Scout new CREP areas now for Palmer amaranth

decrease font size  Resize text   increase font size       Printer-friendly version of this article Printer-friendly version of this article

Palmer amaranth has been increasing around the Midwest and Conservation Reserve Enhancement Program (CREP) seedings can apparently be one source of new infestations. Much of the seed for CREP seeding comes from Kansas where Palmer amaranth and other pigweeds are abundant, and it has become apparent over the past decade that it is possible to have Palmer amaranth seed present in the seed mixtures used to establish CREP areas. We so far have one major Palmer amaranth infestation in far southern Ohio, and it was our assessment that a CREP seeding about five years ago was probably the source of Palmer amaranth there. We also identified Palmer amaranth in several other CREP seedings about 7 years ago, but none of these appeared to gain a foothold in nearby crop fields. We were made aware of the presence of Palmer amaranth in another new CREP area last week, and we are assuming that the source of the Palmer there was also contamination of the seed mix. The Palmer amaranth infestation in far southern Ohio is definitely resistant to glyphosate, but we don’t yet know whether this new one is resistant. 

One of our assumptions about Palmer amaranth based on experiences in the southern United States is that it will likely develop glyphosate resistance in crop fields when exposed to repeated applications of glyphosate. It’s important that we err on the side of preventing new infestations of Palmer amaranth in Ohio so that we don’t have similar experiences here. We are working with several agencies to better determine whether seed used to establish CREP does contain Palmer amaranth seed, and if so, what steps need to be taken to make sure this stops. Our recommendation at this point for landowners and growers is to scout recently established CREP areas for the presence of Palmer amaranth. Plants that are not yet producing viable seed (small black seed when you shake or smash seedheads in your hand) should be removed from the field immediately to prevent seed production. Herbicides applied now are not likely to adequately prevent the development of viable seed. Where plants are already producing viable seed, it would probably be best to just leave them where they are to prevent spread of seed. Intensive monitoring of any infested areas and adjacent fields should obviously also occur for the next several years. There is information on identification and management of Palmer amaranth on the OSU and Purdue weed science websites, including short videos on identification that can be reviewed prior to crop harvest. Click here to access the OSU Extension page on Palmer amaranth.

Buyers Guide

Doyle Equipment Manufacturing Co.
Doyle Equipment Manufacturing prides themselves as being “The King of the Rotary’s” with their Direct Drive Rotary Blend Systems. With numerous setup possibilities and sizes, ranging from a  more...
A.J. Sackett Sons & Company
Sackett Blend Towers feature the H.I.M, High Intensity Mixer, the next generation of blending and coating technology which supports Precision Fertilizer Blending®. Its unique design allows  more...
R&R Manufacturing Inc.
The R&R Minuteman Blend System is the original proven performer. Fast, precise blending with a compact foot print. Significantly lower horsepower requirement. Low inload height with large  more...
Junge Control Inc.
Junge Control Inc. creates state-of-the-art product blending and measuring solutions that allow you to totally maximize operating efficiency with amazing accuracy and repeatability, superior  more...
Yargus Manufacturing
The flagship blending system for the Layco product line is the fully automated Layco DW System™. The advanced technology of the Layco DW (Declining Weight) system results in a blending  more...
Yargus Manufacturing
The LAYCOTE™ Automated Coating System provides a new level of coating accuracy for a stand-alone coating system or for coating (impregnating) in an automated blending system. The unique  more...
John Deere
The DN345 Drawn Dry Spreader can carry more than 12 tons of fertilizer and 17.5 tons of lime. Designed to operate at field speeds up to 20 MPH with full loads and the G4 spreader uniformly  more...
Force Unlimited
The Pro-Force is a multi-purpose spreader with a wider apron and steeper sides. Our Pro-Force has the most aggressive 30” spinner on the market, and is capable of spreading higher rates of  more...
BBI Spreaders
MagnaSpread 2 & MagnaSpread 3 — With BBI’s patented multi-bin technology, these spreaders operate multiple hoppers guided by independent, variable-rate technology. These models are built on  more...

Comments (0) Leave a comment 

e-Mail (required)


characters left


Meridian’s conveyors deliver seed with unmatched versatility. Meridian’s transport conveyors are manufactured with heavy-duty, fully enclosed construction. Meridian’s cross cleated ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form