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

Foundation plants for Albuquerque.
July 01, 2012 - Hello, I live in Albuquerque. I am looking for some native/xeric low water usage plants for foundation plants for my home. They will be foundation plants for a two story home that has a large ponde...
view the full question and answer

Failure to bud out of Shumard oaks in Floresville TX
April 16, 2010 - Question: I have a Shumard red oak (9-10ft tall) that I planted last October as its leaves were turning a brilliant red color. However, it's the only tree that did not bud this spring. I scraped t...
view the full question and answer

Leaf drop from live oaks in mid-summer
July 08, 2013 - We have a live oak that is starting to drop a considerable amount of leaves here in early July in Cypress Texas. Its a mature tree with a base diameter of 12-14" and 25-30' tall. We live in a subd...
view the full question and answer

Need help with a 50 ft Tulip Tree with storm damage in Brownsburg, IN.
June 30, 2010 - I have a 50 ft Tulip tree that suffered storm damage. One for the main branches split at the top fork and fell. It has left about 6 ft of exposed wood but there are still a couple of main branches in...
view the full question and answer

Identification of Cockspur Hawthorn as Crataegus crus-galli
September 05, 2006 - What is cockspur hawthorne?
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