From:Helotes, TX Region: Southwest Topic: Trees Title: Possible wilt disease in mountain laurels Answered by: Joe Marcus
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?
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
Trees for shade in Austin May 20, 2012 - I live in Austin and I am looking for a good tree to plant under a large live oak I have in my backyard. Something slow-growing of course and, the garden only gets late day sun for about an hour. Filt... 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
Live oak wobbling in the ground from Austin May 02, 2012 - I have a live oak that was not planted firmly in the ground by the subdivision builder's landscapers. The entire tree is wobbly to the touch and it has come close to dying as result of windy condit... view the full question and answer
Transplanting Trees in OH May 10, 2012 - Is the middle of May too late to dig out Arborviteas and spruces to transplant? I live in central Ohio. view the full question and answer
Trees for privacy and filtering dust in NY March 23, 2011 - I live on a very busy, DUSTY, dirt road in Putnam County NY. (zip code 10524) What is the best, fast growing evergreen that I can use for dust control and privacy? I would prefer something that requi... view the full question and answer