Dr. Charles M. Geddes, Ph.D., P.Ag.

Image Charles M. Geddes
Research Scientist - Weed Ecology and Cropping Systems
  • Herbicide-resistant plants
  • Weed ecology, biology and management
  • Integrated weed management
  • Weed seedbank dynamics
  • Crop/weed interference
  • Long-term agroecosystem experiments

Current research and/or projects

16. Principal Investigator. Title "Old plots, new hypotheses: Toward a revitalized AAFC long-term agroecosystem experiment (LTAE) network." AAFC Management Solicited Initiative. 2019-2022.

15. Principal Investigator. Title "Development of an integrated weed management (IWM) package to mitigate and manage glyphosate-resistant weeds in soybean." WGRF, MPSG, CAP Ag Action MB Program. 2019-2024.

14. Principal Investigator. Title "Management of glyphosate-resistant kochia in western Canadian cropping systems." ICA Cluster - CAP, WGRF, MPSG, MWBGA, AAFC. 2018-2023.

13. Principal Investigator. Title "Weed seed-suppressive soils: Managing herbicide-resistant weed populations at the source." AAFC A-base. 2018-2021.

12. Co-Investigator. Title "Beneficial insects in Prairie crops: quantifying the value and vulnerability of biological pest control." AAF, AWC, AB, SWDC. 2019-2022.

11. Co-Investigator. Title "Development of improved protocols for the culture of arbuscular mycorrhizal fungi with high symbiotic potential according to the analyses of soil microbiome." AAFC A-base. 2018-2021.

10. Co-Investigator. Title "Delivery of an innovative winter wheat package to achieve sustainable wheat production in the Canadian Prairies." CNW Cluster - CAP. 2018-2023.

9. Co-Investigator. Title "Glyphosate-resistant kochia/Russian thistle surveys." WGRF. 2018-2023.

8. Co-Investigator. Title "Identifying agronomic and environmental benefits and drawbacks of diverse crops in cereal/canola/pulse crop rotations on the semi-arid Canadian Prairies. DFC Cluster - CAP. 2018-2023.

7. Co-Investigator. Title "Improving the management of sclerotinia stem rot of canola using fungicides and better risk assessment tools. CAR Cluster - CAP. 2018-2023.

6. Co-Investigator. Increasing the suitability of the Holos model for life cycle analysis through production cycle inputs, collaborative/open source development, and the development of representative farm systems. AAFC A-base. 2019-2022.

5. Co-Investigator. Integrating multiple beneficial management practices (BMPs) in an organic cropping system: Soil health, weed and insect interactions. AAFC A-base. 2018-2021.

4. Co-Investigator. Title "Long-term sustainable canola production - All phases rotations. WGRF, ACPC. 2017-2020.

3. Co-Investigator. Title "Manipulating agronomic factors for optimum canola harvest timing, productivity and crop sequencing." CAR Cluster - CAP. 2018-2023.

2. Co-Investigator. Title "Mitigating herbicide resistance - Investigating novel integrated weed maangement systems." WGRF, ACPC, ABC, SWDC. 2016-2021.

1. Co-Investigator. Title "The right balance: Management strategies for plugging organic soil health constraints and moving forward." OS Cluster III - CAP. 2018-2023.

 

Education and awards

Doctor of Philosophy (Plant Science), University of Manitoba, 2018

Bachelor of Science (Agroecology), University of Manitoba, 2012

Key publications

  1. Geddes, C.M.* 2024. Keynote address: Resistance management/survey update. Federated Co-operatives, Ltd. GrowActive Summit 2024. Saskatoon, SK. Mar 26-27, 2024. (Oral Presentation). Invited.

    2024 - View publication details

  2. Geddes, C.M.* 2024. Herbicide resistance diagnostics: where do they fit and how can they help? Farming Smarter Pesticide Applicators Workshop. Virtual. Mar 21, 2024. (Oral Presentation). Invited.

    2024 - View publication details

  3. Geddes, C.M.* 2024. Herbicide-resistant kochia. BarleyBin Live. Shaunavon, SK. Mar 13, 2024. (Oral Presentation/Discussion). Invited.

    2024 - View publication details

  4. https://agbio.usask.ca/soilsncrops/

    2024 - View publication details

  5. Alexander, B.*, Geddes, C.M., Larney, F., Chau, H., Janzen, H., Curtis A., Shade, K., and Schwinghamer, T. 2024. Soil health being tricky: Estimating unbiased causal effects of soil organic carbon on yield is a subjective experience. Soils and Crops 2024. Mar 05-06, 2024. Saskatoon, SK, USA. (Oral Presentation).

