En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Disease of eastern red cedars (Juniperus virginiana)

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

Sunday - August 01, 2010

From: St. Louis, MO
Region: Midwest
Topic: Trees
Title: Disease of eastern red cedars (Juniperus virginiana)
Answered by: Nan Hampton

QUESTION:

I have multiple Eastern Red Cedars spaced in my woods which are sick and dying. Some were transplanted years ago, others are volunteers, all are less than 4 ft tall. The foliage turns brown in various places throughout the plant top to bottom and this seems to spread without cause. On some branches it starts at the tips, other times not. There are no cysts, or growths and no visible fungus, mold or pests. I live in St. Louis, MO. This started in the spring and continues through the summer. They are not drought stressed. Do you know how to save my trees? Thanks.

ANSWER:

Our focus and expertise here at the Wildflower Center are with plants native to North America, but we aren't necessarily experts on their diseases and how to cure them.  We hope, however, we can point you in the right direction to find resources that can help you with your Juniperus virginiana (eastern redcedar) problems.  There are several diseases that are listed as common to the junipers, but the three with symptoms that sound most like that of your trees are:

1) the Phomopsis and Kabatina Tip Blights of Junipers caused by the two fungi Phomopsis juniperova and Kabatina juniperi.  This article lists control measures including watering, fertilizing and pruning advice, as well as methods for chemical control.  Here is more information on Phomopsis blight and on Kabatina tip blight.

2) the fungus Pseudocercospora juniperi (syn. Cercospora sequoiae var. juniperi) that causes Cercospora Blight of Juniper.  The Juniperus scopulorum (Rocky Mountain juniper) is most susceptible.  Although Eastern Red Cedar is resistant to this disease, it does occasionally occur on it.  Here is more information on the Cercospora blight.

Of course, the best way to be sure if one of these is infecting your trees is to contact a professional arborist to look at them.  You might also contact your St. Louis County MU Extension Center to see if they have had other reports of diseased junipers.


 

 

More Trees Questions

Will non-native and invasive Mexican petunias grow under oak trees from St. Augustine FL
March 24, 2013 - Will Mexican Petunias grow under an Oak tree?
view the full question and answer

Cherry trees in the North Texas area
April 21, 2009 - Will cherry trees grow well in the North Texas area?
view the full question and answer

Why is my Chinkapin oak losing its leaves this spring?
June 02, 2009 - We have a chinkapin oak that was planted about two years ago in our front yard. This year it leafed out nicely but about a month ago the leaves began to roll up, then dry out and fall off. It seems ...
view the full question and answer

Difficulty of watering at drip line of trees from The Woodlands TX
August 18, 2011 - I'm watering my couple dozen native mature trees to make sure they survive this drought and its aftermath..and I'm reading about how to water at the drip line. But..all of my trees' drip lines ext...
view the full question and answer

Trees with non-invasive roots or tops in Newhall CA
November 07, 2011 - We would like to plant a tree with noninvasive roots near our garden wall and concrete driveway in a grassy area in the front yard facing west. This spot is very sunny in the afternoon with automatic ...
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