Effects of cyazofamid against Plasmodiophora brassicae Woronin on Chinese cabbage

Citations Over TimeTop 14% of 2003 papers

Abstract

Cyazofamid (4-chloro-2-cyano-N,N-dimethyl-5-p-tolylimidazole-1-sulfonamide) is a novel fungicide with high levels of activity against Oomycetes fungi and Plasmodiophora brassicae Woronin. The effects of cyazofamid were investigated against P. brassicae, the causal agent of clubroot disease in Chinese cabbage. Cyazofamid at 0.3 mg litre(-1) inhibited resting spore germination of this pathogen by about 80%. Cyazofamid at 3-10 mg litre(-1) exhibited fungicidal activity to resting spores of P. brassicae 1-10 days after treatment. When cyazofamid was applied to infested soil, both root-hair infections and club formation caused by P. brassicae were strongly inhibited at 1-3 mg kg(-1) dry soil. These results suggest that cyazofamid directly inhibits resting spore germination, thereby leading to the inhibition of root-hair infection and club formation. Cyazofamid at 3 mg kg(-1) dry soil also exhibited complete control of clubroot disease. The effect of broadcast soil application using a dust formulation at 2 kg AI ha(-1) (equivalent to 1.3 mg AI kg(-1) dry soil), and plug seedling tray application by a suspension concentrate formulation at 200 and 400 mg AI tray(-1) (30 x 60 x 4 cm3) against P. brassicae was also evaluated. Cyazofamid exhibited good efficacy against the pathogen. The sequential treatment including plug seedling tray application with cyazofamid and pre-plant broadcast soil application with the fungicide fluazinam also exhibited excellent levels of control. These results indicate that cyazofamid has a high potential to be an effective fungicide for the control of clubroot disease.

Related Papers

• → Characterization of isolates derived from single resting spores of Plasmodiophora brassicae and studies of their interaction(1982)76 cited
• → Screening of clubroot-resistant varieties and transfer of clubroot resistance genes to <i>Brassica napus</i> using distant hybridization(2018)55 cited
• → Pathotype Characterization of Plasmodiophora brassicae, the Cause of Clubroot in Central Europe and Sweden (2016–2020)(2022)17 cited
• → Spatiotemporal Quantification of Plasmodiophora brassicae Inoculum in Relation to Clubroot Development Under Inoculated and Naturally Infested Field Conditions(2021)8 cited
• → Production of Clubroot Standards Using a Recombinant Surrogate to Overcome Natural Genetic Variability(2023)