Remember watching scary
movies as a kid, and whenever
the main character clobbered
the monster and got the better
of it, what happened? They always turned
to run away. What did the monster do?
It got right back up to terrorize some
more. It probably set in your mind that
if you ever find yourself knocking down
a zombie or alien being, just stand there
and keep beating it until you are sure it
will not get up again.
Now, consider that Palmer amaranth is that monster. Producers have knocked
it down using an integrated approach,
but now is not the time to let up or this
monster will come back with a vengeance.
Use All Available Methods
Eric Prostko, University of Georgia Extension
weed specialist, says that, in general,
producers have made significant improvements
in Palmer amaranth control
over the last few years. But he reminds
producers that it takes using every available
method to manage it.
“Do not rely on herbicides alone. Use
other available tactics when you can, such
as tillage, cover crops, planting in twin
rows and hand weeding,” he says. “Hand
weeding, especially, provides valuable benefits
in reducing the weed seed bank.”
Remember Resistance Management
Prostko says that herbicide programs
that include residuals such as Valor and/or
Dual Magnum and timely postemergence
applications of Gramoxone plus Storm,
Cadre, Cobra and/or Ultra Blazer have
provided the most consistent control of Palmer amaranth.
“Those fortunate enough to have irrigation
can make their residual herbicides
work much better.”
However, herbicide-resistant Palmer
amaranth has forced many producers to
rely more heavily on certain herbicides
such as Dual Magnum and Warrant.
“Additionally, a new herbicide, sold under
the trade name of Zidua, is now labeled
for use in field corn and will eventually
be labeled for use in soybean.
Unfortunately, all of these herbicides have
the same mode of action,” Prostko warns.
Producers must know the herbicide
modes of action being used in all crops on
the farm and rotate modes of action as
much as possible.
Aim To Start Clean
For Palmer amaranth, use:
The final point to remember just before
planting is that it is very important
to start clean.
“Usually, most problems with Palmer amaranth in a field can be traced back to
what was done at planting,” Prostko says.
“Do whatever you can at planting with
herbicides, tillage and all of your tools, to