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

Why are my potted Prunus caroliniana plants shedding leaves in LA, CA?
May 02, 2011 - I bought Prunus caroliniana in pots to use as privacy fence on my balcony. Have had them for about 6 weeks and they are shedding a lot of leaves. Some leave are drying out and others have what ...
view the full question and answer

Questioning native status of Alberta Spruce in New Jersey
November 11, 2005 - I am in the process of transforming my yard to native plants. Several years ago I planted a Dwarf Alberta Spruce. I want to be sure this isn't native before I remove it but haven't been able to fi...
view the full question and answer

Poolside tree for Whitehouse TX
May 29, 2012 - What would you recommend for native shade tree or flowering tree on the north side of a swimming pool in East Texas/Smith County? Trying to avoid too much dropping of flowers, nuts, etc. Looking to ...
view the full question and answer

Xeric landscaping walls in Mansfield TX
November 15, 2009 - We have two stone, concave 10 ft. high entry walls to our private street. These are each 20 ft. in length and face the west. What xeriscaping accent plants would you recommend. Also, should we crea...
view the full question and answer

Problems with post oaks in Milam Co., TX
October 26, 2009 - I have an old ranch in Milam County, Texas on the Brazos River with several large, old Post Oaks. Recently a few of these grand old trees have lost large branches and two have died. One has died, poss...
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