Along With Weeds, Herbicide Resistance Testing Evolves

Crops should be managed in a way to prevent weed infestations, overuse of herbicides and herbicide resistance. But in the real world, growers will use the most convenient and economical practices until a crisis forces a change. Routine monitoring of weed populations for their resistance to herbicides can avert such a crisis. Making resistance testing protocols widely available can help to attain this goal.

The journal Weed Science reports on methods of testing for herbicide resistance. The authors of a review article discuss testing techniques, including field surveys, plant sampling and dose-response levels. Rapid resistance confirmations are contrasted with more thorough DNA-based tests.

The first report of herbicide resistance came in 1957, but resistance has significantly expanded in the past decade. Today more than 200 plant species worldwide are resistant to herbicides. Modern agriculture depends on resistance testing to determine the best resistance management and mitigation. There are basic steps in testing, but details may vary depending on the herbicide mechanism of action, weed species and timing of application.

The classical approach to resistance confirmation is to collect seeds from surviving plants in suspected fields, plant them in pots and apply appropriate herbicide(s). Multiple doses, rather than a single dose, should be used. This will allow the production of a dose-response curve that will show the magnitude of resistance. The test should include three to four replications to confirm results. It can take up to 2 months to obtain results using this form of testing.

Early and rapid detection of resistance is crucial to averting economic losses. Growers seek resistance tests that allow them to make real-time decisions regarding current weed management. Quick analyses may use whole plants, seedlings, or leaf discs rather than growing new plants from seed. A leaf disc analysis, for example, may yield an initial determination of resistance on the spot or within 24 to 48 hours.

However, unlike the classical approach, these new methods are not applicable in all situations. Different tests may be needed for different weed species or herbicide mechanisms of action. Some of these rapid testing techniques are being developed for commercial use. But most growers currently rely on free testing services provided by academic, extension service, or public research institutions.

Full text of the article, “Review: Confirmation of Resistance to Herbicides and Evaluation of Resistance Levels,” Weed Science, Vol. 61, No. 1, January-March 2013, is available here.

Topics:

