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

Looking for copper beach (Fagus sylvatica)
December 05, 2008 - I would like to purchase a copper beech tree to plant in CT as a gift. Where can I find one to purchase?
view the full question and answer

Transplanting a redbud in Boerne TX
August 29, 2012 - Hi there, My question is when is it safe to transplant a native tree? I have a redbud tree come up in m flower bed I want to try to transplant it instead of cutting it out. It is very young - maybe 4-...
view the full question and answer

Large ash tree with round white spot on bark
July 21, 2008 - I have a large ash tree that seems to be fairly healthy. However, it has a large round white spot (about 18" diameter) on the bark, about 3' up from the base. Within the solid white circle the bark ...
view the full question and answer

Allowing oak leaves to pile up at base of tree from San Jose CA
December 26, 2010 - Greetings, Is it a good idea to allow oak leaves to pile up at the base of our California live oak? Will that cause fungus, mold and rot that hurts the tree? Thanks for your advice.
view the full question and answer

Newly planted magnolia in Hedron NE
September 19, 2010 - We planted a Magnolia stellata 'Royal Star' in our landscape about 2 weeks ago. It is approx 7' tall. My question is should the leaves on it all be turning brown and crisp already or are doing some...
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