Explore Plants

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
    
 

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

Tuesday - June 18, 2013

From: Ethel , LA
Region: Southeast
Topic: Non-Natives, Diseases and Disorders, Pests, Shrubs
Title: Waxy deposits on Magnolia fuscata from Ethel LA
Answered by: Barbara Medford

QUESTION:

I have a 4yr old Magnolia Fascata (aka banana shrub)- I noticed that it has small oval shaped yellow waxy deposits on the branches.. I have also noticed small black ants on the branches. The unknown deposits do not seem to be affecting plant growth, but just wondering what it is so that I can treat it. Thank you for the response.

ANSWER:

Magnolia fuscata or Magnolia figo (Banana Shrub) is a low evergreen tree native to China.

Banana shrub grows best in an acidic, deep sandy loam soil.  It is basically pest free but can occasionally suffer freeze damage especially in or near zone 7. From PlantAnswers.co, here is some information on Michelia figo, which is a synonym for the same plant. According to the USDA, this plant is only recorded as growing in one county in Mississippi, but obviously you are growing it in Louisiana. From Floridata, more information on Michelia figo.

Since this plant is not native to North America, we have no information on it in our Native Plant Database. However, it sounds very much to us like you have aphids on your plant, which in turn attract the ants. The ants are harvestiing the "honeydew" (aphid poop) which they feed to their young. This is the waxy substance you see on the leaves. It can turn dark with mildew. The article on aphids we referred you to above is from the University of California Integrated Pest Management and has some information on controlling it.

 

More Non-Natives Questions

Blossom fall after rain on Polystachys lutea, Shrimp Lollipop
July 17, 2008 - I live in San Antonio and had previously bought shrimp lollipop plants and after the rain we had recently all the blooms fell off. So my question is did it die or should I just leave it alone?
view the full question and answer

Diamonds and Rubies plant (Lychnis coronaria)
May 02, 2007 - I recently purchased a plant from the Huntsville, AL Botanical Gardens at their annual plant sale. The name on the plant tag is "Rubies and Diamonds". No one at the Botanical Garden knew the scien...
view the full question and answer

Non-native creeping fig and non-native nutgrass in Carmichael CA
September 28, 2009 - Will creeping fig choke out nut grass?
view the full question and answer

Non-blooming toad lily in Kentucky
April 20, 2008 - I have had a toad lily for three years and it has never bloomed. What do I need to do?
view the full question and answer

Non-flowering mimosas in Texas
July 08, 2008 - I have two mimosa trees, about 3 years old. Both were grown from volunteer seedlings. Neither have flowers nor have they produced seed pods. Are they too young or do they need a source of pollenation...
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.