Herbicide-tolerant canola: weed control and yield comparisons in western Canada

Harker, K. Neil; Blackshaw, Robert E.; Kirkland, K. J.; Derksen, D. A.; Wall, David A.

doi:10.4141/p99-149

Cited by 46 publications

(47 citation statements)

References 18 publications

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“…Results from experimental studies confirmed that yields of HR canola were greater when treated with GLY, GLU, or IMI than with herbicides typically used in non-HR canola, particularly where difficult-to-control weed populations were competing with the crop (Harker et al 2000). Yields are often similar among GLY, GLU, and IMI-HR canola systems (Clayton et al 2004a, b;Harker et al 2004).…”

Section: Herbicide-resistant Crop Productivitymentioning

confidence: 89%

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A decade of herbicide-resistant crops in Canada

Beckie¹,

Harker²,

Hall³

et al. 2006

Can. J. Plant Sci.

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164

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-J. 2006. A decade of herbicide-resistant crops in Canada. Can. J. Plant Sci. 86: 1243-1264. This review examines some agronomic, economic, and environmental impacts of herbicide-resistant (HR) canola, soybean, corn, and wheat in Canada after 10 yr of growing HR cultivars. The rapid adoption of HR canola and soybean suggests a net economic benefit to farmers. HR crops often have improved weed management, greater yields or economic returns, and similar or reduced environmental impact compared with their non-HR crop counterparts. There are no marked changes in volunteer weed problems associated with these crops, except in zero-tillage systems when glyphosate is used alone to control canola volunteers. Although gene flow from glyphosate-HR canola to wild populations of bird's rape (Brassica rapa L.) in eastern Canada has been measured, enrichment of hybrid plants in such populations should only occur when and where herbicide selection pressure is applied. Weed shifts as a consequence of HR canola have been documented, but a reduction in weed species diversity has not been demonstrated. However, reliance on HR crops in rotations using the same mode-of-action herbicide and/or multiple in-crop herbicide applications over time can result in intense selection pressure for weed resistance and consequently, greater herbicide use in the future to control HR weed biotypes. History has repeatedly shown that cropping system diversity is the pillar of sustainable agriculture; stewardship of HR crops must adhere to this fundamental principle. L'adoption rapide du canola et du soja RH laisse croire que les agriculteurs y trouvent un net avantage économique. Les cultures RH ont souvent facilité la lutte contre les mauvaises herbes, accru le rendement ou les revenus tout en ayant un impact similaire voire plus faible que les cultures qui ne le sont pas sur l'environnement. On ne remarque pas de changement marqué au niveau de la repousse spontanée des adventices avec ces cultures, sauf dans les systèmes de non-travail du sol où l'on n'utilise que du glyphosate pour combattre la repousse spontanée du canola. Bien qu'on ait mesuré la transmission de gènes du canola résistant au glyphosate aux populations sauvages de navette (Brassica rapa L.) dans l'est du Canada, l'enrichissement de ces populations par des hybrides ne survient que si l'herbicide accentue la pression sélective. La littérature scientifique cite des cas où la population d'adventices change consécutivement à la culture de canola RH, mais on n'a pu démontrer l'appauvrissement de la diversité des espèces. Employer des cultures RH dans les assolements où l'on recourt à des herbicides ayant le même mode d'action ou applique une multitude d'herbicides peut néanmoins déboucher avec le temps sur une intense pression sélective qui favorisera les adventices plus résistantes, ce qui nécessitera éventuellement un usage plus intense d'herbicides pour lutter contre les biotypes RH. L'histoire a montré à maintes reprises que la variété des systèmes agricoles est la pierre angulaire ...

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Section: Herbicide-resistant Crop Productivitymentioning

confidence: 89%

“…Level of weed control (particularly grasses) is usually greater and percentage dockage is less for GLY-than GLU-or IMI-HR systems (Harker et al 2000(Harker et al , 2004.…”

Section: Weed Management Canolamentioning

confidence: 99%

A decade of herbicide-resistant crops in Canada

Beckie¹,

Harker²,

Hall³

et al. 2006

Can. J. Plant Sci.

