Clubroot Control Using Brassica Break Crops

Cheah, L. H.; Gowers, S.; Marsh, A.T.

doi:10.17660/actahortic.2006.706.39

Cited by 12 publications

(6 citation statements)

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“…, 2006; rather than using them on their own. Used in combination with cultural/agronomic measures such as crop rotation (Wallenhammar, 1996; Cheah et al. , 2006) and soil amendment (Webster & Dixon, 1991a; Dixon & Page, 1998) that help reduce pathogen load in the soil or infection potential, may allow the natural products to reach their efficacy potential.…”

Section: Discussionmentioning

confidence: 99%

Potential biological control of clubroot on canola and crucifer vegetable crops

et al. 2010

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Clubroot caused by Plasmodiophora brassicae is an emerging threat to canola (Brassica napus) production in western Canada, and a serious disease on crucifer vegetable crops in eastern Canada. In this study, seven biological control agents and two fungicides were evaluated as soil drenches or seed treatments for control of clubroot. Under growth cabinet conditions, a soil-drench application of formulated biocontrol agents Bacillus subtilis and Gliocladium catenulatum reduced clubroot severity by more than 80% relative to pathogen-inoculated controls on a highly susceptible canola cultivar. This efficacy was similar to that of the fungicides fluazinam and cyazofamid. Under high disease pressure in greenhouse conditions, the biocontrol agents were less effective than the fungicides. Additionally, all of the treatments delivered as a seed coating were less effective than the soil drench. In field trials conducted in 2009, different treatments consisting of a commercial formulation of B. subtilis, G. catenulatum, fluazinam or cyazofamid were applied as an in-furrow drench at 500 L ha )1 water volume to one susceptible and one resistant cultivar at two sites seeded to canola in Alberta and one site of Chinese cabbage in Ontario. There was no substantial impact on the susceptible canola cultivar, but all of the treatments reduced clubroot on the susceptible cultivar of Chinese cabbage, lowering disease severity by 54-84%. There was a period of 4 weeks without rain after the canola was seeded, which likely contributed to the low treatment efficacy on canola. Under growth cabinet conditions, fluazinam and B. subtilis products became substantially less effective after 2 weeks in a dry soil, but cyazofamid retained its efficacy for at least 4 weeks.

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Section: Discussionmentioning

confidence: 99%

Potential biological control of clubroot on canola and crucifer vegetable crops

et al. 2010

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“…Since B. rapa reduced the mean clubroot severity on cauliflower root systems better than B. napus and also had higher quantities of total isothiocyanates, the authors speculated that these GSL breakdown products were involved in clubroot control (Cheah et al 2006). However, the effect was not attributed to a specific glucosinolate.…”

Section: Role Of Aliphatic and Aromatic Gsl During Clubrootmentioning

confidence: 99%

Glucosinolates and the clubroot disease: defense compounds or auxin precursors?

Ludwig‐Müller

2008

Phytochem Rev

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The clubroot disease is caused by the obligate biotrophic protist Plasmodiophora brassicae and is one of the most damaging for the family of Brassicaceae. Since many economically important crops belong to this plant family, the understanding of mechanisms how the disease is developing, are of high importance. Glucosinolates, a group of secondary plant products in the family of Brassicaceae, have long been associated with clubroot disease symptoms. Measurements showed that several glucosinolates are induced in root galls. While aliphatic glucosinolates are regarded as defense compounds, analysis of Brassica cultivars as well as Arabidopsis thaliana mutants provided correlative evidence between disease severity and indole glucosinolate content. The latter have been discussed as precursors for auxin biosynthesis. Since high auxin levels are associated with large root galls, indole glucosinolates could contribute directly or indirectly to the extent of disease development. Transcriptome and proteome experiments have revealed evidence for the involvement of genes from the glucosinolate and auxin pathway in gall formation. These data have been complemented by expression and mutant analysis. It can be concluded that regulation of glucosinolate and IAA biosynthesis might differ in Brassica and Arabidopsis.

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“…In order to improve the efficiency of the biocontrol agents under high disease pressure, it will be necessary to develop an integrated disease management system (Donald et al 2006). Indeed, better efficiency could be achieved by the combination of biocontrol agents and other control measures, such as a resistant cultivar, crop rotation (Wallenhammar 1996;Cheah et al 2006), seeding date selection (McDonald and Westerveld 2008), soil (Webster and Dixon 1991a, b;Dixon and Page 1998), chemical control (Suzuki et al 1995;Takeshi et al 2004), and other biological control measures (Narisawa et al 1998;Cheah et al 2006). Therefore, further studies should be performed to examine the combined effect of the three bacterial isolates and other measures under high disease pressure.…”

Section: Discussionmentioning

confidence: 99%

Isolation and characterization of bacterial isolates for biological control of clubroot on Chinese cabbage

Zhou

Zhang

et al. 2014

Eur J Plant Pathol

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Clubroot caused by Plasmodiophora brassicae is becoming an emerging threat to the production of crucifer vegetable crops in China. The aim of this study was to develop an effective biocontrol strategy against clubroot of Chinese cabbage. Results indicated that six out of fourteen bacterial strains that were isolated from vegetable rhizosphere soil reduced disease severity of Chinese cabbage by more than 50.% under greenhouse conditions.In greenhouse experiments, a soil-drench application of strain YFY 02, 13-1 and HY cell-free culture filtrate reduced the clubroot by 37.7-74.6 % relative to pathogen post-inoculation control on the highly susceptible Chinese cabbage cultivar. Seed treatment of strain YFY 02, 13-1 and HY cell-free culture filtrate reduced clubroot by 23.8-56.0 % in greenhouse experiments. In two field trials conducted at Tonghai and Lufeng sites, cell-free culture filtrates of three isolates reduced clubroot severity on Chinese cabbage by 62.4-76.8 % and 79.4 % -85.1 %, respectively. This efficacy was similar to fungicide Cyazofamid. Based on the sequence analysis of the 16S rDNA gene and identification of biochemical and physiologica criteria l(Biolog carbon source utilization analysis), the strains YFY 02 and HY were identified as Lysobacter antibioticus. To our knowledge, this is the first report of L. antibioticus strains being a promising candidate as a biological control agent against clubroot.

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Clubroot Control Using Brassica Break Crops

Cited by 12 publications

References 0 publications

Potential biological control of clubroot on canola and crucifer vegetable crops

Potential biological control of clubroot on canola and crucifer vegetable crops

Glucosinolates and the clubroot disease: defense compounds or auxin precursors?

Isolation and characterization of bacterial isolates for biological control of clubroot on Chinese cabbage

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