Only three years before Iowa waterhemp disaster

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

Richard KellerGroup listens to Mike Owen as huge waterhemp is in the background during a Bayer CropScience Respect the Rotation tour. University weed scientists and Bayer CropScience representatives presented evidence of major glyphosate resistance in waterhemp occurring in Iowa during a Respect the Rotation show-and-tell plot tour and information meeting. The purpose of the meeting was to warn growers, ag retailers and professional agronomists to “get out front of weed resistance instead of playing catch up.”

Growers and ag retailer agronomists toured a 10-acre field plot in north central Iowa near Ellsworth. Media toured the plots with representatives of Asmus Farm Supply, which is based out of the northwest Iowa town of Rake.

Two university weed scientists presented their points of view—Mike Owens, Ph.D., Iowa State University professor, and Jason Nosworthy, University of Arkansas associate professor. A former university weed scientist also made brief comments.

Owen noted, “There has never been anything like glyphosate in the history of agriculture” because of its efficacy, simplicity and convenience. He said it was inevitable that resistance would develop to glyphosate. It should have only been a question of how long because the obvious example of weed resistance occurred with ALS inhibitors in Iowa during the late 1980s.

That ALS resistance has not gone away as Owen has not been able to find a waterhemp population in the state that isn’t still ALS resistant. Once waterhemp is glyphosate resistant, it could be eternally resistant to both ALS inhibitors and glyphosate. Waterhemp in various locations of the nation has been found to be resistant to five modes of action—HPPD, ALS, PPO, atrazine and glyphosate. And Owen said this is “really problematic.”

Mode of action rotation with a pre-emergence herbicide and the same with post-emergence herbicides plus mechanical weed control as necessary was the message from Owen. Professional agronomists have to make recommendations that preserve the technology we have today for as long as possible by using full rates in combination. He explained that the last new herbicide mode of action discovery was the HPPDs approximately 22 years ago and no new ones are on the horizon.

“We are lucky to have a lot of older herbicides that still work but are not simple and convenient,” said Owen, about soybean weed control in the Midwest.

He told the ag retailers, “It is hard to sell stuff they (farmers) don’t want to buy, but you have to work at it.” Selling those additional herbicides is the only way glyphosate can be available for use in appropriate and necessary ways in the future.

Nosworthy provided data explaining research showing the success of 15-inch soybean planting canopying earlier than 30-inch rows and the potential for higher seed populations helping keep weeds from emerging following a pre-emergence herbicide application.

He further noted, “Using a herbicide that is 95 percent effective will be a failure.” Growers cannot allow resistant weeds to spread their seed. “We have got to get weeds out of fields before they go to seed.”

In general, he said Arkansas is a disaster in terms of Palmer amaranth that is glyphosate resistant, and Iowa is two to three years behind Arkansas with waterhemp being the pigweed-family glyphosate-resistant weed that will take over fields.

He said if growers aren’t proactive and take recommended steps to preserve glyphosate efficacy, “In three to four years, you’ll have growers who are going to completely lose a crop.”

In summary, he recommends growers look at planting in narrow rows and higher seed populations, making sure to reduce the weed seed bank by keeping weeds from going to seed and definitely using residual herbicides in a weed control program.

Private Arkansas research consultant and former University of Arkansas weed scientist Ford Baldwin said in Arkansas “we have basically driven the world’s greatest herbicide off the cliff.” He was the most pessimistic speaker about the Arkansas situation by saying, “It is too late to get the glyphosate technology back.”

Baldwin and all the speakers said midwestern farmers have a chance to save the technology, but they have to react immediately for the 2012 planting season with five-year planning for crop rotation and herbicide rotation. Bayer has been licensing a seed trait, Liberty Link, allowing over the top Ignite herbicide use.


Prev 1 2 Next All



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 (2) Leave a comment 

Name
e-Mail (required)
Location

Comment:

characters left

Mark Bausch    
Thornton, Iowa  |  September, 20, 2011 at 09:43 AM

Only 3 years before a waterhemp disaster? It's already a disaster! We have glyphosate resistant waterhemp and giant ragweed scattered all over in north central Iowa.

MIke Owen    
3218 AGronomy Hall  |  September, 23, 2011 at 08:00 AM

Mark, I agree with your statement and have been warning against glyphosate resistant weeds since the early 1990's. The context of the "three year" quote which was offered by Dr. Baldwin was that in his opinion, Iowa would have the glyphosate resistance issues in common waterhemp that they now are experiencing in the Delta with Palmer pigweed - fields that cannot be farmed due to the glyphosate resistant Palmer pigweed. Thanks for your perspectives. Incidentally, I had grower field research studying glyphosate-resistant giant ragweed near Thorton a number of years ago; the problems are increasing at an increasing rate. Mike


X-TENDED REACH GRAIN CARTS

YOUR BEST HARVEST IS NOW WITHIN REACH J&M introduces their patented line of X-tended Reach grain carts, featuring a frontfolding single ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form