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Protocols for Robust Herbicide Resistance Testing in Different Weed Species
Published on: July 2, 2015
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Rate of herbicide resistant weed development: A Canadian Prairie case study.
Chelsea Sutherland1, Savannah Gleim1, Simona Lubieniechi1
1Department of Agricultural Economics, University of Saskatchewan, Saskatoon, Canada.
GM Crops & Food
|March 9, 2025
Summary
Genetically modified (GM) crop adoption in Canada shifted weed control from tillage to herbicides, increasing efficiency. Diverse crop rotations with GM crops help manage herbicide resistance, a key concern for farmers.
Area of Science:
- Agricultural Science
- Agronomy
- Plant Science
Background:
- Genetically modified (GM) crop adoption has significantly altered weed management practices in Canadian agriculture.
- The shift from conventional tillage to reduced or zero tillage systems is a direct consequence of increased weed control efficiency offered by GM crops.
- Canadian prairie crop rotations have diversified, moving from predominantly cereals to include pulses and oilseeds, impacting herbicide use patterns.
Purpose of the Study:
- To investigate the development of herbicide-resistant weeds in the Canadian Prairies.
- To analyze changes in herbicide resistance development trends after the widespread adoption of GM crops.
- To understand the implications of these changes for sustainable weed management strategies.
Main Methods:
- Case study approach examining weed resistance trends in the Canadian Prairies.
- Analysis of changes in tillage practices, crop rotations, and herbicide application volumes and rates.
- Evaluation of the relationship between GM crop adoption and the evolution of herbicide resistance in weed populations.
Main Results:
- GM crop adoption has led to a decline in tillage for weed control, favoring continuous cropping with reduced tillage.
- While total herbicide volume increased with crop acreage, the application rate per hectare has decreased.
- Diverse crop rotations, enabled by GM crops, facilitate the use of herbicides with varied modes of action, potentially slowing resistance development.
Conclusions:
- GM crops have facilitated a transition to more sustainable cropping systems with reduced tillage in the Canadian Prairies.
- Diverse rotations and strategic herbicide use are crucial for managing herbicide-resistant weeds, a significant challenge for crop production.
- Continued monitoring and adaptive management strategies are essential to mitigate the risks associated with herbicide resistance in agricultural landscapes.
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