En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Need to identify white powdery substance on Wisteria in Georgetown, TX.

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

Wednesday - May 11, 2011

From: Georgetown, TX
Region: Southwest
Topic: Diseases and Disorders
Title: Need to identify white powdery substance on Wisteria in Georgetown, TX.
Answered by: Jimmy Mills

QUESTION:

My wisteria shrub has a white powdery substance over the wood base. I have tried spraying a fungicide on it but have seen no improvement. Any suggestions?

ANSWER:


Usually, having white powdery substance on a plant brings thoughts of powdery mildew. This link to Colorado State University Extension talks about identifying the pest and has several suggestions for treatment. The University of California Integrated Pest Management Program is also a good source of information. You can also get help from the folks at the Williamson County office of Texas AgriLife Extension.

You didn’t tell me the species of Wisteria that you have, but there are at least three possibilities here in Texas; two that are natives and one that is non-native. Since the mission of the Lady Bird Johnson Wildflower Center is to increase the sustainable use and conservation of native wildflowers, plants and landscapes, we are all about encouraging native plants.

The native species in Texas are American Wisteria Wisteria frutescens (American wisteria) and Texas Wisteria (W. macrostachys ). However there are those that consider them to be the same species.

Although it is widely planted from Texas eastward in the US, the non-native Chinese Wisteria ( Wisteria sinensis) is considered an invasive species in Texas and many other states. There is a Japanese wisteria (W. floribunda) that is also considered an invasive species.


Wisteria frutescens

 

 












 

More Diseases and Disorders Questions

Lantana isn't blooming in Leander, TX.
August 03, 2011 - I bought a small potted New Gold Lantana about 2-1/2 weeks ago. I planted it in full sun and covered it with mulch. The few original flowers have fallen off. Although, I see a couple of new buds, ...
view the full question and answer

Failure to thrive of pecan trees in Las Vegas NV
October 11, 2009 - In April this year I purchased two 8-foot tall pecan trees in 3-foot square boxes from a local nursery and planted them here in Southern Nevada. I'm sure I dug a large enough hole to provide plenty ...
view the full question and answer

Controlling nematodes on lantana from San Antonio
September 19, 2012 - Can anything be done to "fix" root knot nematode on older lantana. Next to other lantana. Pull them out or try organic fix?
view the full question and answer

Growth on underside of squash plant leaves
August 22, 2009 - I have a mold in my garden that is oval in shape and has spikes growing out of it, the color is yellow. This mold (yup it's not a bug I checked) is all over the underside of my squash plants. Any hel...
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
© 2014 Lady Bird Johnson Wildflower Center