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

Monday - August 08, 2011

From: Austin, TX
Region: Southwest
Topic: Diseases and Disorders, Trees
Title: Are Ashe Junipers dying from mite damage in Austin?
Answered by: Barbara Medford

QUESTION:

If Ashe Juniper needles are turning brown and dropping off the trees because of drought, and not disease, do the needles ever come back, or have the tree limbs died? What if the cause is mites, not drought? If the needles will come back, how do you tell if a limb is dead, and not just temporarily bare?

ANSWER:

We have been hearing from all over North America on the subject of members of the Conifer family, including Ashe Juniper, suffering from mite damage. Here is a previous answer that pretty well sums up what we know about this problem, with associated links.

Various Problems of Ashe Juniper

In terms of whether the needles will come back or is the branch dead, we can't be sure. The needles that dropped off have done so because of the heat and drought. If the branch survives, they will put on new needles, because they are the "leaves" of the juniper and are needed to provide nutrition to the plant. If you want to determine if a branch is dead, try the thumbnail test. Scratch a very small sliver off the branch with your thumbnail. If there is a thin layer of green beneath that out covering, that branch is still alive.

The mites are actually taking advantage of the stressed tree. If the tree were not suffering so much they would replace the needles lost to the mites, and you wouldn't notice the damage. It would appear that the best thing we can do is wait for rain. If you have just one tree and you are concerned that it has mites, you can turn a hard spray of water on it, which will wash the mites off. They will come back, but not so quickly. If you have 30 acres of junipers, this is hardly practical; again we have to let Nature take its course.

We would advise waiting until the weather has cooled and (hopefully!) there is some rain before you make any decisions about trimming dead limbs.

 

 

 

From the Image Gallery


Ashe juniper
Juniperus ashei

Ashe juniper
Juniperus ashei

Ashe juniper
Juniperus ashei

More Trees Questions

Ashe Juniper not doing well in San Antonio
April 08, 2010 - A large ash juniper (mountain cedar) in my yard appears to be sick or dying. Approximately 1/4 of the canopy has very sparse needles/green foliage stuff and shaggier than normal bark. It's not brown ...
view the full question and answer

Oak Bark Loss in Arlington, TX
May 04, 2013 - I have multiple oak trees in my yard (in north texas) that have begun to lose their bark in small chunks. I'm in the middle of the city so their are no deer and yes it's been a dry 2 years but this...
view the full question and answer

Need help controling suckers from an ornamental plum in San Pedro, CA.
August 10, 2010 - I have an ornamental plum tree in my garden which produces a lot of suckers in my vegetable beds. I do not want to use harmful chemicals and cutting them back is a hopeless venture and leaves small...
view the full question and answer

Sappy dew killing plants under oaks in Missouri
September 19, 2008 - There is a sappy dew killing my perennials.I have several large oaks in my yard. I had different kinds of shade perennials around each base of the trees. But as years have gone by, the different varie...
view the full question and answer

Lemon cypress Goldcrest in Richland MI
September 15, 2009 - Can the shrub lemon cypress survive a southern Michigan winter? If so, how does one care for it?
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