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
Not Yet Rated

Saturday - June 09, 2012

From: Nevada, TX
Region: Southwest
Topic: Pests, Trees
Title: White ash trees with bunched up leaves from Nevada TX
Answered by: Barbara Medford

QUESTION:

I have very young white ash trees (3' tall planted this winter) The leaves are crippled not opening up bunched up together and have a white powder. Is this aphids mites or what. Only on one tree. The rest have skeleton type leaves. What is the problem and how do I control it. I can send a picture if needed

ANSWER:

Apparently, this is a problem that is going around with ash trees. Here is a previous Mr. Smarty Plants answer on the same subject. According to this USDA Plant Profile map, White Ash is native to the area of Collin County, in north Central Texas, so that should not be a problem. If you follow the plant link, Fraxinus americana (White ash), to our webpage on this tree you will find this statement:

"Susceptible, like many ashes, to a wide variety of disease and insect pests; these usually are not a problem to vigorously growing trees. Seedlings will tolerate quite a bit of shade, but if a full crown is desired, a generous amount of sun will be necessary as the tree matures. Prune in fall."

From this USDA Forest Service website, here is an article on White Ash. Scroll down to the Use and Management section, where you will get a fairly long list of things that can happen to the members of the Fraxinus (ash) genus. The most comprehensive study of pests on ash trees is this one from wiki.bugwood.org.

Sadly, everyone seems to want ash trees, because they are fast-growing and make good shade trees, but they are short-lived.

 

From the Image Gallery


White ash
Fraxinus americana

White ash
Fraxinus americana

White ash
Fraxinus americana

More Pests Questions

Problems with Shumard Oaks and Crepe Myrtle in Cooke Co. TX
September 07, 2013 - I have a Shumard Oak Tree that has been in the ground approx. ten years. It has done great, even passing up some of my older Shumards. In August it began to lose its leaves at an alarming rate. They a...
view the full question and answer

Possible freeze damage in Wax Myrtle from last winter in Bastrop, TX
July 25, 2011 - Our Wax Myrtle is about 7 yrs old and in good shape until this past winter when we had several very hard freezes. Now several of the large branches are dead and more are dying each month. We have not ...
view the full question and answer

Half-life of the insecticide imidacloprid
March 07, 2011 - How long do systemic insecticides such as imidacloprid (Merit) remain active in nursery grown plants? Asclepias curassavica (tropical milkweed)is frequently grown with imidacloprid to prevent...
view the full question and answer

When should cochineal bugs be on prickly pear cactus?
January 05, 2012 - I am a fibers artist that would like to harvest the cochineal bugs from the prickly pear cactus. I would like to know what time of year should I expect to find the cochineal bugs around the Austin ar...
view the full question and answer

Problem with leaves of Texas Ash in Austin
May 21, 2012 - We purchased a 3' to 4' Texas Ash in March 2012. The past few days I noticed new leaves at the top are curled under, have a milky substance on them, and more than a few ladybugs on them. What is thi...
view the full question and answer

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