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

Friday - May 30, 2008

From: Austin, TX
Region: Southwest
Topic: Pests, Shrubs
Title: Sap drips from Sophora secundiflora
Answered by: Barbara Medford

QUESTION:

We have an old Mountain Laurel (sophora secundiflora) about 20 ft tall. It blooms pretty well and seems healthy. We are wondering why it drizzles a non-sticky sap in tiny drops. Hold out your hand and you think it's starting to rain. We hope it's a sign of good health, and we are very curious why the plant does this.

ANSWER:

That sounds an awful lot like aphids. Anyone who has ever had to park their car under a tree that has aphids can talk to you about the mess it makes. And every reference to Sophora secundiflora (Texas mountain-laurel) that we found said that it was not threatened by any serious pests and diseases. Don't you hate when they say that and you KNOW there is a problem?

Getting back to the possibility of aphids. The University of California Integrated Pest Management has an excellent website on aphids. In the article, you'll find ways to identify the presence of the little bugs, when they may be more or less numerous, and non-chemical ways to treat them without damaging the beneficial bugs that eat aphids. One note you will particularly appreciate is that aphids do not do well in very hot temperatures. So, since it looks like this is going to be a really hot summer, maybe that's a good thing.

We found another critter that targets Mountain laurel, but is not considered serious except in very young, new trees. The Maricopa (Arizona) County Extension Service has published an article on the Sophora worms, Uresiphita reversalis.

 

 

More Pests Questions

Problems with Shumard Oaks and Crepe Myrtle in Cooke Co. TX
September 07, 2013 - I have a Shumard Oak Tree that has been in the ground approx. ten years. It has done great, even passing up some of my older Shumards. In August it began to lose its leaves at an alarming rate. They a...
view the full question and answer

Chigger Control in Habiturf from Plano, TX
April 08, 2015 - We converted our back yard in Plano, Texas to Habiturf last spring/summer and have a nice lawn; however, for the first time since we have lived in this house for 32 years, the lawn was full of chigger...
view the full question and answer

Care of butternut trees (Juglans cinerea) with bumpy growths
June 12, 2007 - I have two small butternuts, around 3-4 feet. One has developed very 'bumpy' reddish growths on the leaves that are actually stunting their growth. What do you think it is and what can i do to sto...
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

Something eating holes in Texas Betony from Austin
June 06, 2012 - What pest is eating holes in the leaves of my Texas Betonys? They look healthy but almost all leaves have various sizes of round holes in them. What is the best cure for this? Thanks
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 | SITEMAP | STAFF
© 2016 Lady Bird Johnson Wildflower Center