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US grower perceptions and experiences with glyphosate-resistant weeds
1Syngenta Crop Protection, Inc., Greensboro, NC 27419, USA. chuck.foresman@Syngenta.com
Pest Management Science
|February 5, 2008
Summary
Growers recognize the value of glyphosate-resistant (GR) crops but manage weed resistance reactively. Many southern growers have planted continuous GR crops, yet resistance management strategies are implemented only when necessary.
Area of Science:
- Agricultural Science
- Agronomy
- Weed Science
Background:
- Surveyed 400 US growers of maize, soybeans, and cotton in 2006.
- Focused on perceptions, experiences, and management of glyphosate-resistant weeds.
- Included growers from the northern (corn belt) and southern (cotton belt) US regions.
Purpose of the Study:
- To determine grower perceptions and experiences with glyphosate-resistant weeds.
- To understand current management practices for glyphosate-resistant weeds.
- To assess adoption of resistance management strategies.
Main Methods:
- Conducted a survey of 400 agricultural growers.
- Collected data on weed resistance perceptions and management.
- Analyzed responses from northern and southern US growers.
Main Results:
- 24% of northern and 39% of southern growers believed they had glyphosate-resistant weeds.
- 67% of southern growers had planted continuous glyphosate-resistant (GR) crops for 3-5 years.
- The primary method for managing glyphosate-resistant weeds was rotating to other herbicides.
Conclusions:
- Growers acknowledge the benefits of GR crop technology.
- Resistance management practices are adopted by growers on an as-needed basis.
- Proactive strategies for glyphosate-resistant weed management require further investigation.
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