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

Plants to filter dust from a road in MD
June 01, 2011 - I live in MD next to a dirt/gravel access road. I would like to plant something along my property line to block the clouds of dust we regularly get from cars and dirt bikes. Is there something fast ...
view the full question and answer

Growth rate of mesquite (Prosopis glandulosa)
August 16, 2009 - What is the growth rate of Mesquite? How long does it take for Mesquite to achieve a 4-6 inch wide trunk? I can't seem to find this information.
view the full question and answer

Has Texas Black Persimmon been crossed with non-native persimmons from Austin
August 17, 2013 - Hi. I just found a Texas Black Persimmon in my neighborhood. The fruit is olive green and then black, then it explodes into a black slurry of seeds and syrup. The color is so strong I find myself wond...
view the full question and answer

Landscaping a Fence with Native Plants for Central Texas
March 08, 2013 - I'm looking to landscape my fence that I've lined with woven bamboo. The area gets the hot afternoon sun in summer and is pretty shady in winter. The plants need to be drought and heat tolerant. I'...
view the full question and answer

A tap-rooted tree for Munroe Falls, OH?
August 16, 2012 - Hello.. We need to find a fast growing shade tree which has a tap root or a heart root system. No surface roots please. We live in Munroe Falls, Ohio which I believe is Zone 5. Let us know your though...
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