En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Orange patches circling cedar branches

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

Saturday - May 15, 2010

From: Corsicana, TX
Region: Southwest
Topic: Diseases and Disorders
Title: Orange patches circling cedar branches
Answered by: Nan Hampton and Eric Beckers

QUESTION:

We have dry rusty orange patches that circle several of our Cedar branches. There are a few orange blobs on different limbs, but they do not look like the pictures of Cedar Rust (no horns). The foliage is turning orange on these trees, as well. Do you know what this could be? Also, is Oak Wilt limited to certain areas, or are Oaks at risk in all areas of Texas?

ANSWER:

You may have stumped us! First of all, we aren't sure which cedar you might have.  Is it Juniperus ashei (Ashe's juniper) or Juniperus virginiana (eastern redcedar)?  Actually, that probably doesn't really matter because any juniper disease would most likely affect either one.  I spent a good bit of time looking for a likely candidate for your cedar infestation with no success.  I then passed the problem on to Eric Beckers of the Texas Forest Service and he confirmed that, if it's not cedar apple rust, this is a tough one.  He says that if the gall has dried up it won't show the "horns" or bright orange soft tendrils.  He suggested that you send us photos of the orange blobs and the the dying needles on the tree. Please visit Mr. Smarty Plants' Plant Identification page to read instructions for submitting photos.

There are several species of the fungus (Gymnosporangium sp.) that cause cedar rust.  You can see images of some of these at the Forestry Images site from the USDA Forest Service (scroll down the page to find Gymnosporangium).  The Plant Clinic site from Cornell University also has good images as well as some management strategies.

Now for the oak wilt part of your question, you can see maps showing the occurrence of oak wilt in Texas on the Texas Oak Wilt Information Partnership page.  The majority of the occurrences are in the central part of Texas from just below the Red River at the Oklahoma border to a line north of a Wimberley to Kyle line.  There are some scattered occurrences in west Texas.  Unfortunately, Navarro County is shown adjacent to counties that show oak wilt on these maps that are several years old.

 

More Diseases and Disorders Questions

Problems with Mountain Laurel in Leander TX
June 15, 2009 - My 13 yr old Mountain Laurel tree is sick. It has lost most of its leaves after blooming this spring. The twigs seem to still be pliable so I assume alive. I saw no moth worms or bags this year, ju...
view the full question and answer

Yaupon in bonsai failing to thrive in Lufkin TX
July 16, 2009 - Hi,I have a yaupon that I've turned into a bonsai. It's been producing new vegetation until about a month ago. Then all of a sudden the branches started drooping and the leaf tips started turning bl...
view the full question and answer

How do you stop the bark from peeling off the tree in Amarillo?
May 07, 2012 - How do you stop the bark from peeling off the tree? I live in Amarillo, TX. If you can't stop the progression, how do you keep the tree alive?
view the full question and answer

Problems with non-native zucchini in Muskogee, OK
July 23, 2011 - In the awful heat of this summer I am still getting zucchini to produce. But, once it grows about 3 inches, it gets yellow on the ends and dies. Am I watering it too much? (I have sprayed for bugs ...
view the full question and answer

Distressed Red Oak tree in Pflugerville, TX.
July 22, 2012 - I have a large (40 ft) Red Oak tree in my yard that is distressed. It started with yellowing leaves, with darker veins. Then small brown spots appeared, followed by browning arount the leaves edges. N...
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