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Palmer amaranth is only one normal season away from returning to haunt HoosiersPalmer amaranth is only one normal season away from returning to haunt Hoosiers

The killer weed from the South lay low last season, but expert looks for it to return.

Tom Bechman 1

January 18, 2016

2 Min Read

For the past three years Palmer amaranth has gotten lots of press in Indiana. It’s the hated weed that literally drove some farmers in the Deep South away from cotton and/or soybeans. Indiana farmers who have dealt with it understand why it’s a hated name in many places.

Last year, however, you didn’t hear a lot about Palmer amaranth in Indiana. There is more talk this winter about waterhemp, a relative of Palmer amaranth that while hard to handle in its own right, usually gets as large and grow out of control as quickly as the big weed from the South.


So did every farmer learn to identify Palmer and take it out weed by weed by hand? Or did every farmer learn how to control it through residual herbicides and not rely on post applications? Some farmers likely did both, but that’s not likely why it didn’t make a lot of noise last year.

“We think it has more to do with the wet season that we had last year,” says Bill Johnson, Purdue University Extension weed control specialist. “The season wasn’t conducive for Palmer plants to get a good start.”

It was also the wettest, with ponding and flooding rampant, in some of the counties in northwest Indiana which have experienced the most issues with Palmer amaranth so far. Some of those fields were nearly wiped out by water early in the season.

So have we heard the last of Palmer amaranth in Indiana? Hardly.

“If we have a drier growing season, which is more typical, it will be back,” Johnson expects. After all, this is the species that can produce several hundred thousands of seed per plant. And isolated plants can produce up to a million seeds. There are plenty of seed in the soil in areas where it is established, Johnson says.

That means he believes producers should stay on guard, and if they’ve had Palmer amaranth in the past, assume they will have it again, he says. Adopt a weed control system that can head it off, typically involving a residual herbicide.

Some farmers report good results using Liberty in Liberty Link soybeans. The key in any post program with Palmer is spraying when weeds are small, Johnson says. Once Palmer plants are four inches or taller, they are off to the races and very hard to control.

About the Author(s)

Tom Bechman 1

Editor, Indiana Prairie Farm

Tom Bechman is an important cog in the Farm Progress machinery. In addition to serving as editor of Indiana Prairie Farmer, Tom is nationally known for his coverage of Midwest agronomy, conservation, no-till farming, farm management, farm safety, high-tech farming and personal property tax relief. His byline appears monthly in many of the 18 state and regional farm magazines published by Farm Progress.

"I consider it my responsibility and opportunity as a farm magazine editor to supply useful information that will help today's farm families survive and thrive," the veteran editor says.

Tom graduated from Whiteland (Ind.) High School, earned his B.S. in animal science and agricultural education from Purdue University in 1975 and an M.S. in dairy nutrition two years later. He first joined the magazine as a field editor in 1981 after four years as a vocational agriculture teacher.

Tom enjoys interacting with farm families, university specialists and industry leaders, gathering and sifting through loads of information available in agriculture today. "Whenever I find a new idea or a new thought that could either improve someone's life or their income, I consider it a personal challenge to discover how to present it in the most useful form, " he says.

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