En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Possible wilt disease in mountain laurels

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

Fast-growing "climbing" tree.
February 12, 2009 - I live in Northern Virginia. My children would love for me to plant a "climbing" tree - short trunk, nice spread of limbs. Can you recommend a tree that could grow to meet this requirement in abou...
view the full question and answer

Determination of the sex of Mexican persimmon (Diospyros texana)
January 30, 2008 - Last spring, I planted a persimmon fruit from a Mexican Persimmon. I now have 6 small seedlings coming up. Since they all came from the same seed source - 1 black persimmon, will they all be male tree...
view the full question and answer

Plantings for a slope from New Carrollton MD
June 27, 2012 - My house (Maryland, near DC) sits at the bottom of a south facing slope. The soil is very heavy clay. The grade is about 1:20 for about 100 feet (with a steeper part at the top). Part of the hill is i...
view the full question and answer

Are hackberries harmful to other trees?
March 25, 2009 - A neighbor warned me that a hackberry tree that naturally sprouted up recently will harm the roots of other trees nearby and that it is such a bad tree we should take it down before it gets too big. I...
view the full question and answer

Blooms on Desert Willow withering quickly in Rockwall TX
July 15, 2010 - Why do the blooms on my Desert Willow dry up and wither away in one or two days?
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