Leave a Reply

Herbicides Stories

Herbicides2015 ASA Trials Demonstrate Valent Fierce XLT Herbicide’s Performance
February 2, 2016
Valent U.S.A. today announced that new Fierce XLT Soybean Herbicide ranks in the top tier among growers for length of Read More
HerbicidesMonsanto Takes Legal Action To Prevent Flawed Listing Of Glyphosate Under California’s Prop 65
January 22, 2016
Monsanto Co. is taking legal action to prevent a flawed listing of the herbicide glyphosate under California’s Proposition 65 (Prop Read More
Crop Protection Products in storage
HerbicidesREUTERS: Europe Food Safety Official Wades Into Glyphosate Safety Debate
January 14, 2016
The head of Europe’s food safety watchdog has written to a group of nearly 100 senior scientists strongly rejecting their Read More
Resicore herbicide
HerbicidesDow AgroSciences Receives EPA Registration For Resicore Herbicide
January 11, 2016
The U.S. EPA has approved the registration of Resicore herbicide, which will be available to growers for the 2016 growing Read More
Top 100 Articles
Elburn Cooperative
CropLife 100Elburn Cooperative Members Vote To Join CHS
December 28, 2015
With 81% of eligible producers voting, 94% cast an affirmative ballot for Elburn Cooperative, a diversified agricultural retailer based out Read More
West Central Cooperative, Jefferson, IA
CropLife 100Farmers Cooperative-West Central Merger Approved
December 21, 2015
The members of Farmers Cooperative Co. (FC), Ames, IA, and West Central Cooperative, Ralston, IA, have both approved the merger Read More
Wheat Growers Innovation Center, Bath, SD
CropLife 100Wheat Growers Opens Innovation Center
December 21, 2015
Wheat Growers’ commitment in providing its farmer-owners with the latest in technological advancements now has a one-of-a-kind focal point, as Read More
CropLife 100ARA Selects The Andersons As 2015 Retailer Of The Year
December 9, 2015
The Agricultural Retailers Association today named Maumee, OH-based The Andersons as its Retailer of the Year for 2015. The award Read More
CPS Washington Court House John Deere Sprayer
CropLife 100Application Equipment Report: It Is Easy Being Green For Top 100 Ag Retailers
December 5, 2015
On The Muppets television show, Kermit the Frog is famous for singing a song about the troubles he encounters in Read More
Fertilizer Bin
CropLife 100Fertilizer Sales: Another Down Year For Top 100 Ag Retailers
December 4, 2015
In pure number terms, the fertilizer category still dominates all crop inputs/services among CropLife 100 ag retailers. In 2015, for Read More
Latest News
Soybean field
FungicidesFour Arysta Fungicide Formulations Given FIFRA Approval…
February 8, 2016
Arysta LifeScience North America recently announced the issuance of Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Section 2(ee) Recommendations for Read More
FungicidesAgri-Fos Systemic Fungicide Plus Receives EPA Registrat…
February 8, 2016
Vivid Life Sciences has announced the EPA registration of Agri-Fos Systemic Fungicide Plus, a highly concentrated active ingredient phosphite fungicide, Read More
Crop InputsBayer Contests EPA’s Decision On Valuable Insecticide F…
February 5, 2016
Crop Science, a division of Bayer, has announced it has refused a request by the Environmental Protection Agency (EPA) to Read More
Wheat Field North Dakota
Seed/BiotechSyngenta Wins Seed Fraud Suit Against South Dakota Grow…
February 5, 2016
Syngenta has obtained a $25,000 settlement from Paul and John Mayclin, Mayclin Farms, Plankinton, SD, in response to their Plant Read More
ManagementOABA Annual Conference Wraps Up In Columbus
February 5, 2016
More than 300 Ohio AgriBusiness Association (OABA) members and industry professionals were on hand to engage in collaborative learning and Read More
Crop InputsBayer To Contest EPA Flubendiamide Decision
February 5, 2016
Crop Science, a division of Bayer, announced today it has refused a request by EPA to voluntarily cancel the uses Read More
Syngenta
Seed/BiotechNot So Fast: ChemChina Syngenta Takeover Could Draw Nat…
February 5, 2016
State-owned China National Chemical Corp. (ChemChina), which plans to buy Swiss seeds and pesticide maker Syngenta, will promptly start preparations Read More
Rendering of Syngenta Seedcare Institute expansion
Seed/BiotechExpansion Of Syngenta’s North America Seedcare In…
February 4, 2016
As demand for seed treatment knowledge and products grows among farmers, retailers and others in the seed industry, Syngenta is Read More
Soybean Field
Industry NewsArysta LifeScience Strengthens Sales Team
February 4, 2016
Arysta LifeScience North America recently announced three new personnel additions: Jake Cook and Peter White are Territory Sales Managers for Read More
Davor Pisk Syngenta COO
Crop InputsSyngenta COO: Why ChemChina Offer Beat Monsanto’s
February 4, 2016
Syngenta Chief Operating Officer Davor Pisk says he is confident the proposed acquisition by ChemChina will ultimately help preserve choice Read More
Young corn plants in soil
Crop InputsKoch Biological Solutions Invests In Pathway Biologic
February 4, 2016
An affiliate of Koch Biological Solutions, LLC has acquired a minority equity position in, and entered into collaboration with, Pathway Read More
Crop InputsABG: China Signs Off On Monsanto’s Roundup Ready …
February 3, 2016
Monsanto Co. on Wednesday announced it plans to launch its Roundup Ready 2 Xtend soybeans in time for the 2016 Read More
Syngenta headquarters in Basel, Switzerland
Crop Inputs6 Things To Know About The ChemChina-Syngenta Deal
February 3, 2016
After months of rumors and speculation, Syngenta has announced that ChemChina has offered to acquire the Swiss-based company. “In making Read More
FertilizerPhosphorus: Is Band Or Broadcast Application The Better…
February 3, 2016
Is band or broadcast application the better method when it comes to phosphorus? The answer to this question depends mostly Read More
Syngenta Sign
Crop InputsChemChina Nearing Deal To Buy Syngenta For Record $43 B…
February 3, 2016
China National Chemical Corp. is nearing an agreement to buy Swiss pesticide-and-seeds-maker Syngenta AG for about 43.7 billion francs ($42.8 Read More
Herbicides2015 ASA Trials Demonstrate Valent Fierce XLT Herbicide…
February 2, 2016
Valent U.S.A. today announced that new Fierce XLT Soybean Herbicide ranks in the top tier among growers for length of Read More
Crop Protection Products in storage
Paul SchrimpfCrop Input Selling: Return Of The Price List
February 2, 2016
It was a good 15 years ago, shortly after I first started writing for this esteemed publication, that it all Read More
Potash storage at Growmark
FertilizerThe Phosphate And Potash Outlook For 2016
February 2, 2016
Like other commodities, prices of the leading plant nutrient products dropped sharply in 2015. At this writing, the price of Read More