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
1 rating

Thursday - April 17, 2008

From: St Augustine, FL
Region: Southeast
Topic: Trees
Title: Treatment of black mildew on magnolia
Answered by: Barbara Medford

QUESTION:

I think my magnolia has black mildew. How do I treat it?

ANSWER:

We are assuming that your tree is the Magnolia grandiflora (southern magnolia), which is native to Florida. We found an excellent website on this plant from the University of Florida Extension Service. Near the end of the article is a section on Diseases, where we found this information: "Magnolias may be subject to leaf spots, blights, scabs and black mildew caused by a large number of fungi or a bacterium, but they rarely require chemical controls. Raking up and disposing infected leaves may reduce leaf spots next year."

For better on-the-spot information and suggestions on control (or the lack of need for it), go to this website from the St. John's County Extension Office. It has phone numbers and e-mail address for you to contact them. If the problem you are having is widespread, they will be aware of it and can offer you publications and advice in your environment.


Magnolia grandiflora

Magnolia grandiflora
 

More Trees Questions

Caterpillars on Mountain Laurel from Austin
July 25, 2013 - My 1-yr old mountain laurel has been decimated by small yellow and black catepillars. It recovered a bit and pushed out some fresh new growth, and more came and decimated that too. Are these caterpi...
view the full question and answer

Problem with Live Oaks in Mesa AZ
March 26, 2013 - I have two Evergreen Live Oaks in central Arizona. One is flourishing and getting new spring leaves from top to bottom. Its trunk is rough, has large grooves, and the spots where I've pruned look li...
view the full question and answer

Deer-resistant trees for privacy in Texas
January 09, 2015 - I need to find a deer resistant tall shrub or tree to plant and hide the deer fence my neighbor just put up on our property line. My property has full sun in parts and mostly shady in other parts and ...
view the full question and answer

Want to identify caterpillar that is stripping prickly ash in Flatonia, Tx.
April 05, 2011 - What is the 5/16ths long 1/8th inch long pale opaque green caterpillar that strips prickly ash? It has tiny black dots down its spine and along each side. It has stripped two large trees? Will th...
view the full question and answer

Bignoniaceae Family Members Fix Nitrogen?
January 23, 2016 - Do plants in the Bignoniaceae family, such as Tecoma stans and Chilopsis linearis, fix nitrogen into the soil? I ask because they have a bean-type pod. Just curious.
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