Lonoke County
 Agriculture
Podcast
May 30, 2008
Horseweed Control (1:23 minutes)
Audio/Video Script:
Susan Scott
County Extension Agent - Agriculture
Up until this year the central Arkansas area has seemed to dodge the
glyphosate tolerant horseweed bullet. I’m Susan Scott, County Extension Agent
with the University of Arkansas, Division of Agriculture.
The areas around
Lonoke tend to have more conventional tillage than many of the delta cotton
fields where horseweed was a significant problem. Tilled fields do not develop glyphosate tolerant horseweed as quickly as no-till fields do. However, fields
of all types are infested with scattered to heavy populations of horseweed. As
fields get planted our options of controlling horseweed are limited.
Horseweed control in corn is the easiest. Atrazine should take care of the
problem. However, dicamba is labeled for application in corn up to 36” tall.
Dicamba is the best herbicide used to control horseweed.
There are no early post options for horseweed control in cotton. Envoke is
the only labeled option and you will get weed suppression at best.
Firstrate is the only postemerge option in soybeans. Expect suppression only.
Control horseweed before planting your crop. Thorough tillage or 8 ounces of
Dicamba mixed with your glyphosate burndown is the most effective control
method. Adding a residual to the burndown will lengthen your weed free planting
window. Cotton and soybeans have a 21 and 14 day plantback restriction that
begins after one inch of rainfall.
We will just have to suppress the horseweed the best way we can this year and
be prepared to control it with our burdowns next year. For more questions
contact the Lonoke County Extension Office.
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