En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Esperanza with rust spots in Corpus Christi, TX

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
1 rating

Monday - November 30, 2009

From: Corpus Christi, TX
Region: Southwest
Topic: Compost and Mulch, Diseases and Disorders
Title: Esperanza with rust spots in Corpus Christi, TX
Answered by: Barbara Medford

QUESTION:

I have a young esperanza plant and the leaves have what looks like rust spots all over them. What is the cause of this and what can I do for it? My other larger and older esperanza does not have this.

ANSWER:

Without being able to actually see your plant, about all we can do is give you some questions to ask yourself about the location, soil and age of your Tecoma stans (yellow trumpetbush). 

We always begin by looking for pests and diseases that might commonly cause a problem and found, as so often happens, that just about every resource we looked at said this plant was resistant to pests and diseases, had none or was seldom bothered. A nice way of saying they didn't know, either. This University of Florida IFAS Extension website gives more complete information on the culture of the plant. There is always the possibility of whiteflies, aphids or scale defacing the leaves, but none of them are major concerns. And check the sun exposure: this plant requires full sun (6 hours or more of sun daily) or part shade (2 to 6 hours daily). 

We know we sound like a broken record, but the weather the last two years has been very unforgiving, heat and drought taking its toll on even hardy desert plants, which Esperanza is. You say your older plant is not showing these signs, which makes us wonder when you planted the newer one. If it was planted during the heat and drought we were still having up until mid-October, it could very well be suffering from transplant shock. In fact, research shows that plants can suffer transplant shock for up to 5 years after the original planting. Even a desert plant will need supplemental watering when there has not been sufficient rainfall, and the Esperanza particularly needs good drainage; that is to say, no water standing on the roots after it finally gets some rain, or even from a sprinkler system. 

Your plant is about to go into dormancy anyway. In Corpus Christi, it probably won't get cold enough to cause the plant to die back to the ground, but a good trimming back in early Spring will not only initiate more vigorous growth and blooming, but is also the treatment we usually recommend for transplant shock. Be sure and check the drainage; working some compost into the dirt around the roots and mulching the roots to add more heat and cold protection will also help.


Tecoma stans

Tecoma stans

Tecoma stans

 

 

 

More Diseases and Disorders Questions

Pruning mature cedar elm trees in San Antonio
September 14, 2008 - When is the right time to prune my several mature cedar elm trees? I'm in San Antonio, and they have never been trimmed in the 55 years we have lived in this home. I have several that are at least 7...
view the full question and answer

Mountain Laurel having trouble in AZ
June 07, 2011 - A Sophora secundflora (Texas mountain laurel) was planted to an Arizona north faced front yard last year in August under full sun. Starting early this year, I noticed its leaves turn to light green an...
view the full question and answer

Webs on tree trunk, probably bark lice
August 19, 2009 - webs on tree trunk and creeping up. See no spiders or worms. what could be. very fine, thick web
view the full question and answer

Mosquito repellent plant?
September 01, 2008 - I would like to know if there is a plant that keeps mosquitoes away. Thanks
view the full question and answer

Possible mildew on standing cypress
May 29, 2008 - My mother-in-law took some standing cypress seeds from Texas to Virginia several years ago. They have always done very well, but this year they are growing very tall, but the bottom half of the stalk...
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