SARDA Ag Research News
Herbicide Resistant Wild Oat Herbicide Demo in Wheat-Donnelly 2021
By Calvin Yoder, Forage Seed Specialist (SARDA Ag Research/Peace Region Forage Seed Association) and Kristina Polziehn (Axiom Agronomy Ltd.)
Background
of wild oats there were resistant to group 1 herbicide, quizalofop-p-ethyl (commonly known as Assure II). Puma Advance (fenoxaprop-p-ethyl) a group 1 graminicide, had been sprayed on wheat the previous year. Samples of wild oat seed were collected and sent to Ag-Quest, a lab in Manitoba that specializes in testing for herbicide resistant weeds. The results showed: • 97% resistant to fenoxaprop-ethyl (Puma Advance) • 31 % resistant to pinoxaden (Axial) • 5% resistant to clethodim (Centurion)
W
ild oat resistance to Group 1 and Group 2 herbicides in Peace Region crops is not new, but it appears the issue is growing over the past few years. Continual use of herbicides with the same mode of action combined with poorly competitive crops, due to extremely wet weather in 2020 and drought conditions in 2021, has provided opportunities for wild oat resistance to develop. We are fortunate in the Peace Country that we are a little behind the rest of western Canada in terms of this problem, but that will change quickly if problem fields are not identified and management practices implemented. In 2020, a SARDA Ag Research fababean research site contained an extremely high and uniform patch
Methods 10
The area used to conduct pre-seed and in-crop wild oat herbicide trials had very uniform populations
