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

Goldsturm Rudbeckia Stunted and Doesn't Bloom
April 16, 2015 - I have Goldsturm Rudbeckia that never flowers nor gets taller than 4 inches. Meanwhile, my phlox does fantastic in the same area. This area is sand top dressed with black dirt. Please help! Goldst...
view the full question and answer

Changing bloom color from Tulsa OK
June 27, 2011 - How do you change the bloom color?
view the full question and answer

Lantanas failing to bloom, turning brown
October 06, 2007 - The lantana in my front yard does not bloom, is not overwatered but does get watered, leaves turned brown and plants generally have not grown. The lantana in the rest of the yard are in bloom and lo...
view the full question and answer

Possible maple scale on non-native mophead hydrangeas from Newport RI
August 07, 2013 - I have a mophead hydrangea that has small white cottony tufts under the leaves and on the stems. I believe this is maple scale. Is there a home remedy I can use to rid this disease?
view the full question and answer

Bottlebrush buckeye not leafing out from Newburyport MA
June 11, 2013 - We have a bottlebrush buckeye bush that has grown and blossomed for 16 years. This spring the bush failed to produce any leaves and there are no buds in anticipation of leaves. There are a few smaller...
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