Wild Oat resistance in Saskatchewan continues to grow
Latest herbicide resistance study shows major increases
During the summers of 2014 and 2015, Agriculture and Agri-Food Canada, led by Hugh J. Beckie, Scott W. Shirriff and Julia Y. Leeson conducted a herbicide resistance survey of 400 fields across the province of Saskatchewan. This was the third herbicide resistance survey conducted since 2000 (2003, 2009, and 2014/2015).
Seeds were collected from weeds in each field just prior to harvest for the purpose of testing for herbicide resistance. Wild oat (the most prevalent grass weed across most of Western Canada and of major concern regarding herbicide resistance) was collected from 301 fields.
Results show a dramatic increase in the number of fields with wild oat herbicide resistance to Group 1 and Group 2:
Group 2 Wild Oat resistance on the rise
Results indicate a sharp increase in the number of fields with group 2 resistance, which is not surprising considering more acres have been treated with group 2 wild oat chemistry in recent years.
Manitoba and Alberta results coming soon
Results from surveys conducted in 2016 for Manitoba and 2017 for Alberta are yet to be released, but researchers expect similar results (Western Producer article, 2017). A large % of barley, canola, pea and wheat acres in all provinces had a Group 1 or 2 applied in 2015 (Stratus Survey data):
Diversify your wild oat control with Group 3 and Group 8 herbicides
In 2015, Groups 1 and 2 were used to target wild oats on 74% of wheat acres, 61% of barley acres, 100% of pea acres and 42% of canola acres,2 resulting in tremendous selection pressure for the development of wild oat resistance.
Get the most out of pre-emergent, soil-residual herbicides from Gowan
Herbicide base layering is a key strategy for managing herbicide-resistant weeds. Avadex®, Fortress® and Edge® herbicides work well in most cropping situations—conventional tillage, min-till and zero-till for cereals, oilseeds and pulses.
Reasons to Use Soil Residual Herbicides
From increasing your yields to allowing greater flexibility in your herbicide application schedule, there are many benefits to applying Soil Residual Herbicides. Watch the video below to learn more about how Soil Residual Herbicides can work for you.
Choose the Right Base Layer Product
Determine which herbicide is right for your field, based on the weed problem and the type of crop.
|Group 1 or 2 Wild Oats||Broadleaf Weeds||No Resistance|
|Cereals + Pulses||Cereals||Cereals|
|Avadex Liquid EC||Fortress MicroActiv||Avadex Liquid EC|
|Avadex MicroActiv||Avadex MicroActiv|
|Oilseeds||Oilseeds + Pulses||Oilseeds + Pulses|
|Fortress MicroActiv||Edge Granular||Edge Granular|
|Treflan Liquid EC||Fortress MicroActiv|
|Treflan Microactiv||Treflan Liquid EC|
The pre-emergent yield advantage
Any early season competition from wild oats will reduce yields, even with as few as three plants per square metre (Ag Canada, Lacombe).
Timing of Wild Oats Removal
Source: Monsanto 4-year Independent Study.
The value of a base layer
Including Fortress can maximize yield with reduced early-season weed pressure. Plus the added bonus of more flexibility when timing your in-crop herbicide.
Yield and Wild Oat Control – Fortress in LibertyLink System
Very heavy wild oat pressure – over 350 plants/sq metre
Source: University of Saskatchewan Study. 2007.
Avadex MicroActive is a highly active, easy-to-apply, granular herbicide that can be used in all types of tillage situations.Information Bulletin Product Labels
Avadex Liquid EC herbicide is a great option for spring application in conventional tillage situations.Information Bulletin Product Labels
Edge granular herbicide is a proven pre-emergent residual herbicide providing early weed removal and long-term control of grassy and broadleaf weeds.Information Bulletin Product Labels
Fortress has both Group 3 and Group 8 herbicides to provide control of wild oats, green and yellow foxtail, and suppression of certain annual broadleaf weeds.Information Bulletin Product Labels
Treflan® Liquid EC Herbicide is abroad-spectrum, residual, grassy and broadleaf weed herbicide specially suited for conventionally tilled fields with low amounts of crop residue.Information Bulletin Product Labels
Contact your local Gowan representative to find out how to add more diversity to your wild oat management program.
North and Central Alberta
Southern and Eastern Manitoba