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

Tuesday - May 27, 2014

From: Austin, TX
Region: Southwest
Topic: Pests
Title: Infestation of shiny red and blue/black beetles
Answered by: Nan Hampton and Valerie Bugh

QUESTION:

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 insecticidal soap, I want to make sure that they are not beneficial. Thank you.

ANSWER:

Mr Smarty Plants consulted with an entomologist, Valerie Bugh, to give you the best answer to your potential pest problem.  She said:

"Without knowing the host plant, location, or seeing a photo, this could be a description of a number of true bugs or beetles. Since the term "infestation" usually means a large number of individuals, there is an excellent chance that the insects are NOT predatory but herbivorous. One exception: some predatory stink bugs, which can be black/red, prefer to remain in groups. If the plant is a personal favorite and is declining in health, then it would make a gardener feel better to kill off the insects."

However, knowing that you live in the Central Texas area she thought that this might be Asphaera lustrans, a flea beetle that likes salvias, among other things. They may sometimes be rather numerous but never seem to do much damage.  Here is another photo and information from Nature Search.

 

More Pests Questions

Replacement for non-native Italian Cypress in Austin
July 10, 2011 - I would appreciate your assistance with some native plant options to replace Italian Cypress trees in the Arboretum area of Austin, TX. I have 12 of the trees on the north side of the house to obstru...
view the full question and answer

Perennial plants resistant to cutter ants in Aransas Pass, TX
January 12, 2010 - We are moving to Aransas Pass, Texas. Are there any perennial plants resistant to cutter ants?
view the full question and answer

Purple sage with black residue on leaves in Georgetown TX
October 02, 2009 - I have 2 very healthy tx. purple sage that have developed a black residue on some leaves, and is a "sticky" substance..any ideas what this is and how to treat???
view the full question and answer

Problem with leaf cutting bees in Houston, TX
December 08, 2014 - I have four Arapaho crepe myrtle trees in my backyard and two have leaves, especially the young leaves, being eaten by something. I do not see ants of beetles on the leaves and have not seen any bees ...
view the full question and answer

Effects of salt sprinkled on garden
June 29, 2006 - The kids accidentally sprinkled salt on the plants in the garden. How do you counter the effect of the salt so the plants will not die. I would appreciate your response. Thank 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