Fungicidal control of damping‐off and seedling root rot in Brassica species caused by Rhizoctonia solani in the growth chamber*

Abstract

Eight fungicides (benodanil, carboxin, cyproconazole, fenpropimorph, furmecyclox, iprodione, pencycuron and tolclofos-methyl) were evaluated, under growth chamber conditions, as seed treatments against pre-emergence dampingoff and post-emergence seedling root rot in six Brassica species. Five cultivars of B. rapa, four cultivars of B. juncea, four cultivars of B. napus and one cultivar/ strain from each of B. carinata, B. nigra and B. oleracea were grown in soilless mix infested with an isolate of Rhizoctonia solani AG-2-1, B. nigra and B. juncea were considerably less susceptible to R. solani than the four other species. Cyproconazole at 0.05-0.1 g a.i./kg seed and the other fungicides at 2-4 g a.i./ kg seed provided almost complete control of pre-emergence damping-off in most Brassica species and their cultivars. Their efficacy varied against the postemergence seedling root rot. Furmecyclox, iprodione, tolclofos-methyl and pencycuron consistently gave good control of seedling root rot in all Brassica species and their cultivars. Benodanil and fenpropimorph provided moderate control, and carboxin and cyproconazole gave poor control against root rot. Efficacy of carboxin, cyproconazole, benodanil and fenopropimorph against seedling root rot varied significantly ( P G 0.05) among cultivars within a Brassica species.

Effect of seeding date and depth, seed size and fungicide treatment on Fusarium and Pythium seedling blight of canola

“…Sacc., and Pythium spp. are also important components of this disease complex (Berkenkamp and Vaartnou 1972;Ellis 1983;Calman et al 1986;Gugel et al 1987;Kataria and Verma 1992). Research on canola seedling blight has focussed almost exclusively on R. solani, while the impact of F. avenaceum and Pythium spp.…”

“…The effects of seeding date, seeding depth, seed size and seed treatment have been studied on Rhizoctonia seedling blight of canola (Nuttall 1982;Cotterill et al 1989;Kataria et al 1993;Hwang et al 2014). To our knowledge, however, no data are available on the effects of seeding date, seeding depth, seed size or seed treatment on canola seedling blight caused by F. avenaceum or Pythium spp.…”

“…In Canada, several fungicides have been evaluated for the control of preand post-emergence damping-off of canola caused by R. solani (Cotterill et al 1989;Kataria et al 1993). In western Canada, canola seed treatment fungicides are usually formulated to provide protection against a broad spectrum of fungal pathogens such as Pythium spp., Fusarium spp.…”

Synthesis and antifungal activity evaluation of new heterocycle containing amide derivatives

“…Fungicides inhibit the growth of pathogens and cause their eventual death by interfering in pathogen's respiration (Leroux 1996;Huang 2004). Furthermore, amide fungicides are usually efficient, safe and environmental friendly (Smiley et al 1990;Kataria et al 1993). Heterocycle compounds are very important for the development of fungicides.…”

The effect of seed size, seed treatment, seeding date and depth on Rhizoctonia seedling blight of canola

“…Fungicide seed treatments provide an effective means to reduce damage from seedling blight and root rot pathogens (Verma 1996). In Canada, several fungicides have been evaluated to control pre-and post-emergence damping-off canola resulting from infection by R. solani (Cotterill et al 1989;Kataria et al 1993). In western Canada, canola seed treatment fungicides are usually formulated to provide protection against a broad spectrum of fungal pathogens, including Pythium spp., Fusarium spp.…”