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

Sunday - August 22, 2010

From: Austin, TX
Region: Southwest
Topic: Diseases and Disorders
Title: Aphid infestation from hackberries in Austin
Answered by: Barbara Medford

QUESTION:

I've got 5 hackberry trees in my yard and they are all heavily infested with woolly aphids! I wouldn't usually mind, but the aphids are now all over my newly planted native plants. I've read up on treating the plants, but I figure it won't be of permanent use because the main source is untreated. What's the best way to treat my hackberries? They are pretty tall and personally spraying them w/a high-pressure hose is out of the question. Help!!!

ANSWER:

We are assuming you had the Celtis occidentalis (common hackberry) on your property when you moved  in because most people seem to look down their noses at these trees native to this area, drought resistant and sturdy.  Not only that, but hackberries are among the best food and shelter plants for wildlife; the fruit is relished by birds. From Bug Guide, we found these pictures of Woolly Aphids, not a pretty picture.

You are correct that spraying your tall trees would be a challenge, and the creatures will overwinter in the cracks of the bark on those trees. This University of California Integrated Pest Management website on Hackberry Woolly Aphids mentions several lines of treatment,  but, frankly, we don't think this is something an individual can handle. This article refers to another species of the genus Celtis, Celtis sinensis, Chinese hackberry, but we believe their suggestions for control would still be valid for the common hackberry. 

We hate to tell you this, but we think you may need professional help with the aphids in the trees. You can continue to treat your newly planted native plants, just to help them survive the onslaught. Soon, believe it or not, the leaves will be gone from the hackberries, and the spread of the aphids will stop, for the moment.  As the material we have referred you to says, the eggs of the aphids overwinter in the cracks of bark on the trees, and dormant treatments don't seem to be too effective. None the less, you are going to have to deal with the source, because they will be right back in the Spring. 

 

 

More Diseases and Disorders Questions

Problems with Live Oak in Boerne TX
April 24, 2011 - I had my large Live Oak trimmed last year. This spring there seems to be a problem with leaf growth. Most leaves are small in nature and appear to have been attacked possibly by bugs. Many of the bran...
view the full question and answer

Which plants are resistant to dog urine in Ashmore, IL??
May 21, 2012 - Which native plants are resistant to dogs urinating on them?
view the full question and answer

Root rot and transplant shock in Texas betony
July 13, 2006 - Texas betony is supposed to be drought resistant but also likes to be kept moist, but I have had trouble getting it established. These seem to be undemanding plants I have had entire stems dry up and...
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

Juniper-apple rust galls
April 24, 2010 - I have Red Cedar trees in my yard. I have just noticed something that looks like a reddish brown squid-like bloom about the size of a small orange. Is this normal or is it a fungus?
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