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

Thursday - April 14, 2011

From: Austin, TX
Region: Southwest
Topic: Trees
Title: Insects along branches of cedar elm
Answered by: Nan Hampton and Eric Beckers

QUESTION:

I have a 10 foot Cedar Elm planted three years ago. The smaller branches have what looks like incubating red pellet-like insects in a soft, putty colored glob--one insect per glob. They are all along the branches. It looks as if those branches will not leaf out although uninfested ones are doing so. Are these insects causing permanent damage and can/should I do anything to get rid of them? Thank you.

ANSWER:

I contacted Eric Beckers with the Texas Forest Service who agrees that your description sounds like lecanium scale insects.  University of California Integrated Pest Management (IPM) has a list of many scale insects (with links to photos of most) and their hosts.  Horticultural oil is a good treatment but it should have been applied in their overwintering stage to be most effective.   You can still do a summer weight oil application but you need to be very careful to avoid the new foliage when applying it.  Other possibilities for treatment are listed in the two links (above) about scales.  Eric reminds you that it is very important to maintain adequate moisture on those easily stressed new trees. 

 

More Trees Questions

Source for Ashe Juniper seeds from Blanco Co., TX
March 10, 2014 - I'm trying to find Ashe Juniper seeds to plant in bare areas of my property in central Texas. I understand they grow well in rockier soil and have many other benefits for native animal species. Unfo...
view the full question and answer

Identification of tree with outrageous thorns
August 10, 2014 - Can you identify this tree? It has these outrageous thorns on its trunk. They are in clusters and are anywhere from 1" long to 4" long or so.
view the full question and answer

Daily water absorption of live oak from soil
December 04, 2003 - How much water does the live oak absorb from the soil per day?
view the full question and answer

Is a Mexican plum planted last Spring in Houston ready to bloom
April 08, 2011 - I live in Houston, TX. I bought my Mexican Plum last late Spring. It was about 4' tall. It is now about 6' tall, very healthy with lots of beautiful leaves. It gets a lot of sun. It did not blo...
view the full question and answer

Live Oak Leaf Drop in North Carolina
April 27, 2011 - We planted a 15 foot, approx. 3" caliber live oak tree last summer and it seemed very healthy throughout our unusually cold winter in the Piedmont area of North Carolina. (Winston-Salem). Now it's ...
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