Multiple Herbicide Resistance Found In Illinois Waterhemp

Common/Tall Waterhemp
Common/Tall Waterhemp

 

Herbicide-resistant waterhemp populations will challenge weed management practices and practitioners during the 2012 growing season.

University of Illinois associate professor of weed science Aaron Hager said that the increasing occurrence of waterhemp populations that possess resistance to herbicides spanning more than one site of action further complicates management because the efficacy of multiple herbicides is compromised.

Last year, University of Illinois weed science specialists published the results of a herbicide-resistance screening program for waterhemp samples submitted during the 2010 growing season. The program uses molecular biology techniques to detect herbicide-resistance traits (glyphosate, PPO inhibitors, and ALS inhibitors) in waterhemp. In 2011, a total of 408 plants from 97 different fields suspected of having glyphosate-resistant waterhemp were submitted.

Hager explained that distinguishing between multiple herbicide resistance at the field and individual plant levels is important and can impact management options.

“Field-level multiple resistance is when resistance to herbicides from more than one site of action is present within the population growing in any particular field,” he said. “When multiple-herbicide resistance occurs at the plant level, individual plants demonstrate resistance to herbicides encompassing more than one site of action.”

Thus, when three types of resistance are present at the field level and individual plants are resistant to only one herbicide, a three-way tank mixture of herbicides A, B, and C could control all the plants in the field. However, tank mixtures of herbicides A, B, and C would not control individual plants that possess resistance to these three herbicides.

Multiple resistance often occurs at both levels in a single population. A field often includes a mix of plants, some of which are resistant to just one herbicide (or herbicide family) while others are resistant to multiple herbicide families. Tankmixing two or more postemergence herbicides may not effectively control herbicide-resistant waterhemp under these conditions.

Of the 408 plants submitted and screened from 2011, only 13% were sensitive to all three herbicides; the rest of the plants in the sample were resistant to at least one herbicide. Twenty-eight percent, 19%, and 3% of the plants were resistant only to glyphosate, ALS inhibitors, or PPO inhibitors, respectively.

On a field basis, only 4% of the 97 fields from which plants were sampled had no herbicide-resistant waterhemp. Approximately 25% of the fields contained waterhemp resistant to PPO inhibitors, 84% of the fields contained waterhemp resistant to ALS inhibitors, and 66% of the fields contained glyphosate-resistant waterhemp.

“Keep in mind that these fields – and plants within fields – were not randomly selected but were sampled based on suspected resistance to glyphosate,” said Hager. He also noted that the field-level results are based on small samples (five or fewer plants per field). “It is likely that, had a larger number of samples been taken, we would have found more fields with resistance to ALS and PPO inhibitors,” he said.

Even with this sample-size limitation, over 10% of the fields were found to contain three different types of herbicide resistance, which greatly increases the difficulty of managing these populations using only postemergence herbicides labeled for use in conventional or glyphosate-resistant soybean varieties. Results from this and previous surveys suggest that glyphosate-resistant waterhemp occurs in many fields across the southern two-thirds of Illinois.

This survey was only one project in the ongoing research portfolio on herbicide-resistant weeds in Illinois. Weed scientists at several Illinois universities are studying this phenomenon and working to develop viable solutions for Illinois growers. Much of this research is made possible by multiple public and private funding sources, including the Illinois Soybean Association.

Topics:

