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

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

Ficus pumila on Stucco Walls
October 06, 2015 - Can the creeping fig vine damage the stucco covered walls?
view the full question and answer

Arizona ash tree with brown leaf tips in Las Vegas NV
August 01, 2010 - We've had an Arizona Ash Tree in our yard for over 7 years it was doing fine until last summer, the tree seems to be struggling with the heat, its leaves look like they are burning up and turning bro...
view the full question and answer

Salvia farinacea and rust fungus from Kerrville TX
February 22, 2014 - Are Henry Duelberg salvias (Salvia farinacea)susceptible to rust fungus?
view the full question and answer

Reason for die-back of native Mahonia repens
April 01, 2008 - I have several mahonia repens plants planted on my property. This is the third spring for them and I have noticed that they look like they might be dying out. The leaves have turned brown and are cu...
view the full question and answer

Can a Quaking aspen grow in central Texas?
August 11, 2015 - I live in Austin and like the idea of a Quaking Aspen tree. I live on a creek and the tree(s) would get good sun and water. Am I crazy?
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP | STAFF
© 2016 Lady Bird Johnson Wildflower Center