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
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

Replacing Weeds with Native Plants in Dallas Area
May 29, 2011 - I have a large oak tree in my front yard and lots and lots of miscellaneous weeds (clover, chickweed, stickers, etc.). I am wanting to grow grass in my front yard, that is shaded pretty much most of t...
view the full question and answer

Failure to bloom of lantanas in San Antonio
July 22, 2010 - Mr. Smarty Plants, We have lantanas in our front yard. This summer the leaves have turned white and they die to a brown color all the while the leaves are "crispy". At the beginning of the season...
view the full question and answer

Pests on Fan Tex Ash
July 30, 2015 - We planted a Fan Tex Ash last year on our property. It's doing very well, but there are a lot of large stink bugs, yellow jackets and red wasps on it daily. We cannot seem to find any information on ...
view the full question and answer

White fungus-like growths on plants from Stephenville TX
May 25, 2013 - What is a white fungus-like growth on plants in a garden? It can be seen on the ground in ball-like shapes similar to puff balls or on plants
view the full question and answer

Lopidea on Texas Mountain Laurel
March 10, 2016 - How do I get rid of lopidea on mountain laurel?
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