Despite our best efforts, sometimes even the best laid weed control plans go wrong!
The first thing to remember is that not all weed escapes are created equal. In some cases, weeds can survive because of application timing issues, challenging weather conditions or late flushes that emerge after spraying. However, when weeds aren’t controlled by herbicide applications, herbicide resistance should also be on your radar.
A recent survey in Manitoba found that in fields with uncontrolled wild oats, 100 per cent of populations were resistant to Group 1 products, 82 per cent were resistant to Group 2 products, and 82 per cent were resistant to both Group 1 and 2 herbicides. Those numbers show how important it is to take a closer look at wild oat weed escapes.
Identifying why your herbicide failed to control wild oats is the first step toward finding a solution. Start by scouting the field to narrow down the cause. Consider factors such as application timing, weather conditions, late flushes after spraying and the size of the weeds when you sprayed. Look out for distribution patterns in the field that might suggest application issues, such as plugged nozzles, missed areas or poor coverage. If you’re able to rule out these causes, its time to consider herbicide resistance.
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