Understanding, Mitigating and Managing PPO Inhibitor (Group 14)-Resistant Kochia
- Research Topic: Insect/Disease/Weeds
- Back to Project Listing
In Canada, kochia can now exhibit resistance to up to five herbicide modes of action (including Groups 2, 4, 5 (in the USA), 9, and now, 14). Very few herbicide options remain to control multiple herbicide-resistant kochia, and the ones that are available have rather limited use cases.
This project aims to understand which of the remaining herbicide options are available, especially before crop planting, and what approach can lead to better stewardship of these remaining active ingredients to mitigate further selection for resistance to new modes of action.
Objectives (note: wherever PPO-inhibitor-resistant kochia is mentioned, this refers to Group 14 resistance):
- Determine cross-resistance to PPO-inhibiting herbicides in PPO-inhibitor-resistant kochia confirmed in SK.
- Determine cross- or multiple-resistance to other herbicide modes of action in PPO-inhibitor-resistant kochia.
- Determine the mechanism conferring resistance to PPO-inhibiting herbicides in kochia.
- Continue monitoring kochia survey samples for PPO-inhibitor resistance across the Canadian Prairies.
- Assess efficacy of alternative herbicides to manage multiple herbicide-resistant kochia prior to crop seeding.
- Determine the mid/long-term utility and sustainability of strategic tillage for kochia management.
- Assess the impact of timing and implement/depth of soil disturbance on kochia emergence, density, and the soil seedbank.
Determine the mid/long-term impact of winter cereals and perennials in crop rotations on multiple herbicide-resistant kochia.
Project Details
- Listing ID: 6337
- Project Status In Progress
- Principal Investigators Dr. Charles Geddes Agriculture and Agri-Food Canada Lethrbidge Research and Development Centre
- Projects With Results Projects with Results
- Project Dates 2024 – 2029
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Abstract/Summary
In Canada, kochia can now exhibit resistance to up to five herbicide modes of action (including Groups 2, 4, 5 (in the USA), 9, and now, 14). Very few herbicide options remain to control multiple herbicide-resistant kochia, and the ones that are available have rather limited use cases.
This project aims to understand which of the remaining herbicide options are available, especially before crop planting, and what approach can lead to better stewardship of these remaining active ingredients to mitigate further selection for resistance to new modes of action.
Objectives (note: wherever PPO-inhibitor-resistant kochia is mentioned, this refers to Group 14 resistance):
1. Determine cross-resistance to PPO-inhibiting herbicides in PPO-inhibitor-resistant kochia confirmed in SK.
2. Determine cross- or multiple-resistance to other herbicide modes of action in PPO-inhibitor-resistant kochia.
3. Determine the mechanism conferring resistance to PPO-inhibiting herbicides in kochia.
4. Continue monitoring kochia survey samples for PPO-inhibitor resistance across the Canadian Prairies.
5. Assess efficacy of alternative herbicides to manage multiple herbicide-resistant kochia prior to crop seeding.
6. Determine the mid/long-term utility and sustainability of strategic tillage for kochia management.
7. Assess the impact of timing and implement/depth of soil disturbance on kochia emergence, density, and the soil seedbank.
8. Determine the mid/long-term impact of winter cereals and perennials in crop rotations on multiple herbicide-resistant kochia.
