Rent Shop Volunteer Join

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

Please forgive us, but Mr. Smarty Plants has been overwhelmed by a flood of mail and must take a break for awhile to catch up. We hope to be accepting new questions again soon. Thank you!

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

Transplanting Hollies in winter
January 12, 2010 - I want to transplant, relocate holly trees in January. Is that ok, and what is the best holly for landscaping?
view the full question and answer

Need suggestions for a small tree for cemetery in NH.
August 30, 2012 - I would like suggestions for picking a SMALL tree for a rural cemetery in Winchester, NEW HAMPSHIRE. Would the delicate Japanese Elm be suitable for the weather, etc?
view the full question and answer

Junipers for restoring area in Bulverde TX
November 03, 2012 - Are ashe or virginiana junipers for sale around the hill country? I would like to recreate the natural plant life that was bulldozed next to my home. Do you recommend any other types of juniper that ...
view the full question and answer

Native replacement for bamboo from Houston
May 21, 2013 - I've read one reply where you do not advise using Bamboo as a privacy fence plant. What do you suggest in its place? The suggestions on the one I read will not work for me. Your suggestions were My...
view the full question and answer

Impenetrable privacy hedge in Wimberly, TX.
July 26, 2011 - I live near Wimberly, TX. I'd like to grow an impenetrable privacy hedge about 200' long and at least 10' tall and 10' deep (or more) using native plants. I'd like it to be evergreen, drought t...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.