En Español

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

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

Palm trees turning orange in Miami
May 24, 2010 - Why are my palm trees turning orange?
view the full question and answer

Powdery mildew hits Rock Rose in Round Rock Texas
May 05, 2011 - My beautiful Rock Roses have gotten spots of white fuzzy "fur" on their leaves in the past month. This is not something they have ever had before and I'm worried its some kind of disease. Is it so...
view the full question and answer

Fronds turning brown on yucca in Leander, TX
April 13, 2009 - Dear Mr. Smarty Plants, I live Northwest of Austin in Leander and have grown a spanish dagger yucca for several years. It is 8 feet tall and each spring it puts up a showy spike of blooms. The old fr...
view the full question and answer

Disease-resistant squash varieties for Central Texas
February 03, 2008 - Can you give me names of some disease-resistant summer squash varieties available in Central Texas?
view the full question and answer

Gaura Plants Dying In PA
July 16, 2014 - I had six gaura plants. They were beautiful last year. Now I have one that is doing well and the others are dying slowly one at a time. I don't understand this. They are on a slight slope and have ...
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 | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center