A dry summer and fall in certain areas of the Prairies created a high risk situation for herbicide carryover this spring. High spring moisture from increased snow fall will not help much because microbial activity does not occur, no matter the soil moisture level, until soil temperatures are 5°C and then only increase marginally until soils are warm. If little…
Weeds
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Both of these trays were seeded with kochia and then sprayed with glyphosate after emergence. The difference: The tray in front was seeded with glyphosate-resistant kochia seeds. Glyphosate resistant kochia is spreading and most kochia on the Prairies is already Group 2 resistant. For good long-term management and prevention of glyphosate-tolerant kochia escapes, use a rotation of broadleaf control products…
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Cereals offer a wide range of pre-seed herbicide options to get rid of canola volunteers, which may be plentiful this spring after the wind losses last fall. Volunteer canola competes with the crop for nutrients and water and sunlight, and also act a bridge for blackleg, clubroot, seedling diseases and insects, reducing the effectiveness of crop rotation…
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Growers who do not have the time for timely scouting may want to hire an agronomist to support their own scouting program. Most agronomists are also pressed for time, and may not be able to spend one to 2 hours a week scouting each canola field, but agronomists can supplement the time growers spend scouting, and provide experience and skills…
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It has been a very dry two months, as the map shows. Several products with high carryover risk are broken down almost exclusively through hydrolysis — the process of water splitting the herbicide molecule in two. Hydrolytic breakdown of herbicides decreases in drought, as you can imagine, and adsorption of herbicide to soil particles is increased, both of which will…
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Dry soils will be difficult to penetrate, and tillage will destroy standing stubble and its snow-catching capability. We can’t predict winter weather, but this extra moisture may be valuable next spring. Turning the soil can also cause a heavy flush of weeds from long buried seeds that have lost their dormancy, and burial of weed seeds and shattered canola seed…
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