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

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

Diseased non-native red tip photinias from Richmond VA
April 08, 2014 - Our red tip trees have a while substance on the bark at the base of each tree..look like some kind of fungus or mold, but we don't know how to get rid of it. Please help.
view the full question and answer

Failure to flourish of Trumpet Creeper in Leesburg VA
June 28, 2011 - Dear Mr. Smarty Plants: Late last year I planted a trumpet creeper vine to grow on my fence and attract hummingbirds. It gets full sun, is in average soil and gets adequate water. I put a few daylilli...
view the full question and answer

Laurel oak tree not leafing out in Pasadena TX
April 13, 2010 - Hurricane Ike blew down our red bud in the backyard. Had a large 25' laurel oak planted early March 2010. When it was put in the ground, the leaves were on it, but they were all brown and dried. T...
view the full question and answer

Moth using Agarita as its larval food in New Braunfels, TX
March 27, 2009 - What moth uses agarita as its larval food? It is a perennial problem that can nearly defoliate the specimen and severely limit its flower production.
view the full question and answer

What kind of beetles are attacking cedar trees on Cape Cod, MA.
May 17, 2010 - I live on Cape Cod, MA and my cedar trees are being attacked by some kind of beetle & killing them. I would appreciate knowing what this could be and how to treat this. Thank you
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 | STAFF
© 2015 Lady Bird Johnson Wildflower Center