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
4 ratings

Thursday - August 31, 2006

From: Helotes, TX
Region: Southwest
Topic: Trees
Title: Possible wilt disease in mountain laurels
Answered by: Joe Marcus

QUESTION:

Three of about 24 of my mature mountain laurels died suddenly, the leaves turned brown almost overnight, scratching the bark revealed no green tissue, the small branches practically cracked when bent, the leaves went from green and healthy to dry and brown in about three to four days, the plant seemed to have just dried up. I do not believe they were over or under irrigated as other healthy mountain laurels remain immediatly adjacent to the dead ones. I detected no caterpillar damage. Any ideas what happened?

ANSWER:

Texas Mountain Laurel, Sophora secundiflora is famously resistant to most pests and diseases; the one major exception being the Genista caterpillar which attacks the leaves. However, the phenomena you described are pretty classic symptoms of a wilt disease. Wilts are usually caused by fungal pathogens invading and clogging vascular tissue in roots or stems of plants, thus the sudden decline of the plant. Species of fungi within the genera Verticillium and Fusarium would be the most likely cause of the disease, but Texas Mountain Laurel is not known to be particularly susceptible to any of them.

There are other possibilities, but without actually examining the plants, it would be difficult to rule any cause either in or out. You should contact your county agricultural extension agent for information on having samples from your dead plants tested to determine the cause of the problem.
 

More Trees Questions

Native plants for Pflugerville, TX in blackland soil
March 21, 2008 - Mr. S-P, I'm perusing the plant sale list for a couple of tall shrubs to plant on the sunny southwest side of my house, in Blackland soil. It is generally dry there because of the sun, but can ge...
view the full question and answer

Need a tree to replace a large oak tree that may be dying in Bedias TX.
April 28, 2011 - I live in Bedias, TX in Grimes County. One of the largest oak trees on my property looks like it's dying. It's simply not leafing out well. I literally can't afford for this to happen since I depen...
view the full question and answer

White flowers to plant in front of evergreen tree screen in Altoona PA
June 15, 2010 - I have planted about 30 evergreen trees (as a screen). I would like to plant a row of low maintenance whitish flowering bushes or low maintenance large flowering plants in front of this row. Any sug...
view the full question and answer

Opinion of 5 best native garden plants in Oklahoma from Burneyville OK
September 07, 2013 - What would you say are the 3 to 5 BEST native garden plants for south central Oklahoma?
view the full question and answer

Fast growing shade tree for East Texas Piney Woods
April 11, 2013 - What is the fastest growing shade tree for E.Tx.Piney Woods? We have an area that desperately needs protection from the summer heat. The site is comprised of gumbo clay and there are no other plants t...
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