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

Thursday - May 01, 2014

From: Houston, TX
Region: Southwest
Topic: Non-Natives, Diseases and Disorders, Pests, Transplants, Shrubs
Title: Problems with non-native Banana Shrub from Houston
Answered by: Barbara Medford

QUESTION:

My 7' beloved Banana Shrub (magnolia) has white dots on top of the leaves and nasty black stuff covering the backside of the leaves. The plant is dropping leaves. What can I do to save it? I has been in a big pot for 13 years and when I saw the white spots and black nasty stuff last week, I transplanted the root bound tree into the ground where it will get more sun. I pulled open the roots and cut them as best I could. I have been spraying and wiping the leaves, top and bottom with Palmolive dish soap in water for three days now. But the tree looks very sick. Please, please help. Madalene Hill of Festival Hill in roung Top gave me this tree 13 years ago so it is very dear to me.

ANSWER:

We were very confused when you referred to your plant as a Banana Shrub (magnolia). Here is information we got from Wikipedia:

"Magnolia figo (also called Banana Shrub, Port Wine Magnolia, Michelia figo) is an evergreen tree growing to 3-4 m tall. It is native to China. Susceptible to black soot."

The Lady Bird Johnson Wildflower Center is dedicated to the growth, protection and propagation of plants native not only to North America but also to the area in which those plants are being grown; in your case, Harris Co., TX. That is what confused us, we knew that Banana Shrub was not in our Native Plant Database but magnolias are native to North America and, in fact, Magnolia grandiflora (Southern magnolia), is native to Harris County.

Magnolia figo, alas, is not, but is native to China. This puts it out of our area of expertise; however, we might be able to make a couple of suggestions as to what is wrong. The first thing that comes to mind is aphids - they are small white bugs, and deposit aphid poop on the bottom side of leaves of affected plants, which then turns a moldy black. Check out this article from the University of California Integrated Pest Management on what that pest looks like and how to deal with it. The article from Wikipedia also mentioned "Susceptible to black soot." When we searched the Internet on "black soot plant disease" we got this article from Gardening Know How on Sooty Mold. When we read that article it sounded a whole lot like aphids, again, were causing the problem. Hopefully, from one or the other you will get help for your plant.

 

More Pests Questions

Loss of leaves from globe willows in Utah
July 26, 2008 - I have four globe willows that have been in my back yard for the past 6 years. For the past month they have been losing their leaves from the bottom up. We had aphids in some of our other trees and ...
view the full question and answer

Can tulip tree sap be used to make syrup in Bunker Hill IN?
July 10, 2009 - I was just wondering if tulip tree sap could be used to make syrup. I saw the sticky stuff on the leaves and decided to taste test it and it was very sweet, unfortunately I later found out that I was ...
view the full question and answer

Infestation of shiny red and blue/black beetles
May 27, 2014 - I have an infestation of 1 cm long shiny red and blue/black beetles. They have red heads with black eyes and antenna, 2 (?) red spots on their sides, and a bluish black body. Before I kill them with ...
view the full question and answer

Berry-looking parasites on live oak leaves
September 20, 2013 - Dripping Springs TX Live oaks. What are these berry looking parasites on my tree's leaves. As many as 4 1/4 in berries per leaf. I have 3 acres with dozens of liveoaks all having them on the leav...
view the full question and answer

Ants in vegetable garden in Muskogee OK
May 25, 2011 - I have ants in my vegetable garden this spring - I think because of all the rain. I think they are the culprits that ruined my spinach and swiss chard. They have left all the lettuces alone..but you...
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
© 2014 Lady Bird Johnson Wildflower Center