Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Farmers relying on Roundup lose some of its benefit

16.04.2009
Roundup Ready crops have made weed control much easier for farmers, but a new study shows their reliance on the technology may be weakening the herbicide's ability to control weeds.

Bill Johnson, a Purdue University associate professor of weed science, said farmers who plant Roundup Ready crops and spray Roundup or glyphosate-based herbicides almost exclusively are finding that weeds have developed resistance. It is only a matter of time, Johnson said, before there are so many resistant weeds that the use of glyphosate products would become much less effective in some places.

"We have weeds that have developed resistance, including giant ragweed, which is one of the weeds that drove the adoption of Roundup," Johnson said. "It's a pretty major issue in the Eastern Corn Belt. That weed can cause up to 100 percent yield loss."

Johnson was part of a team, including Steve Weller, a Purdue professor of horticulture and landscape architecture, that surveyed farmers in Indiana, Illinois, Iowa, Mississippi, Nebraska and North Carolina about their views on the ability of Roundup Ready crops to help control problematic weeds. A paper on the survey was published in the most recent edition of the journal Weed Technology. Researchers from Iowa State University, Mississippi State University, North Carolina State University, the University of Nebraska and Southern Illinois University Carbondale also contributed.

Roundup Ready crops are resistant to glyphosate, the active ingredient in Roundup. So, if a farm uses Roundup Ready crops, the herbicide can be sprayed on crops to kill weeds without damaging those crops.

Johnson said the problem has become farmers' overreliance on Roundup and Roundup Ready crops. Those who saw the most benefit from using Roundup, according to the survey, rotated between types of crops and those that were Roundup Ready and conventional crop varieties.

Johnson said this shows that subjecting weeds to different herbicides is important to keeping them from developing resistance to any particular herbicide.

"Farmers do not think resistance is a problem until they actually have it," Johnson said. "And they think the chemical companies can turn on the spigots and produce a new herbicide whenever they want. The problem is, since Roundup is so effective, there's not been any money for new herbicide discovery."

Johnson said farmers should treat Roundup and Roundup Ready crops as an investment and work to protect the technology. Rotating crops consistently and using various herbicides will slow the development of glyphosate-resistant weeds.

"Go after weeds with two different herbicides. That's the best short-term solution," Johnson said. "We want to minimize the number of weeds resistant to Roundup. To do that, you want to minimize the exposure that a weed population has to Roundup. If you diversify a little bit, you'll extend the life of the technology."

Monsanto, the maker of Roundup, funded the survey. Johnson said the next step is studying the differences among management strategies in grower fields to see which will slow the build-up of glyphosate resistance.

Writer: Brian Wallheimer, (765) 496-2050, bwallhei@purdue.edu
Source: Bill Johnson, (765) 494-4656, wgj@purdue.edu
Ag Communications: (765) 494-8415;
Steve Leer, sleer@purdue.edu

Brian Wallheimer | EurekAlert!
Further information:
http://www.purdue.edu

More articles from Agricultural and Forestry Science:

nachricht New study shows producers where and how to grow cellulosic biofuel crops
17.01.2018 | University of Illinois College of Agricultural, Consumer and Environmental Sciences

nachricht Robotic weeders: to a farm near you?
10.01.2018 | American Society of Agronomy

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

Im Focus: A thermometer for the oceans

Measurement of noble gases in Antarctic ice cores

The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

Gran Chaco: Biodiversity at High Risk

17.01.2018 | Ecology, The Environment and Conservation

Only an atom thick: Physicists succeed in measuring mechanical properties of 2D monolayer materials

17.01.2018 | Physics and Astronomy

Fraunhofer HHI receives AIS Technology Innovation Award 2018 for 3D Human Body Reconstruction

17.01.2018 | Awards Funding

VideoLinks
B2B-VideoLinks
More VideoLinks >>>