[University of Arkansas Division of Agriculture Research and Extension
University of Arkansas System. Arkansas Soybean Promotion Board. Dr. Bob Scott,
Extension Weed Specialist, Crop, Soil and Environmental Science, Lonoke Research
and Extension Center, University of Arkansas Division of Agriculture, Lonoke
Research and Extension Center]
I’m Bob Scott with the Cooperative Extension
Service Division of Agriculture. [Bob Scott standing in a corn field.]
Corn is an excellent rotational crop with
soybeans and cotton, especially if you’ve got Palmer pigweed. In corn, we can
use products such as Atrazine, Halex™ GT, which contains several modes of action
that aren’t available in cotton and soybeans for the control of pigweed.
It’s important to remember in your rotational
crops like corn to watch for late emerging weeds in the corn canopy. As corn
begins to mature in the fall, the canopy opens up, the sun is allowed to hit the
ground and we have a re-emergence of many troublesome weeds. Often these include
Palmer pigweed, morning glories and grasses. [Video shows weeds between
corn rows.]
Oftentimes in the fall, it’s very beneficial to
follow corn harvest with a herbicide application to prevent these late
germinating weeds from going to seed. There are a limited number of products
available especially considering what you want to do with the field the
following year. [Video shows a harvested corn field with weeds.]
Paraquat or Gramoxone® is a commonly used product
following corn harvest to eliminate pigweed. [Picture of a bottle of Gramoxone®
SL.] If you are planning on planting
wheat, you may want to consider including a residual such as Valor Valor® can be
applied 30 days prior to planting wheat.
In addition to Valor®, Dual® is an option
if you’re not going to plant wheat. [Slide - Valor® Herbicide.] Dual® can be used in combination with Gramoxone® following corn harvest to prevent the germination of pigweed seed
until we have a killing frost. [Video shows a harvested corn field with
weeds. Slide - Dual®.]
[Bob Scott standing in a corn field.] For more information about pigweed control,
consult the MP44 at
www.uaex.edu.
[Find information in the MP 44 found at
www.uaex.edu.
University of Arkansas Division of Agriculture Research and Extension University
of Arkansas System. Arkansas Soybean Promotion Board]
University of Arkansas • Division of Agriculture
Cooperative Extension Service
2301 South University Avenue
Little Rock, Arkansas 72204 • USA
Phone (501) 671-2000 • Fax (501) 671-2209
