Assessment of bait crops to reduce inoculum of clubroot (<i>Plasmodiophora brassicae</i>) of canola

AhmedH., U.; HwangS., F.; StrelkovS., E.; Gossen, B. D.; Peng, Gary; HowardR., J.; TurnbullG., D.

doi:10.4141/cjps10200

Cited by 47 publications

(46 citation statements)

References 27 publications

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“…In these trials, fungicide application generally had little or no impact on clubroot severity or crop yield . Fluazinam and cyazofamid were only effective where inoculum levels were low (Ahmed et al, 2011), and they were considered to be too expensive for commercial use. Quintozene consistently reduced clubroot severity and improved crop growth, even in severely infested soils (Hwang et al, 2008).…”

Section: Fungicidesmentioning

confidence: 99%

A comparison of clubroot development and management on canola and Brassica vegetables

Gossen

McDonald

Hwang

et al. 2013

Canadian Journal of Plant Pathology

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A comparison of clubroot development and management on canola and Brassica vegetables, Canadian Journal of Plant Pathology, 35:2, 175-191, Abstract: Clubroot of canola was identified for the first time on the Canadian prairies in 2003, and is spreading rapidly across the region.Although clubroot has been studied extensively on vegetable Brassica crops, it was not clear initially how much of the information would be directly transferable from the intensive production of vegetable crops to the extensive production practices used for canola. This review examines similarities and differences between clubroot development and management on vegetable crops and canola. One important difference was that clubroot generally has a larger economic impact on canola, which is harvested for seed, than on vegetables, especially those where early vegetative growth is the marketable component. Also, clubroot has spread within the production area more quickly than was expected based on vegetable production. This occurs in large part because the resting spores are readily moved within and between fields on the heavy machinery used for canola production, but movement of spores by wind and water is also being assessed. Interestingly, crop rotation to reduce yield losses may be a more viable approach for canola than in vegetable production. Resistance to clubroot is the most consistent and economically viable approach to clubroot management in canola, but several lines of evidence indicate that this resistance may not be durable. Fortunately, the large acreage of canola production in Canada ensures that new sources of resistance will be developed and deployed as existing sources are eroded. Pathogen development and cultural control are very similar on vegetables and canola; bait crops and soil amendments are generally not commercially viable in either system; and biocontrol has a limited potential at this time. Manipulation of seeding date, application of fungicide, and soil fumigation generally have more potential for use in vegetable production than for canola. Identification of approaches that reduce disease pressure in clubroot-infested fields and increase the durability and diversity of genes for clubroot resistance represent important lines of future research.Résumé: La hernie des crucifères a été détectée pour la première fois dans des cultures de canola sur les Prairies canadiennes en 2003. Cette maladie continue d'envahir la région à un rythme accéléré. Cette maladie a fait l'objet de nombreuses études chez les cultures maraîchères du genre Brassica et nous ne savions pas, initialement, quelles informations dérivées de la production intensive des cultures maraîchères seraient pertinentes pour la culture à grande échelle du canola. Cet article de synthèse examine les similitudes et les différences entre l'évolution et la gestion de la hernie chez les cultures maraîchères et le canola. Une différence importante est le plus grand impact économique de la hernie sur le canola, qui est cultivé pour sa graine, que sur les cultures mar...

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Section: Fungicidesmentioning

confidence: 99%

A comparison of clubroot development and management on canola and Brassica vegetables

Gossen

McDonald

Hwang

et al. 2013

Canadian Journal of Plant Pathology

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“…, 2001) on soil resting spore populations and subsequent clubroot severity is also being examined under greenhouse and field conditions. Resting spore populations and subsequent clubroot severity were often slightly reduced following two cycles of cruciferous crops, but the impact was generally small (Ahmed et al. , 2011).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the impact of resistant and susceptible canola on Plasmodiophora brassicae inoculum potential

