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
1 rating

Thursday - June 11, 2009

From: Arlington, TX
Region: Southwest
Topic: Trees
Title: Sticky white substance from Arizona Ash tree in Arlington TX
Answered by: Barbara Medford

QUESTION:

Our Arizona Ash Tree is producing a white substance that floats down from the tree almost like a snowflake the size of a bb. You cannot see it on the tree/leaves. When it lands on the car, it takes the shape of a tiny pyramid and when you wipe it off, it leaves a greasy residue. What is this and how do we get rid of it? We've had these trees for many years and have never seen this before. Thank you.

ANSWER:

Fraxinus velutina (velvet ash), also called Arizona Ash, is discussed in this USDA Forest Service website Velvet Ash. Among the pests that are mentioned in that article are ash borers and verticillium wilt. Neither of these present the symptoms you are describing. Another possibility is found in this forestpests.org site Woolly Ash Aphid. One more suspect is found in this University of Florida Institute of Food and Agricultural Sciences website Ash Whitefly.

Since we are gardeners and neither plant pathologists nor entomologists, about the best we can do is suggest you look at these websites we have mentioned and see if you recognize any of the symptoms. Then, consider contacting the Texas A&M AgriLIFE Extension Office for Tarrant County. Perhaps there are others in your area experiencing these problems, and they can help you with a diagnosis and, hopefully, a solution. 

 

More Trees Questions

Southern Magnolia Damaged by Deer
April 16, 2015 - I have a young Southern Magnolia (about 6 feet tall) that was damaged by deer on the main trunk. The bottom 2 feet looks okay, but where they damaged it and tore branches off, and above that, the leav...
view the full question and answer

Eliminating suckers from roots of Moraine locust in Hilliard, OH
July 07, 2009 - We removed a large Moraine Locust tree and also the stump. Now little trees from the roots are coming up. How do we get rid of these so something else can be planted?
view the full question and answer

Effects of patio under large tree
July 17, 2008 - I would like to put in a patio under a fairly large tree. I understand a tree needs some open ground around it for air and water. Can I use flagstone leaving 6-10 inches of space between the stones?...
view the full question and answer

Companion Plants for Texas Mountain Laurel
March 12, 2015 - I am building a garden from scratch and need help. I want to plant a Texas mountain laurel on each front section of my house in front of a window, and I also want to use Thumbelina Leigh English laven...
view the full question and answer

A year and a half old live oak tree is doing poorly in Nevada, TX.
May 08, 2012 - We planted a live oak tree about a year and a half ago. the tree is still rather small. The leaves are of a vibrant green, however the leave have only grown through the center of the tree and not out...
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