Wednesday, March 16, 2011

Cereal Rotations Help Growers Go on Offensive Against Resistant Waterhemp

Unique mode of action in cereals breaks cycle of continuous glyphosate use

RESEARCH TRIANGLE PARK, N.C. (March 16, 2011) – Sometimes the best defense is a good offense. When fighting herbicide-resistant weeds, offensive moves could mean robust crop and herbicide mode of action rotations. Crop farmers on the Northern Plains may want to keep that advice in mind as glyphosate-resistant waterhemp begins to move into the region.

“Glyphosate-resistant waterhemp is certainly in southern Minnesota and is a growing problem in that area,” says Jeff Stachler, Ph.D., Extension weed scientist at North Dakota State University and University of Minnesota. “Corn and soybeans are the main crops in southern Minnesota, which is why there is so much resistance. It is also present in the southern Red River Valley, and we expect it to become a problem in southeastern North Dakota as well.”

Growers on the Plains are accustomed to managing other resistant weed species, such as ALS-resistant kochia and Russian thistle. Resistant waterhemp, however, may be a much greater challenge. “It already is a huge issue for soybean and corn growers,” Stachler says. “Waterhemp produces large quantities of seed, and there are limited herbicide options.”

In fact, waterhemp was among the first weeds documented to be resistant to multiple modes of action – ALS-, HPPD-, PSII- and PPO-inhibitors and glyphosate.

"A fifth example of resistance in one weed species is overwhelming evidence that resistance to virtually any herbicide used extensively on this species is possible," says Aaron Hager, Ph.D., Extension weed specialist at the University of Illinois. “Waterhemp is not a weed species that can be adequately managed with one or two different herbicides. This troublesome weed requires a much more integrated approach.”

Crop rotation patterns in and near the southern Red River Valley exacerbate the problem. Many growers plant Roundup Ready® corn, soybeans and sugarbeets in succession, with no break in the glyphosate cycle. Continuous exposure to a single mode of action places significant selection pressure on waterhemp and other weeds, increasing the likelihood of selecting glyphosate-resistant weeds.

“There may not be much resistant waterhemp here yet,” says Kevin Thorsness, technical service representative for Bayer CropScience in North Dakota. “But as we continue to plant more and more Roundup Ready corn, soybeans and sugarbeets in southeastern North Dakota, it’s only a matter of time before we see development of waterhemp resistance to glyphosate.”

Wheat and other small grains have always been good rotation crops, for multiple agronomic reasons. They also can be helpful in breaking up the glyphosate cycle and helping prevent waterhemp resistance. Controlling weeds in wheat with Huskie® herbicide from Bayer CropScience will reduce waterhemp pressure when growers rotate to other crops the following season.

With two modes of action, Huskie® herbicide from Bayer CropScience gives cereal growers effective, broad-spectrum weed control without relying on glyphosate. One mode of action inhibits an enzyme critical for plant pigmentation, resulting in the bleaching and rapid control of weeds. A second mode of action blocks photosynthetic processes. As a result, Huskie controls more than 50 hard-to-manage broadleaf species, including many that have become resistant to ALS inhibitors and provides partial control of 20 others.

Thorsness recommends having a good resistance-management program in place to avoid waterhemp resistance. “Don’t rely on a single technology, and possibly add LibertyLink® soybeans to the rotation,” he says. Rotate herbicide modes of action, not just crops. Remember, the best way to combat resistance is to play good offense.”

Bayer CropScience is a company committed to bringing new technology to the forefront of crop production. For questions concerning the availability and use of products, growers should visit their retailer, contact a local Bayer CropScience representative, or visit Bayer CropScience online at www.bayercropscience.us.

BCS-USA-2011-0186

#####

©2011 Bayer CropScience LP, 2 T.W. Alexander Drive, Research Triangle Park, NC 27709. Always read and follow label instructions. Bayer, the Bayer Cross, Huskie and LibertyLink are registered trademarks of Bayer. Roundup Ready is a registered trademark of Monsanto Technology, LLC. Huskie and the LibertyLink trait are not registered in all states. For additional product information call toll-free 1-866-99-BAYER (1-866-992-2937) or visit our website at www.bayercropscience.us.

Bayer CropScience LP is the U.S. business of Bayer CropScience AG.

About Bayer CropScience
Bayer is a global enterprise with core competencies in the fields of health care, nutrition and high-tech materials. Bayer CropScience AG, a subsidiary of Bayer AG with annual sales of about EUR 6.5 billion (2009), is one of the world’s leading innovative crop science companies in the areas of crop protection, non-agricultural pest control, seeds and traits. The company offers an outstanding range of products and extensive service backup for modern, sustainable agriculture and for non-agricultural applications. Bayer CropScience has a global workforce of 18,700 and is represented in more than 120 countries. This and further news is available at: www.press.bayercropscience.com.

Forward-looking statements
This article may contain forward-looking statements based on current assumptions and forecasts made by Bayer Group or subgroup management. Various known and unknown risks, uncertainties and other factors could lead to material differences between the actual future results, financial situation, development or performance of the company and the estimates given here. These factors include those discussed in Bayer’s public reports, which are available on the Bayer website at www.bayer.com. The company assumes no liability whatsoever to update these forward-looking statements or to conform them to future events or developments.

CRP1210 HUSKIE0016R00
BCS-USA-2011-0186

For more information, contact:

Heather Koehler
AdFarm
Tel: (308) 624-6060
Email: heather.koehler@adfarmonline.com

View all labels / MSDS

Copyright © Bayer CropScience