Resistance Fighter | Syngenta US

Resistance Fighter: Herbicide Resistance Management

Win the Battle Against Resistant Weeds

Take steps to manage herbicide resistance in your area.

Are you keeping your herbicide program effective for your farm’s future? Choose a herbicide program that will last for the next generation.

When it comes to the future of your operation, actions speak louder than words. For decades, Syngenta has been collaborating with university experts and conducting research to solve problems associated with resistant weeds. And when you look at your current toolbox for managing resistance, many of the herbicides currently available contain active ingredients originally developed in our labs.

With our Resistance Fighter® program, you can depend on localized solutions crafted by our agronomy experts who live and work in your area. You will also gain access to the most diverse, effective herbicide portfolio available to successfully manage resistant weeds in your area.

Why has our Resistance Fighter program always had your back? Because we’ve always thought that the only legacy worth having is one built upon preserving yours.

Tips for Good Stewardship:

  • Start clean, utilizing tillage or an effective burndown plus a pre-emergence residual herbicide application
  • Always use a two-pass, pre- and post-emergence system with herbicides at full labeled rates
  • Use multiple effective sites of action with overlapping residuals
  • Use diversified management programs such as cover crops, mechanical weed control and crop rotation
  • Do not allow weeds to go to seed and add to the seed bank
  • Utilize good agronomic practices – narrow rows, increased plant populations and other practices that promote crop growth and competitive ability

Test Your Weed Knowledge

The war against resistant weeds will never end, but this season’s battle can be won. Find out how much you really know about the enemy with our Weed IQ Quiz.

Take steps to manage herbicide resistance in your area.

See What Resistance Fighter Offers

Diversity is Key to Fighting Herbicide Resistance

Syngenta offers a robust portfolio of pre-emergence and post-emergence herbicides to help you stay in control of difficult weeds on your farm.

boundary 6.5 EC
Boundary® 6.5 EC herbicide allows you to extend the post-application window up to five weeks after planting.
Learn About Boundary 6.5 EC
broadaxe xc
BroadAxe® XC herbicide helps maximize soybean yield potential with early-season weed management and long-lasting residual.
Learn About BroadAxe XC
Prefix® residual herbicide offers superior control of broadleaf weeds and grass to help you maintain clean fields and increase yield potential.
Learn About Prefix
flexstar gt 3.5
With two leading active ingredients, Flexstar® GT 3.5 herbicide delivers two different sites of action to combat difficult-to-control weeds in soybeans and cotton.
Learn About FlexStar GT 3.5
Acuron® herbicide contains four active ingredients and three sites of action for multi-targeted weed control.
Learn About Acuron
acuron flexi
Acuron® Flexi herbicide defeats tough weeds with added flexibility.
Learn About Acuron Flexi
halex gt
Halex® GT herbicide provides Glyphosate with Residual™ broadleaf weed and grass control.
Learn About Halex GT
Talinor® herbicide delivers excellent standalone control to tough broadleaf weeds in wheat and barley.
Learn About Talinor


Tyler Blohm
Tyler Blohm
Retail sales agronomist and grower
Grundy Center, IA
“The most important thing for growers to know about fighting weed resistance is applying multiple effective sites of action. Spray early and get them in the dirt.”
Calvin Seitz
Calvin Seitz
Huntingburg, IN
“If you’re putting a good pre-emergence herbicide down and you’re overlapping with a post-emergence herbicide 21 to 28 days later, you’re doing what’s right."
Lance Salzmann
Lance Salzmann
Princeville, IL
“Start clean and stay clean. Don’t even let those weeds come up.”

Resistance Fighter Resources

Read the latest stories about weed management, herbicide technology and insights from our industry partners.

Fight Back Aginst Weeds
Why You Should Change up Your Control, Even if it’s Working
These days, you can’t rely on one mix of herbicides for too long. Your control program needs to evolve faster than weeds do. Read Article »
relying on a post-emergent spray program
The Risk of Relying on a Post-Emergent Spray Program
When weeds grow 4 inches tall, they’re much harder to control. That’s why you need to apply both pre- and post-emergent herbicides at just the right time. Read Article »
maintaining weed control
Alternative Methods for Maintaining Weed Control
Narrow rows, cover crops, tillage or weed seed destruction may soon be a regular component of your weed control program. Read Article »
Mastering the tank mix
Mastering the Tank Mix for Whatever Weed You Face
As you rely on more herbicides with narrower control spectrums, knowing the nuances of tank mixing is crucial to keep tough weeds under control. Read Article »
Dr. Ian Heap Chart
Weed Resistance: Not If, but When
"The two major weeds at the forefront of glyphosate resistance would be Palmer amaranth and waterhemp," said Jason Norsworthy, professor and Endowed Chair of Weed Science at the University of Arkansas. Read Article »
Giant Ragweed
Diversity is Critical to Fighting Weed Resistance
As weeds continue to develop resistance to glyphosate and other herbicide chemistries, growers have to modify and diversify their weed management programs. Read Article »
Palmer Amaranth
Weed Resistance: Inside the Grower’s Mind
No question – Roundup® was a revolutionary herbicide that changed weed control. Also no question – overuse of Roundup has created glyphosate-resistant weeds that are now pretty much everywhere that row crops are grown. Read Article »
Non-Herbicidal Tools’ Role in Diversified Weed Management
An effective, multifaceted weed management program includes not only herbicides but also cultural and mechanical practices. With an end goal of reducing the soil seed bank, researchers are exploring non-herbicidal opportunities to help growers. Read Article »
Manage New Herbicide Technology for the Future
With new dicamba soybean herbicide technology expected to come to market in 2017, growers will need to be mindful of preserving the technology while at the same time tailoring a weed management program that keeps fields clean. Read Article »
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Recent Posts


April 17, 2018

Syngenta herbicide, Fusilade® DX, cleared for tank mix on Roundup Ready 2 Xtend® soybeans

Syngenta has received confirmation from the Environmental Protection Agency (EPA) that Fusilade® DX herbicide has been cleared for tank mixing with both XtendiMax® with VaporGrip® Technology and Engenia® herbicides. Fusilade DX will be available for use on Roundup Ready 2 Xtend® soybeans, providing growers with more options for a strong weed management plan this growing season.Read more »

March 06, 2018

Syngenta identifies key strategies to manage the spread of resistant Palmer amaranth

Syngenta warns that glyphosate-resistant Palmer amaranth, one of the most threatening weeds in Southern corn and soybean fields, continues to spread into the Midwest. Knowing how to defeat this tough weed is imperative to protect crop yields and manage future resistance.Read more »

February 23, 2018

Minimize threat of resistant kochia by planning ahead, Syngenta advises

Kochia can be exceptionally competitive with corn, soybean and cereal crops. Take control of the weed by treating it with Syngenta residual herbicides and take back your field.Read more »

February 15, 2018

Syngenta recommends overlapping residuals for season-long waterhemp management

Due to the expanding threat of resistant waterhemp, Syngenta urges corn and soybean growers to prepare a management strategy that includes overlapping residual herbicides with multiple, effective modes of action (MOAs) for the upcoming growing season.Read more »