En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Chlorosis in sycamore in Kyle 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
3 ratings

Thursday - August 04, 2011

From: Kyle, TX
Region: Southwest
Topic: Compost and Mulch, Diseases and Disorders, Trees
Title: Chlorosis in sycamore in Kyle TX
Answered by: Barbara Medford

QUESTION:

I'm trying to assist an elderly neighbor of mine with a plant issue. We have designated street trees in this community, our street being a Sycamore. The previous foreman out here called it a Mexican Sycamore. My neighbor's is almost completely yellow and has been this way for months. The bark looks good. There are visible new buds/growth along the limbs. However, most of the leaves are yellow, many with spotting throughout that looks rust colored. I've done some research on the internet and the issues that come up with more frequency are a deficiency in either iron or nitrogen. If this is the case, I was considering a two-staged response consisting of a liquid fertilizer for initial treatment, along with something like Miracle Gro tree spikes for long-term. Any comments/input that you might have would be appreciated.

ANSWER:

We found an article on Chlorosis in Trees and Shrubs from Washington State University from which we extracted this paragraph that sounds like the symptoms you are reporting:

"Plants with iron chlorosis first turn yellow-green to yellow between the veins, with the veins remaining a darker green. With more severe chorosis the leaves  become pale yellow and develop brown spots between the main veins. Leaf margins may also turn brown with the leaves later drying up and falling off. Tree growth slows to a stop and dieback of branches can occur when iron chlorosis is extremely severe."

You have found good information in your research; however, we feel that the biggest problem causing chlorosis, especially in trees, is our highly alkaline soil in Central Texas. Here is a previous Mr. Smarty Plants question and answer on that particular problem. The previous question is concerning a different woody plant, but the principles are the same. Our take on all this is that not only is our soil alkaline, but has a lot of clay, which severely limits proper drainage around the roots.

This USDA Plant Profile Map shows that Platanus occidentalis (American sycamore) is native to this area, so you would expect it to be somewhat tolerant of our soils. In the Growing Conditions on this tree (please read all of our webpage by following the above plant link) this comment appears on preferred soil: "Soil Description: Moist, sandy loams or silty clays."  While your ideas on nutrient supplements are good, the basic problems of alkalinity and clay soil, which drains very poorly, still remain. Adding amendments to the soil when the tree roots are unable to access them is not going to be worth the time and expense.

Here is one more article on Iron Chlorosis, which discusses some treatments that are pretty extreme, and probably can't be attempted by a home gardener. One thing we observed from our research is that the sycamore is a moist soil tree, most often occurring naturally in riverbeds and forest areas. With our extreme heat and drought this year, all trees are somewhat stressed. We recommend you begin with attempting to get more moisture to the roots, sprinkling out some distance from the trunk, as the roots are farther out in the soil than the dripline of the tree. Second, try mulching the roots with a good-quality shredded bark mulch. This will help keep moisture in, cool the roots and, as it decomposes, improve the texture of the soil in terms of better drainage.

It is very difficult to address poor drainage in a mature tree, so taking some short-term measures to help the tree survive is advisable. Then, hopefully gradual additions of compost and/or mulch to improve drainage will improve the life expectancy of the tree. If you wish to try injecting some iron and manganese in the soil this may help in the long run as the soil improves and allows the roots to access those elements.

 

 

From the Image Gallery


American sycamore
Platanus occidentalis

More Trees Questions

Watering practices for live oaks in drought from New Braunfels TX
September 04, 2011 - We have conflicting info about watering live oaks. An arborist says to water now using soaker hoses or small sprinklers and a landscaper who spoke to our garden club said that after August is too late...
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

Disappearing oranges from Satsuma orange in Austin
June 25, 2008 - I had many tiny future oranges on my Satsuma Orange Tree until a few days ago. Suddenly, all were gone except one. They weren't on the ground and the tree itself seems incredibly healthy. It is gr...
view the full question and answer

Native plants for city lot in Longview, TX
March 19, 2008 - Just bought a city lot in Longview, TX and want to put in some plants at the periphery even before the house is built. Can you recommend any that would be from your list of East TX plants that are pa...
view the full question and answer

Care of butternut trees (Juglans cinerea) with bumpy growths
June 12, 2007 - I have two small butternuts, around 3-4 feet. One has developed very 'bumpy' reddish growths on the leaves that are actually stunting their growth. What do you think it is and what can i do to sto...
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