Canola volunteers with resistance to more than one herbicide are probably more common than you think. If you’ve only grown Liberty Link canola, for example, but your pre-seed glyphosate treatment doesn’t seem to be getting all the volunteers, the volunteers may have resistance to both Liberty and glyphosate…
Weeds
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Nutrient carryover is a common question from growers with unseeded acres. The standard answer is: Nitrogen is always variable throughout a field, and after a wet year without a crop, reserves might actually be better on the hilltops than in low spots. In low areas flooded for long periods, lack of oxygen limits microbial breakdown of organic matter. Therefore nutrients…
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Read on for tips to reduce the risk of selecting for resistant weeds on your farm…
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Lack of crop diversity can increase the density of pests in a field. The higher the population of a pest in a field, the higher the risk of developing resistance to the pesticides (herbicide, fungicides or insecticides) used for controlling the pest in those fields…
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The success of herbicide tolerant canola technology to control weeds is one reason why canola rotations have tightened. Economical weed control has increased canola profits. But the reduction in crop diversity can allow some weeds (and insects and diseases) adapted to growing with canola to increase in density and intensity. This places increased pressure on the chemical tools used to…
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The opportunity to spray weeds is nearly closed for this fall, especially on fields planned for canola in 2012. If you have a stretch of warm sunny days in the forecast, you might have a chance to give dandelions one last hit…
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Growers considering tillage for fall weed control should clean equipment between fields to limit disease (and weed seed) spread. Tillage equipment carrying soil and stubble from field to field can also carry soil- and stubble-borne diseases such as clubroot and blackleg…
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If canola is not drying down after a Reglone application, the following may provide some insight as to why…