Weed management
The following articles are categorized as 'Weed management'
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Tips from excess moisture meetings
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 made available through mineralization will be lower than expected in these low-lying areas. Leaching of nitrogen and sulphur and de-nitrification of nitrogen will be higher in those areas as well. Test saturated areas separately.
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Glyphosate resistant kochia found on Prairies. Now what?
Read on for tips to reduce the risk of selecting for resistant weeds on your farm.
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Rotations for pest resistance management
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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Rotations for weed management
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 manage these pests, thereby increasing the risk of resistance to those products. Consider rotating weed management practices.
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Fall weed control ahead of cereals, not canola
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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Clean equipment to limit disease spread
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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Why is desiccated canola not drying down?
If canola is not drying down after a Reglone application, the following may provide some insight as to why…
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What weeds will you be dealing with next year?
Growers don’t have much time left to control weeds in fields planned for canola next year. But if you saw higher numbers of key canola weeds, such as cleavers, in your cereal crops this year, make a plan now to control them.
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Don’t spray weeds right after frost
Post harvest weed control can be a valuable step in preparing fields for canola next year, especially if winter annuals and perennials are present in high numbers. Dandelions and thistles, for example, move a lot of energy into their roots this time of year, so fall is an effective time to control these weeds. Here are some tips to improve the success of fall weed control in fields planned for canola in 2012:
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