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Cool cloudy days after cool nights will result in lower herbicide efficacy than applications made in warm sunny days. Cloudy days don’t provide the photosynthetic activity required for many herbicides, including Group 10 glufosinate. And nights near freezing followed by days with highs that barely reach 10 C will not provide high metabolic activity required for best results from Group…
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In-crop weed control should occur as early as possible since canola is much more vulnerable to weed competition prior to reaching complete ground cover. Past research has demonstrated an advantage of 3 bu./ac. for controlling weeds at the 1-2 leaf stage of canola versus 3-4 leaf, and a 7 bu./ac. advantage versus 6-7 leaf. At $12 per bushel, that’s $36…
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No time to wait? Growers who want to do a preseed burnoff and then get seeding may not want to wait 3-4 days for the weeds to recover from a frost. In this situation, growers should recognize that if they go ahead and spray right away, efficacy may be reduced. However, even with the lower efficacy, doing the burnoff and…
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Adjuvant systems used in in-crop herbicides used in canola are very effective tank cleaners and will remove the smallest residue of herbicide remaining in the tank and deposit it in your sensitive canola crop…
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Seeding is a priority for many growers this week, but fields with a large population of weeds, especially advancing winter annuals, should get a pre-seed burnoff. For annuals and winter annuals, glyphosate needs only 24 hours to get to the growing point and set the control process in motion. After a day, the crop can be seeded. For perennial weeds,…
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Foxtail barley has proliferated in some fields that were unseeded last year due to excess moisture. If it’s in patches, tillage may be the best way to control it. Pre-seed applications when shoots are small and all energy is moving upward through the weed are not always that effective. Waiting until the foxtail barley is bolting may provide a better…
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Even if growers don’t expect to seed any time soon, they may want to consider a pre-seed burnoff now to get weeds at smaller stages and before they draw down moisture and nutrients that their canola crops will need…
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Herbicide carryover risk could be higher this year because some products may not have broken down as expected in 2011 due to extreme conditions. Also, with the increase in canola acres, some canola will go on land not planned for canola when growers made there herbicide decisions last year…
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Even if growers don’t expect to seed any time soon, they may want to consider a pre-seed burnoff now to get weeds at smaller stages and before they draw down moisture and nutrients that their canola crops will need. Products registered for use ahead of canola are CleanStart, Amitrol 240 and glyphosate…
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