Native Plants

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.
Did you know you can access the Native Plant Information Network with your web-enabled smartphone?
Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

rate this answer

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
Plants for oak shade from Whitney TX
December 24, 2012 - I live in Whitney, Texas and have a number of beautiful Live Oak trees in a portion of my yard providing deep shade. Asian Jasmine grows in about 5 ft circle around them and then nothing! I have walk ...
view the full question and answer
What are the differences between Arbutus xalapensis, A. unedo and A. marina
August 29, 2013 - One nursery lists madrone trees as arbutus uneda compacta and arbutus marina. The other lists it as arbutus xalapensis, which is the only name I can find in the data base. There is a very large pric...
view the full question and answer
Need a drought resistant, maintenance free tree in Thomasville, GA.
April 20, 2012 - I have been through many tree forums and asked several nurseries about a good tree to plant but nobody has provided an adequate answer and I hope you can help. I live in SW Georgia (Zone 8) and need ...
view the full question and answer
Should Texas live oaks be mulched under drought conditions?
July 19, 2011 - Should we mulch our live oaks in pastures for water retention?
view the full question and answer
Non-native invasive carrot wood tree losing leaves in Alpine CA
April 22, 2014 - My carrot wood tree is losing all of its leaves. The tree is about 15foot high & 13 years old. Could it be gophers? The tree was trimmed 1 year ago.
view the full question and answer
Support the Wildflower Center by Donating Online or Becoming a Member today. |