Learn about the long-term Ontario research on cover crop impacts on yields and economics and about cover crop selection and termination. Anne Verhallen, Mike Cowbrough, OMAFRA

1. Weed Management
Considerations with
Cover Crops
Mike Cowbrough, OMAFRA
519-820-2336
@cowbrough

5. CONS:
ANNUAL RYEGRASS (ARS)
•ARS must cross pollinate in order to
produce seed.
•If each parent had different low level
resistance mechanisms, the offspring
would be resistant and possibly have
two mechanisms of resistance.
Dr. Tardif (UofG)

6. •Studies have shown that ARS could go
from a susceptible population to a highly
resistant one in as few as 5 generations.
• It also takes more herbicide to control
than cereal covers (oats, rye etc)
Dr. Tardif (UofG)
CONS:
ANNUAL RYEGRASS (ARS)

7. Sikkema photo from twitter on
control options for ARS

8. Eragon (60 mL/acre) + Merge
(400 mL/acre), applied prior to
wheat emergence

9. POST apps:
1.Infinty
2.Infinity FX
3.Pixxaro UN-SPRAYED

10. After wheat: Wellington County -Sept, 2013
Estimate: 58 million seeds/ac

11. Oat cover crop (~50 lbs/acre) after wheat - 2016

12. No cover crop after wheat

14. After wheat harvest: Red clover cover crop
Estimate: 54,000 seeds/ac

15. MCPA ESTER 600
at 500 mL/acre
UN-SPRAYED

19. At our Norfolk County site, population
densities were ~4 million plants/acre

21. After tillage – Fall 2016

22. CEREAL RYE

27. Small rosettes = easy killing

32. Cereal Rye – 40 lbs/acre, seeded mid-December
Stand on May 24th, slated for black beans…

33. Warren Schneckenburger
Cedar Lodge Farms, Morrisburg, ON

34. Picture (November 2018) by:
Warren Schneckenburger
Cedar Lodge Farms, Morrisburg, ON

35. Cereal Rye – Fleabane
Suppression (Ann Vermeersch)
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