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

Friday - November 21, 2008

From: Caledonia, MI
Region: Midwest
Topic: Pests, Trees
Title: Black coloration on Star Magnolia is probably sooty mold.
Answered by: Jimmy MIlls

QUESTION:

I have a star magnolia where 90% of the bark has turned black. It almost looks burned. The tree has decent buds set for next spring. What is causing the bark to turn black?

ANSWER:

The black coloration on your Star Magnolia is most likely due to sooty mold.  Sooty mold is a fungus that grows on a sweet substance called honey dew.  Honey dew is secreted by scale insects and aphids that feed on trees. If your Magnolia hasn't lost all of its leaves yet, you can probably find the sooty mold on the foliage as well.  You should also look for scale insects clinging to the twigs of your tree. The sooty mold fungus is non-parasitic and probably will not damage the plant, but it is unsightly. The scale insects, on the other hand, are a problem that needs some attention.

I'm including links to four web sites that will make you more knowledgeable about Magnolia scale as well as sooty mold.

Magnolia Scale: Penn State University College of Agricultural Science and the Univeresity of Wisconsin Extension Service.

Sooty mold: University of Vermont Extension Service, and the University of Hawaii Extension Service

Another source of information closer to home would be to contact your County Extension Agent

 

More Pests Questions

Discouraging Poison Ivy
June 27, 2015 - Is there a fern that discourages poison ivy from growing?
view the full question and answer

Something eating holes in Texas Betony from Austin
June 06, 2012 - What pest is eating holes in the leaves of my Texas Betonys? They look healthy but almost all leaves have various sizes of round holes in them. What is the best cure for this? Thanks
view the full question and answer

Caterpillars attacking mountain laurel in Marble Falls TX
August 27, 2009 - What are the caterpillars that eat up our mountain laurel? Nothing left but a few stems.
view the full question and answer

Problem with leaf cutting bees in Houston, TX
December 08, 2014 - I have four Arapaho crepe myrtle trees in my backyard and two have leaves, especially the young leaves, being eaten by something. I do not see ants of beetles on the leaves and have not seen any bees ...
view the full question and answer

Need bug repelling plants in Arlington, VA
February 08, 2010 - What kind of plants are best bug repellents, and need little or no maintenance. I'm a city girl and don't like bugs (spiders)
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 | STAFF
© 2015 Lady Bird Johnson Wildflower Center