Glory maple tree in Evansville IN
June 10, 2010 - We have a 15 yr. old October Glory maple tree. 2 years ago we had a bad ice storm and this tree was covered with 1/2 to 3/4 " of ice. The tree resembled a chicken wishbone with its limbs touching ...
view the full question and answer

Bark splitting in old tulip tree in Red Creek, NY.
May 18, 2013 - Hello, We have a tulip tree that has some bark splitting I guess I would call it. The tree is older and very tall. On the north side of it starting at the bottom of the trunk to about 8-9 feet up i...
view the full question and answer

Muhly grass slow to green up from Spring Hill FL
August 04, 2012 - Have lots of muhly grass planted 3 yrs ago. This yr about 1/3 are VERY slow. Still look like hay stacks. No pattern in the bed. You mentioned pesticides being too close?
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