    2024 - View publication details

  6. Alexander, B.C.S.*, Geddes, C.M., Chau, H.W., Ellert, B.H., and Janzen, H.H. 2024. Beyond P-values: Analysis of spring wheat yields for a long-term study from 1968-2013 focused on no-tillage at Lethbridge, AB. Soils and Crops 2024. Mar 05-06, 2024. Saskatoon, SK, CA. (Poster Presentation).

    2024 - View publication details

  7. Tidemann BD, Innes G, Cock C, Geddes CM (2023) Developing a decision support system to aid in selection of multiple effective mode of action tank mixes. Western Society of Weed Science Annual Meeting, March 4 - 7, 2024. Denver, Colorado.

    2024 - View publication details

  8. Geddes, C.M.* 2024. Herbicide resistant weeds in the prairies. Top Crop Summit 2024. Saskatoon, SK. Feb 27-28, 2024. (Oral Presentation). Invited.

    2024 - View publication details

  9. Geddes, C.M.* 2024. New kochia research. Palliser Agricultural Management Society meeting. Virtual. Feb 07, 2024. (Oral Presentation). Invited.

    2024 - View publication details

  10. Geddes, C.M.* 2024. Protoporphyrinogen oxidase inhibitor (Group 14)-resistant kochia (Bassia scoparia) in Canada. 2024 Annual Meeting of the Weed Science Society of America. Jan 22-25, 2024. San Antonio, TX, USA. (Oral Presentation).

    2024 - View publication details

  11. Geddes, C.M.*, Dhariwal, G., Kennedy, L., and Pittman, M. 2024. Ile2041Asn substitution confers ACCase inhibitor resistance in foxtail barley (Hordeum jubatum). 2024 Annual Meeting of the Weed Science Society of America. Jan 22-25, 2024. San Antonio, TX, USA. (Poster Presentation).

    2024 - View publication details

  12. Geddes, C.M.* 2024. Keynote Address – part 2: Multiple herbicide-resistant kochia – A Canadian perspective, eh… 2024 Wild World of Weeds Workshop. North Dakota State University. Fargo, ND, USA. Jan 16, 2024. (Oral Presentation). Invited.

    2024 - View publication details

  13. Geddes, C.M.* 2024. Keynote Address – part 1: Herbicide-resistant weeds on the Canadian Prairies. 2024 Wild World of Weeds Workshop. North Dakota State University. Fargo, ND, USA. Jan 16, 2024. (Oral Presentation). Invited.

    2024 - View publication details

  14. Geddes, C.M.* 2024. Multiple herbicide-resistant kochia and the potential impact of PPO inhibitor (Group 14) resistance. 2024 Alberta Agronomy Update. Virtual. Jan 09, 2024. (Oral Presentation). Invited.

    2024 - View publication details

  15. Dhariwal, G., and Geddes, C.M.* 2024. Herbicide resistance diagnostics: Sampling, testing, and interpretation. 2024 Alberta Agronomy Update. Virtual. Jan 09, 2024. (Oral Presentation). Invited.

    2024 - View publication details

  16. Geddes, C.M., Pittman, M., Brown-Livingston, K.*, and Leeson, J. 2023. Manitoba survey of herbicide-resistant weeds in 2022. 2023 Manitoba Agronomists Conference. Dec 13-14, 2023. Winnipeg, MB, CA. (Poster Presentation).

    2023 - View publication details

  17. Geddes, C.M.*, Jayasekara, S., Anderson, M., Gulden, R., and Holzapfel, C. 2023. Weed suppression by integrating cultural tactics in western Canadian soybean production. 2023 Manitoba Agronomists Conference. Dec 13-14, 2023. Winnipeg, MB, CA. (Poster Presentation).

    2023 - View publication details

  18. Geddes, C.M.* 2023. Level up your herbicide resistance management plan. Saskatchewan Agronomy Research Update. Saskatoon, SK. Dec 12, 2023. (Oral Presentation). Invited.

    2023 - View publication details

  19. Geddes, C.M.* 2023. Herbicide-resistant weeds and the tragedy of short-term thinking. Canola Industry Meeting, Canola Week 2023. Calgary, AB. Dec 05, 2023. (Oral Presentation). Invited.

    2023 - View publication details

  20. Singh, K.D., Natarajan, M., Gill, K., Ravichandran, P., Wang. H., and Geddes, C.M., "Digital Imaging System for High-Throughput Plant Phenotyping using Raspberry Pi Computers", 13th Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS, IEEE), Athens, Greece, Oct.-Nov. 2023, https://doi.org/10.1109/WHISPERS61460.2023.10430815

    2023 - View publication details

Research facility

5403 1st Avenue South
Lethbridge, AB T1J 4B1
Canada

Affiliations

Alberta Institute of Agrologists (member)

American Society of Agronomy (member)

Crop Science Society of America (member)

Canadian Society of Agronomy (member)

Canadian Weed Science Society (member)

Weed Science Society of America (member)

Language

English