En Espa—ol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Will corn fall victim to allelopathy from hackberry in Clarkridge AR

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
Not Yet Rated

Saturday - March 30, 2013

From: Clarkridge, AR
Region: Southeast
Topic: Non-Natives, Edible Plants, Trees
Title: Will corn fall victim to allelopathy from hackberry in Clarkridge AR
Answered by: Barbara Medford

QUESTION:

Will my corn be inhibited by a nearby hackberry and if so would it help to cut it down? I understand that sometimes the soil is full of the chemicals the tree produces.

ANSWER:

What you are probably referring to is allelopathy, which is the production of chemicals in some plants that inhibit growth in competing plants nearby. This article from Cornell University includes this statement:

"One of the most famous allelopathic plants is Black Walnut (Juglans nigra).  The chemical responsible for the toxicity in Black Walnut is Juglone (5 hydroxy-1,4 napthoquinone) and is a respiration inhibitor.  Solanaceous plants, such as tomato, pepper, and eggplant, are especially susceptible to Juglone.  These plants, when exposed to the allelotoxin, exhibit symptoms such as wilting, chlorosis (foliar yellowing), and eventually death.  Other plants may also exhibit varying degrees of susceptibility and some have no noticeable effects at all.  Some plants that have been observed to be tolerant of Juglone include lima bean, beets, carrot, corn, cherry, black raspberry, catalpa, Virginia creeper, violets, and many others."

Black walnut isn't the only tree that produces juglone. This chemical is also secreted in smaller amounts by English walnut, hickory and pecan trees.Other trees with allelopathic properties include tree-of-heaven, sugar maple, hackberry, American sycamore, American elm, southern wax myrtle, cottonwood, black cherry, sassafras, red oak and black locust.

So, we know about Black Walnut not being a threat to your corn, now to find out if Celtis laevigata (Sugar hackberry), which is a member of the Ulmaceae (elm) family, could exibit allelopathy. We found this list of pests in corn:

Frankly, we think any of them would be worse than a nearby hackberry. Since the center of origin of  Zea mays (corn) is believed to be native to Mexico or Central America, we don't know  too much about it. If your (native) hackberry is shading the corn, you might want to think about it, but otherwise, we feel the corn is safe.

 

From the Image Gallery


Sugar hackberry
Celtis laevigata

More Trees Questions

Trees to replace ones lost in Westchester County, NY
May 09, 2013 - We lost a large number of trees in the forest adjacent to our home, and I plan to replant them. What species do you recommend to plant the area with natives and to keep it looking "natural."
view the full question and answer

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

Planting Mountain Laurel grown from seeds in Argentina
April 09, 2014 - Hello, I was transferred to Cordoba, Argentina 2 years ago from San Antonio, the climate hereis similar to S. TX, anyway I brought some mountain laurel seeds with me and they have been in 2 gallon pot...
view the full question and answer

Desert Willow and Orchid tree with no upper leaves from Kerrville TX
May 30, 2013 - I have two 5 year old Desert Willows planted in my yard. This year only one has leaved out and blooming. The other is bare but the branches are not dead and it has new growth at the bottom. Do you kno...
view the full question and answer

Suckers from Oak Tree Roots in Austin
May 17, 2013 - Hi. I am a home owner in Austin TX with several live oak trees. We love them and want to keep them healthy. We have a nice landscape in the back yard and Iím wondering if you can answer a quest...
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