As The Weeds Turn

To completely understand just how deeply the problem of weed resistance now runs, maps don’t lie. During his presentation at the Total Weed Management Answer Forum in Wisconsin Dells, WI, Dr. Chris Boerboom, Extension weed scientist at the University of Wisconsin, showed attendees maps of the continental U.S., Ohio, and Indiana. In each case, the various counties and states were shaded in multiple hues of yellow and red — illustrating just how widespread the problem of resistant weeds is.

“One field in Montgomery County in Indiana has glyphosate-resistant marestail, glyphosate-resistant giant ragweed, and glyphosate-tolerant common lambsquarters,” said Boerboom. “This has increased the proposed her­b­icide program cost for this grower from $18 per acre to $37 per acre, which doesn’t include the cost of application.”

Continuing to address the problem, CropLife® magazine — with sponsorship assistance from Monsanto Co. — hosted a series of seminars in a half-dozen cities across the Midwest and South during the winter months. Regardless of location, however, the goal remained the same — to help growers figure out ways to combat this growing threat to crop yield in their areas.

If nothing else, said Boerboom, growers should get used to the idea that weed control will take more active ingredients — and money — than ever before. “Multiple-resistant giant ragweed brings us closer to the point where it is impossible to obtain control in soybeans,” he said. “Control requires money, and $50 per acre for weed control, exclusive of the hidden cost of weed control in seed price, is not out of the question.”

Boerboom also reviewed some of the new herbicides for corn and soybeans scheduled to hit the marketplace during 2008. These included Halex, a POST product for glyphosate-resistant corn; Laudis, a POST broadleaf and grass herbicide for corn; and Evive and Enlite, a pair of burndown/PRE broadleaf herbicides for soybeans.

At the Total Weed Management Answer Forum in Lafayette, IN, Dr. Bill Johnson, associate professor, weed science for Purdue University, told attendees that there were times when applying more herbicide was useful, depending upon the weed. “Shattercane is a different story,” said Johnson. “With this weed, we still recommend using a residual and glyphosate late to prevent seed production.”

Waterhemp Worries

At the Answer Forum in Col­umbia, MO, Extension Weed Specialist Kevin Bradley noted that enemy No. 1 for growers and retailers has become common waterhemp. The main practice that led to waterhemp developing resistance in the state has been growers that plant Roundup Ready soybeans year after year, in some cases for nearly a decade.

Waterhemp is also a growing problem in east Texas, with some glyphosate-tolerant and potentially resistant biotypes emerging, says Paul Baumann, professor and Extension weed specialist,Texas A&M University. Baumann spoke at a Total Weed Management event in El Campo, TX. Among the more widespread issues is sulfonylurea resistant ryegrass, reported in several counties in the state. 

To address the problem, Wisconsin’s Boer­boom recommended growers take the following steps:

•  Start with a clean field and control weeds early by using a burndown treatment or tillage in combination with a preemergence residual herbicide as appropriate.

•  Apply integrated weed management practices, including multiple modes of actions and crop rotation.

•  Use the full recommended herbicide rate and proper application timing.

•  Scout fields after herbicide application to ensure control has been achieved.

•  Use good agronomic principles that enhance crop competitiveness as well as scouting, monitoring, and cleaning equipment between fields.

“Good weed management is more than good weed control,” concluded Boerboom.

While agronomy is key, taking the discussion right down to the grower’s bank account is also important. Bradley says that even with the threat of resistance, in his experience, growers have been most responsive to dollars and cents. “I think growers are more willing to utilize a preemerge if we talk about how it maximizes crop yield and prevents yield loss,” said Bradley.

 

 

