Too windy. Too wet. Sometimes both. This pushed back a lot of weed management and some fields are still not sprayed. In this situation, intense weed pressure can reduce yields by 20%, 30%, 50%... That's why early weed control has a huge positive effect on profitability, but late control is better than nothing. Late control can stop the yield loss,…
Weeds
-
-
Unexpected carryover can occur when dry conditions in the year of application slow the expected pace of breakdown of herbicides. Unexpected residue damage is a risk any time a sprayer is left full while waiting for an opportunity to spray, or when sprayers are not effectively cleaned between crops and between products…
-
-
-
Injury from herbicide residue in the soil can only occur in fields with a history of Group 2, 4, 5 and 14 herbicide applications. While soil characteristics and dry conditions can extend the at-risk period for these herbicides, carryover issues often occur when required recropping intervals are not followed. For example, Roundup Ready or Liberty Link canola cannot be seeded…
-
-
One of our Alberta agronomy specialists encountered the situation in the photo. Canola emergence was patchy in this small area, but generally good overall. The bigger issue was the big population of tiny weeds. The agronomy specialist wondered if these buckwheat seedlings, though very abundant, were too small to spray? The answer is no…
-
-
Factors that affect herbicide carryover are herbicide group, field history, soil characteristics, dry conditions and temperature…