The Value of Weed ID

Effective weed management starts with knowing your weeds  Weed species vary in their response to different control strategies. That’s why identifying the weeds in your fields — and understanding their biology — is essential for choosing effective management plans.   The following checklist includes some of the details you should know about your Click To View

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Dicamba Impacts for 2018

New label imposes additional requirements  Changes to dicamba herbicide labels will affect how you use the technology in the coming season.   The changes include restrictions on who is permitted to apply these herbicide formulations in 2018 and when spraying is allowed. The new requirements by the U.S. Environmental Protection Agency are a response to Click To View

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Pay Attention to Timing

Remove weeds before they interfere with yield  Are you killing weeds at the right time — before they start cutting into yield?   Research shows that good weed control within the first four to six weeks after crops are planted is critical to avoid yield losses from weed interference. Iowa State University weed experts remind growers that “the effectiven Click To View

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Knowing the Mode of Action

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Weeds: Focus on Giant Ragweed

Early emergence, rapid growth characterize this aggressive competitor  Giant ragweed (GRW) is an aggressive weed that poses a significant threat to corn and soybean yields. Season-long competition from just one GRW plant per 110 square feet can cut soybean yields by 50 percent. Two GRW plants in the same amount of space will reduce corn yields by 13 pe Click To View

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Understanding Resistance

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The Value of Mode of Action

Understanding mode of action can help you manage herbicide resistance  Farmers hear a lot about herbicide “mode of action” these days. But why is it important?   Mode of action (MOA) is a simple but valuable tool developed by the Weed Science Society of America to help you plan a more diverse, sustainable and effective herbicide program. Here are Click To View

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Tankmix MOA For Best Results

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Weed Control and Nitrogen

Are early-season weeds stealing your nitrogen?  Weeds compete with crops for sunlight, water and nutrients — especially nitrogen (N). You might be shocked at just how much N early-season weeds can steal, even when they are small.   Many research studies have demonstrated this insidious loss. A study by the University of Wisconsin in 2006 and Click To View

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Starting with a Clean Field

Weed control must begin before planting  Planting into weed-free fields helps ensure a strong start for your crop.  By contrast, seeding into established weeds increases risk and supresses yield potential. Once the crop is planted, your weed control options are much more limited. And if weeds are developing resistance, even herbicide mixtures with mu Click To View

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Focus on Marestail

Biology, herbicide resistance make marestail a tough competitor  Marestail (horseweed) competes with soybeans throughout the season and can cut crop yields significantly if it’s not controlled before planting. The Weed Science Society of America calls marestail one of the 10 worst herbicide-resistant weed species. This annual weed is a threat for seve Click To View

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A Look at Proactive Prevention

Three principles of effective herbicide resistance management How can you prevent herbicide-resistant weeds in your fields? Adopt an integrated weed management (IWM) program that attacks weeds on many fronts and avoids overuse of any single chemistry. IWM employs a variety of cultural, chemical, mechanical and biological tactics, including: scouting crop rotat Click To View

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Tank Mixing for Best Results

Successful farmers use multiple herbicides in every application. Various approaches to tank mixing two or more herbicides that are labeled for your most troublesome weeds can slow down the evolution of resistance. That’s one of the findings of a recent study by weed scientists at the University of Illinois and the U.S. Department of Agriculture. The following points are Click To View

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Know the Difference Between Site of Action and Mode of Action

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How Weeds Cost You This Year

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How to Balance ALS Herbicides Effectively

ALS herbicides have taken some punches over the years, but they can still pack a potent wallop of their own. The secret is learning how to best balance them with other chemistries to tap into their effectiveness.  The bad news? Dozens of ALS-resistant incidents have popped up across the world. The good news? This herbicide class (Group 2) can still provide e Click To View

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How to Know the Difference Between Common Grass Species

Compared to broadleaf weeds, various grass species can be difficult to distinguish. After all, many have a similar shape and size.  Even so, there are some telltale signs that can help crop scouts make a proper identification. That’s an important step when setting up an integrated weed management (IWM) approach. IWM is the sustainable use of all available meth Click To View

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Find Herbicide Resistant Weeds in Your Fields Early

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How ACCase Resistance Shapes Weed Control

Worldwide, there are nearly 500 unique cases of herbicide-resistant weeds. Group 1 ACCase inhibitors have a long list of incidents in the U.S. and worldwide, yet are rarely discussed.   And even though ACCase-resistant grasses may not hurt yields as much as broadleaf weed species, they should still factor into a grower’s weed-control management decisions, says Click To View

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What About Waterhemp?

Pigweeds may steal more headlines, but its cousin waterhemp is serious news, too. It can grow an inch per day and threaten yields considerably. One plant can drop as many as 1 million seeds, which stay viable in the soil for up to four years.  According to Purdue University Extension, serious infestations require three to four years of intensive weed management prac Click To View

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Manage Resistant Weed Populations

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Six Ways to Manage HPPD Resistance

HPPD inhibitors are powerful additions to the weed-control toolbox, but there are no bulletproof answers in the fight against herbicide resistance.  To date, HPPD inhibitors have suffered multiple confirmed cases of resistance involving Palmer amaranth and waterhemp. Resistant weeds have been found in Kansas, Nebraska, Wisconsin, Illinois and Iowa in cases stretchi Click To View

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The Secret to Slowing Down Pigweed

Pigweed is thought to have acquired its name because it was once fed to pigs. But farmers have come to find its name appropriate for another reason – it gobbles up sunlight, water, and nutrients intended for their crops. The cost of this resource grab can be severe. The University of Illinois has cited yield losses as high as 78% in soybeans and 91% in corn, and farther Click To View

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Three Tips to Master Proactive Weed Control

When just a handful of prolific, pervasive weeds such as Palmer amaranth and waterhemp are able to pump millions of seeds into a field, experts agree: a zero-tolerance approach to weed management is the new standard.  This stance requires the adoption of a proactive weed-control mindset. Three strategies in particular will put farmers on the right path.  St Click To View

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Is One-Pass Weed Control Off the Table? 

There was a time when one-pass weed control was a viable farming practice. The modern era of tough-to-control and resistant weeds requires a more proactive, integrated management approach, however.  One-pass systems lean heavily on delivering a level of weed control that satisfies an economic threshold. However, experts are increasingly recommending a shift toward a Click To View

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6 BROADLEAVES TO WATCH

“You can’t manage what you can’t measure.” That truism applies a lot in farming, including weed control. Farmers need to know what species of weed - and how many - are in a given field before they can map out a solution. Sometimes, it can be hard to know where to start. After all, there are dozens upon dozens of weed species that can invade a particular field. St Click To View

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10 LONG-TERM STRATEGIES

Resistant weeds are not a new problem. In fact, the first documented case stretches all the way back to 1970. In the years following, the problem has become outright staggering, with a total of 481 unique cases of resistance documented by the International Survey of Herbicide Resistant Weeds. The problem may feel overwhelming, but farmers have a clear plan of attack when Click To View

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Solutions that worked

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