Leave a Reply

Herbicides Stories
HerbicidesScouting Key To Next Season’s Soybean Herbicide Program
August 12, 2014
When growing soybeans, growers need to think ahead to stay one step ahead of weeds. That means examining weed threats and evaluating which herbicides work best. Read More
HerbicidesArysta Touts Burndown Herbicide For Brome Management In Wheat
June 4, 2014
Arysta LifeScience North America recommends PRE-PARE Burndown Herbicide for effective brome management in winter wheat. Read More
HerbicidesFall Herbicide Applications More Effectively Manage Resistant Italian Ryegrass
May 14, 2014
Field studies show that a fall application of certain herbicides before weed emergence, leads to more successful crop planting and weed control in spring. Read More
Waterhemp in soybean stubble
HerbicidesThe Weed Resistance Problem: A Matter Of Billions
April 1, 2014
Not only is the amount of money being spent to control these yield robbers high, but the toll it has taken on the human population is growing lager by the day. Read More
Top 100 Articles
CropLife 100The Andersons Starts Venture Capital Subsidiary
January 26, 2015
The Andersons has established Maumee Ventures, a venture capital subsidiary designed to foster promising innovations that strategically align with the company’s core businesses. Read More
CropLife 100CHS Partners With Northern Partners Coop On Fertilizer Warehouse
January 21, 2015
In addition, the two companies will form a joint venture to build and operate a grain barge loading facility that will handle corn, soybeans and wheat for export through the CHS terminal at Myrtle Grove, LA. Read More
CropLife 100Wilbur-Ellis Move To Colorado Complete
January 20, 2015
Wilbur-Ellis Co. announces the opening of its new Agribusiness Division location in the Denver, CO, Metro Area. The new facility will host key personnel as the company shifts the base of its Agribusiness operations from California to Colorado. Read More
CropLife 100United Suppliers, McGregor Co., Five Others To Form Aligned Ag Distributors
January 20, 2015
These companies will continue to operate as independently owned and operated businesses, however, their crop protection divisions will now be formally aligned under the umbrella of Aligned Ag Distributors. Read More
CropLife 100Bozeman Named SEEDWAY Chief Operating Officer
January 16, 2015
He succeeds Donald Wertman, who will retire at the end of August 2015 after 40 years with the GROWMARK subsidiary. Read More
CropLife 100Wilbur-Ellis’ Craig Bair Honored For Safety Contributions To Ag Aviation
January 14, 2015
The William O. Marsh Safety Award recognizes significant achievements in safety, safety education or an outstanding operational safety program. Read More
Latest News
Seed/BiotechDow Details Enlist Trait Stacking Standards
January 30, 2015
Dow says it will allow the Enlist trait to be stacked with advanced glyphosate traits only, and will not allow stacking with the first generation of the Roundup Ready trait. Read More
ManagementCropLife Retail Week: IFCA’s Jean Payne on Illinois wat…
January 30, 2015
Editor Eric Sfiligoj shares insight from the Illinois Fertilizer and Chemical Association conference including a chat with IFCA President Jean Read More
ManagementOABA Conference Set To Highlight Trends, Technology And…
January 29, 2015
The third annual Ohio AgriBusiness Association (OABA) Industry Conference is set to take place February 4-5. Read More
FertilizerThe Fertilizer Institute President Jahn Testifies Befor…
January 28, 2015
The committee hearing, "Freight Rail Transportation: Enhancing Safety, Efficiency, and Commerce," looked at challenges facing our nation's freight rail network created by higher demand, rules and regulations and infrastructure needs. Read More
HerbicidesPurdue University Acquires Technology For Herbicide Mol…
January 28, 2015
Protea's LAESI DP-1000 Instrument System will be used in Purdue's College of Agriculture, the Department of Botany and Plant Pathology, for the molecular imaging of herbicide active ingredients and other related compounds to optimize herbicide applications and improve weed management.  Read More
FertilizerH.J. Baker Hires New Crop Peformance Marketing Manager
January 27, 2015
As Marketing Manager for the Crop Performance division, Usman Khalid will work out of H.J. Baker’s global headquarters in Westport, CT, and will drive new initiatives for the division. Read More
CropLife 100The Andersons Starts Venture Capital Subsidiary
January 26, 2015
The Andersons has established Maumee Ventures, a venture capital subsidiary designed to foster promising innovations that strategically align with the company’s core businesses. Read More
Exclusive state-of-the art Stueve Construction designed “Vista View” Elevated Control Room.
Eric Sfiligoj2015 Agricultural Market Read: Mixed
January 26, 2015
The agricultural market could look radically different this year, profit-wise, depending upon which segment you do business in. Read More
Edward Chell Biosafe
Crop InputsBioSafe Systems Names Ed Chell California Territory Man…
January 26, 2015
BioSafe Systems has announced the recent addition of Ed Chell as California Territory Manager for the agrichemical division, supporting the crop protection, water treatment and food safety business segments. Read More
InsecticidesBayer CropScience Introduces Sivanto Insecticide
January 26, 2015
Sivanto precisely targets key damaging pests at multiple insect life stages to prevent damage to plants and help minimize the spread of diseases from insect carriers. Read More
ManagementRetail Collaboration, Communicating Agriculture’s Good …
January 23, 2015
Editors Paul Schrimpf and Eric Sfiligoj discuss the recent creation of Aligned Ag Distributors, and the US Farmers and Ranchers Read More
FertilizerOSU Expert: Toledo Water Crisis A Turning Point For Ohi…
January 23, 2015
The August 2014 water crisis in Toledo, OH, impacted Ohioans’ views of Lake Erie algae problems by increasing the attribution of blame of algae growth on agriculture. Read More
FertilizerH.J. Baker Launching TIGER XP
January 22, 2015
Tiger-Sul introduces this next generation sulphur-bentonite product with a proprietary activator – ensuring farmers have a well-balanced nutrient replacement program. Read More
Crop InputsH.J. Baker Expands China Sales Force
January 21, 2015
Global Agricultural firm H.J. Baker announced that sales veteran Shi Dongshen has joined their Shanghai office in China. This newest hire follows the recent opening of their Lianyungang Sulphur Bentonite Plant. Read More
CropLife 100CHS Partners With Northern Partners Coop On Fertilizer …
January 21, 2015
In addition, the two companies will form a joint venture to build and operate a grain barge loading facility that will handle corn, soybeans and wheat for export through the CHS terminal at Myrtle Grove, LA. Read More
Matt Hopkins5 Bold Predictions For Ag Retail In 2015
January 21, 2015
This past year was filled with ups and downs for the nation’s top ag retailers, but what will 2015 have in store? Read More
SoftwareDeere Launches App Center
January 20, 2015
The John Deere App Center provides users the ability to search and find apps most useful to their business or operations. Read More
Crop InputsNew Syngenta Herbicide Approved In Soybeans, Sunflowers
January 20, 2015
Syngenta will sell BroadAxe XC herbicide in 2015 for use on soybeans, sunflowers and dry peas Read More