Self Cite

164

147

View full text Add to dashboard Cite

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“…None of the imazamox treatments consistently reduced oilseed rape yields. Harker et al (2000) have also indicated that imazethapyr/imazamox treatment did not lead to noteable crop injuries in oilseed rape. Based on the visual observations and crop yield results, it can be concluded, that the herbicide doses used in the trials, did not have a negative effect on the growth of B. napus.…”

Section: Discussionmentioning

confidence: 99%

“…Harker et al (2000) have also reported about the good effect of imazamox against these species. The competition of weeds with oilseed rape depends upon the establishment of the crop and on the weather during early spring (Knott 1990).…”

Section: Haukkapää A-l Efficacy Of Imazamox In Spring Oilseed Rapementioning

confidence: 99%

“…The effect of imazamox against S. media was good or moderate, whereas the effect on V. arvensis, L. communis and F. convolvulus was not sufficient. In addition to the broadleaved weed species, imidazolinones control many annual grass species, including Avena fatua (Harker et al 2000, Monaco et al 2002. In this study only broadleaved weeds were assessed.…”

Section: Haukkapää A-l Efficacy Of Imazamox In Spring Oilseed Rapementioning

confidence: 99%

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Efficacy of imazamox in imidazolinone-resistant spring oilseed rape in Finland

Haukkapää¹,

Junnila²,

Eriksson³

et al. 2008

AFSci

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Imidazolinonies (IMIs) are a group of herbicides inhibiting acetolactate synthase (ALS) activity. They control the growth of many broadleaved weeds and annual grass species. Herbicide resistance against imidazolinonies has been transferred in some crop species, for example in Brassica napus. IMI-resistant oilseed rape cultivars have been developed by a mutation in ALS. They have been on the market for a few years, especially in North America. To determine if imazamox, an imidazolinone herbicide, and IMI-resistant oilseed rape cultivars are suitable for cultivation in Finland, we conducted four herbicide trials in three locations. We found, that imazamox had no negative effect on yield or oil quality characters of IMI-resistant oilseed rape. Some transient chlorosis was observed immediately after the treatment, but it was not apparent after a few days. The effects of imazamox against the most troublesome weeds in oilseed field in Finland, Chenopodium album and Galium spurium, were very good. Imazamox had good or moderate effects on Stellaria media, whereas its effects on Viola arvensis, Lapsana communis and Fallopia convolvulus were insufficient. If the total weed number was high or the emergence of oilseed rape was slow, the application of imazamox increased the yield of oilseed rape compared to untreated control. Our results suggest that imazamox is a good alternative in controlling weeds for Finnish oilseed fields. Therefore, it would be beneficial to transfer the IMI-resistance into Finnish oilseed and turnip rape lines.

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Testing row spacing and planting rate for fall‐planted spring canola in the southern United States

Wynne

Neely²,

Adams³

et al. 2020

Agronomy Journal

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Cultivar selection, planting rate, and row spacing are key considerations when planting canola (Brassica napus L.) and vary by region. Canola offers a possible solution for producers in Texas and the broader southern region looking for a winter rotational crop, but the lack of data on region-specific agronomic practices is a roadblock to adoption. Our objective was to identify the optimum row spacing and planting rate to achieve maximum seed and oil yield in fall-planted spring canola in the southern United States. Replicated studies were conducted at College Station and Perry, TX during the 2017-2018 winter growing season. Treatments included three row spacings (19, 38, and 76 cm), three planting rates (1.7, 3.4, and 5.1 kg ha −1 ), and two cultivars (HyCLASS 930 and HyCLASS 970). HyCLASS 970 outperformed HyCLASS 930 in all yield and seed parameters except seeds pod −1 and oil content at both locations. While row spacing had no effect on yield at College Station, a 15% reduction in seed and oil yield was observed at the widest row spacing at Perry. A cultivar × planting rate interaction at Perry showed yield declining for HyCLASS 930 as planting rate increased, while HyCLASS 970 showed no response. This suggests rates as low as 1.7 kg ha −1 , which is substantially lower than the rate commonly recommended (5.6 kg ha −1 ), can be used for fall-planted spring canola. High yield at Perry and lack of freeze damage suggest spring canola may be a good winter rotational crop for the southern United States.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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Herbicide-tolerant canola: weed control and yield comparisons in western Canada

Cited by 46 publications

References 18 publications

A decade of herbicide-resistant crops in Canada

A decade of herbicide-resistant crops in Canada

Efficacy of imazamox in imidazolinone-resistant spring oilseed rape in Finland

Testing row spacing and planting rate for fall‐planted spring canola in the southern United States

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