et al. 2012

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The impact on clubroot severity of growing susceptible canola or mixtures of resistant and susceptible canola genotypes was examined. Bioassays revealed greater clubroot severity and incidence, and reduced plant height, where 100% of a susceptible cultivar had been grown. A higher proportion of susceptible plants within a resistant canola crop increased root hair and secondary infections. Regression analysis of root hair infection and the amount of Plasmodiophora brassicae DNA (as determined by quantitative PCR) revealed strong linear relationships between the two parameters. The linear relationships between root hair infection and P. brassicae DNA were stronger for the resistant cultivar than for the susceptible cultivar when regression analysis was conducted by cultivar over the sampling dates. In conclusion, the cropping of a resistant cultivar reduced clubroot severity, while the presence of susceptible volunteer canola increased inoculum potential. Quantitative PCR was a reliable tool for the quantification of root hair infection.

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“…They found that, under greenhouse conditions, resting spore concentrations and the corresponding disease severities were slightly reduced following two cycles of cmciferous bait crops (canola or Chinese cabbage) compared with noncmciferous crops (red clover, perennial ryegrass, orchardgrass, or bentgrass). However, bait crops had no effect on clubroot severity at two field locations where concentrations of resting spores were high (2). In a study examining the effect of seedling age on clubroot severity, Hwang et al (13) observed a reduction in clubroot severity as the age of inoculated seedlings increased from 1 to 4 weeks, indicating the potential ufility of seed treatment fungicides with a long residual period as disease management tools.…”

mentioning

confidence: 96%

“…Ahmed et al (2), for example, assessed the efficacy of bait crops to reduce the inoculum loads of P. brassicae resfing spores under field and greenhouse conditions. They found that, under greenhouse conditions, resting spore concentrations and the corresponding disease severities were slightly reduced following two cycles of cmciferous bait crops (canola or Chinese cabbage) compared with noncmciferous crops (red clover, perennial ryegrass, orchardgrass, or bentgrass).…”

mentioning

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Adaptation to Brassica Host Genotypes by a Single-Spore Isolate and Population of Plasmodiophora brassicae (Clubroot)

et al. 2012

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LeBoldus, J. M., Manolii, V. P., Turkington, T. K., and Strelkov, S. E. 2012. Adaptation to Brassica host genotypes by a single-spore isolate and population oí Plasmodiophora brassicae (clubroot). Plant Dis. 96:833-838.Plasmodiophora brassicae, the cause of clubroot of crucifers, is an increasingly important pathogen of canola (Brassica napus) in Alberta, Canada. In response, clubroot-resistant canola genotypes are being deployed to help reduce yield losses. Two experiments were conducted to examine the effect on P. brassicae virulence of repeated exposure of a population and single-spore isolate of the pathogen to the same host. The first experiment examined changes in the index of disease over five cycles of infection on seven Brassica hosts (European Clubroot Differential [ECD] 02, ECD 04, ECD 05, ECD 15, '45H26', '45H29', and 08N823R). The second experiment tested the virulence of five cycled populations ('45H29', 08N823R, ECD 05, and ECD 15) and three cycled single-spore isolates ('45H29', 08N823R, and ECD05) on four resistant canola genotypes {'13-11', '73-67', VT-SD-09, and '9558C'). The results from these experiments clearly demonstrate the ability of both single-spore isolates and populations of P. brassicae to rapidly erode the resistance present in the two canola genotypes, '45H29' and 08N823R. Although the index of disease increased on these two genotypes, the four resistant canola genotypes remained resistant to all the cycled populations and single-spore isolates in the second experiment. These results underscore the importance of crop rotation in the management of clubroot in Alberta.

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Assessment of bait crops to reduce inoculum of clubroot (Plasmodiophora brassicae) of canola

Cited by 47 publications

References 27 publications

A comparison of clubroot development and management on canola and Brassica vegetables

A comparison of clubroot development and management on canola and Brassica vegetables

Assessment of the impact of resistant and susceptible canola on Plasmodiophora brassicae inoculum potential

Adaptation to Brassica Host Genotypes by a Single-Spore Isolate and Population of Plasmodiophora brassicae (Clubroot)

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