En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Sooty Mold on Beauty Berry

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

Tuesday - May 19, 2009

From: Houston, TX
Region: Southwest
Topic: Diseases and Disorders
Title: Sooty Mold on Beauty Berry
Answered by: Nina Hawkins

QUESTION:

We recently planted a beauty berry plant (among others) to attract birds in our backyard. We have had a lot of rain (probably 5-7 inches) since planting a few weeks ago if that might have something to do with the problem. There appears to be black mold on the underside of the leaves. How can I rid the plant of the mold and not poison the birds? I read that I should spray the plant with malathion but that worries me since we are attracting birds.

ANSWER:

The black mold that you are seeing is probably sooty mold.  Sooty mold is usually caused by the honeydew excretions of sucking insects such as aphids and scale, which often suck plant juices from the protected undersides of leaves where you noticed the mold on your plant.  The mold is likely less harmful to the plant than the insects are.  Your least toxic choice for controlling scale or aphids is to release their natural predators into your yard, such as lady bugs or parasitic wasps, which are available at many plant nurseries and through mail order.  Follow the instructions that come with the insects - they should tell you to release the insects in the evening and to water beforehand to encourage them to take up residence in your yard rather than fly off to someone else's.  Your next option is to use an insecticidal soap or horticultural foliar oil, depending on whether you have aphids or a type of scale. You should only use these sprays on the infected plant, because they will also kill beneficial insects.  I have attached some links below to a similar Smarty Plants question and to a few websites that will help you determine what insect you are dealing with and what method of control will work best for you.  If these methods don't work, the plant is likely too stressed to ever do well, even if you were to use a more agressive pesticide that could harm other insects and the birds that you are trying to attract.  In that case, you may want to cut your losses and replace the diseased plant with a new, healthy specimen.  Happy bird-watching!

Control of sooty mold from aphids in Crape Myrtle

What's That Bug? - Aphids, Scale Insects, Leaf hoppers, and Tree hoppers

Texas Agricultural Extension Service - Scale insects on ornamental plants

Audubon - You have a choice!

 

More Diseases and Disorders Questions

Dead portions on oak tree in Hutchinson KS
August 22, 2011 - I have an oak tree on the property I just moved into. One tree is healthy, the other has a dead side or almost dead. It did have some new green leaves on the dead branches but not many. What should...
view the full question and answer

Swarming insects on non-native willow in Washington PA
September 25, 2011 - I have had a very large, beautiful pillow willow bush/tree growing next to our garage for about 8 years. Last year at the end of August, it began to attract white-faced hornets and yellow jackets by t...
view the full question and answer

Plant to repel snakes
September 23, 2008 - name of a plant or plants that repell snakes.
view the full question and answer

Bacterial spot in peach tree in McDade TX
February 05, 2009 - I have a Red Globe peach tree which was planted in February 2008. The local agricultural extension agent identified the tree as having Bacterial Spot in November 2008. They recommended copper hydrox...
view the full question and answer

Freeze damage to non-native Philodendron selloeum in Deltona FL
June 22, 2010 - My philodendrons selloeum died this past winter in the freeze,came back slowly this spring and now are suffering with very small deformed leaves. Some do grow but are getting large brown dry areas on ...
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