Leave a Reply

Herbicides Stories

glyphosate
Crop InputsWHO: Glyphosate ‘Unlikely’ To Cause Cancer
May 16, 2016
Via Reuters.com reporter Kate Kelland: The weed-killing pesticide glyphosate, made by Monsanto and widely used in agriculture and by gardeners, Read More
dicamba, Roundup Ready 2 Xtend
Crop InputsASA: No Dicamba On Roundup Ready 2 Xtend In 2016
May 16, 2016
While Roundup Ready 2 Xtend (RR2X) are tolerant to dicamba and glyphosate herbicides, no dicamba herbicides will be approved for Read More
CPP, glyphosate, dicamba, atrazine,
Crop InputsReport: Congress Pressing EPA On Glyphosate Review Handling
May 16, 2016
Via Reuters.com reporter P.J. Huffstutter: U.S. lawmakers have asked EPA to explain why it published – and then withdrew – Read More
Palmer amaranth in soybean stubble
HerbicidesWSSA: Billions In Potential Economic Losses From Uncontrolled Weeds
May 4, 2016
What losses would corn and soybean growers experience if they were forced to eliminate herbicides and other control techniques from Read More
Trending Articles
The Andersons Waterloo
ManagementFirst Indiana Facility Certified Under 4R Nutrient Stewardship Certification Program
June 27, 2016
The 4R Nutrient Stewardship Certification Program has announced that The Andersons, Inc.’s Waterloo, IN, facility has been added to its Read More
Food IT
Industry NewsCalifornia Event Will Mix Ag And Tech Professionals To Explore IT Solutions
June 20, 2016
Silicon Valley is hot on agriculture, and an upcoming event in California will bring together the food and tech industries Read More
Monsanto Luling Plant
Eric SfiligojWhat’s Next For Monsanto?
May 31, 2016
For the folks at Monsanto’s headquarters in St. Louis, MO, it has been an eventful few weeks. Back on May Read More
Soybean Plant closeup
Industry NewsMonsanto Rejects Bayer Bid; Open To More Talks
May 25, 2016
Monsanto Co, the world’s largest seed company, turned down Bayer AG’s $62 billion acquisition bid as “incomplete and financially inadequate” Read More
Eric SfiligojPity The Monsanto Haters
May 23, 2016
An old saying goes thus: “Be careful what you wish for. You just might get it.” Given current events, there Read More
Monsanto Luling Plant
Crop InputsReport: Bayer Eyeing Monsanto For Possible Mega-Merger
May 16, 2016
Bayer AG is exploring a potential bid for U.S. competitor Monsanto Co. in a deal that would create the world’s Read More
Latest News
Industry NewsCompass Minerals Names Protassium+ Sales Director
June 28, 2016
Compass Minerals, the producer of Protassium+ sulfate of potash, has named Scott Johnson director of sales for Protassium+ North America. Read More
Eric SfiligojThe British Leave Vote Impact On EU Agriculture
June 27, 2016
Like virtually everyone else in the world this past week, I’ve watched the global reaction to Britain’s vote to exit Read More
Valent David Nothmann
Crop InputsValent Names David Nothmann Vice President Of Marketing
June 27, 2016
Valent U.S.A. Corp. has announced the appointment of David Nothmann as vice president of marketing. Nothmann will be responsible for Read More
The Andersons Waterloo
ManagementFirst Indiana Facility Certified Under 4R Nutrient Stew…
June 27, 2016
The 4R Nutrient Stewardship Certification Program has announced that The Andersons, Inc.’s Waterloo, IN, facility has been added to its Read More
CropLife 100BRANDT Contributes To Mayo Clinic
June 27, 2016
BRANDT, a leading agriculture retailer and manufacturer of specialty agriculture products, has pledged a sizable donation to the Mayo Clinic Read More
ManagementReport: U.S. Farmland Values On Average Continue Gradua…
June 27, 2016
Land price movement has been in the forefront for farmers, landowners, lenders and land brokers for a decade now during Read More
AdjuvantsPrecision Laboratories Introduces Intact Xtra For Use W…
June 27, 2016
Precision Laboratories announces the launch of Intact Xtra, an adjuvant designed for applicators who want to maximize spray applications and Read More
Key Cooperative’s new liquid fertilizer, crop chemical, and seed facility in Grinnell, IA stores 1.5 million gallons of liquid fertilizer and 120,000 gallons of crop chemicals.
Retail FacilitiesKey Cooperative Facility Features The Latest In Murray …
June 27, 2016
When Key Cooperative wanted to improve the overall efficiency at its new state-of-the-art facility in Grinnell, IA, it turned to Read More
Allen Summers Asmark Institute PSM Training
EmployeesAsmark Institute Sponsors 25 ResponsibleAg Auditor Trai…
June 21, 2016
The Asmark Institute has announced plans to provide 25 scholarships through their affiliated State fertilizer and agrichemical associations to help encourage Read More
Kennebec Elevator
CropLife 100Wheat Growers Celebrates Kennebec Elevator Grand Openin…
June 21, 2016
Over 250 patrons and guests were on hand to celebrate Wheat Growers’ Kennebec Elevator grand opening. South Dakota Secretary of Read More
Land O Lakes
Industry NewsLand O’Lakes To Acquire Ceres
June 20, 2016
Land O’ Lakes, Inc. and Ceres, Inc. have announced that they have signed a definitive merger agreement under which Land O’Lakes Read More
Food IT
Industry NewsCalifornia Event Will Mix Ag And Tech Professionals To …
June 20, 2016
Silicon Valley is hot on agriculture, and an upcoming event in California will bring together the food and tech industries Read More
LegislationVilsack Christens WinField Crop Adventure, Talks Monsan…
June 17, 2016
The WinField Crop Adventure grand opening ceremonies at Fair Oaks Farms (near Winemac, IN) welcomed USDA Secretary of Agriculture Tom Read More
Crop InputsFields of the Future: WinField Doubles Down with Agri-E…
June 16, 2016
Land O’Lakes, Inc., joined by Agriculture Secretary Tom Vilsack, today will host Fields of the Future, a live broadcast about Read More
Bayer sign
Crop InputsMonsanto Turns Back Bayer Again
June 14, 2016
Bayer AG’s bid to buy Monsanto Co. for more than $60 billion has hit an impasse that could pose a Read More
Young Corn Field
Crop NutritionNext Generation Of Nitrogen Efficiency Technology Conve…
June 13, 2016
Commodity price projections indicate farmers will continue to face tight margins again this year. Delivering higher yields and more bushels Read More
Industry NewsLa Crosse Seed Acquires Cover Crop Solutions Brand
June 10, 2016
La Crosse Seed announces that it is the new and exclusive owner of the entire family of brands of Cover Read More