Abstract
SummaryEight fungicides (benodanil, carboxin, cyproconazole, fenpropimorph, fur‐mecyclox, iprodione, pencycuron and tolclofos‐methyl) were evaluated, under growth chamber conditions, as seed treatments against pre‐emergence damping‐off 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 post‐emergence 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 ≤ 0.05) among cultivars within a Brassica species.
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