Effects of fungicides and biofungicides on Rhizoctonia solani, a pathogen of pepper

In vitro and in vivo sensitivity of Rhizoctonia solani to several commercial fungicides and biofungicides was studied. An isolate of R. solani, derived from diseased pepper plants originating from a greenhouse in Knjaževac, Serbia, was used. The highest efficacy in R. solani control under greenhouse conditions was achieved by iprodione (95.80%, compared to control), although differences in the effectiveness of iprodione, tea tree oil, azoxystrobin and thiophanate-methyl were not statistically significant. The isolate was sensitive to all tested products in vitro. The obtained EC 50 s were: 0.43 mg/l for iprodione, 1.84 mg/l for thiophanate-methyl, 13.84 mg/l for prochloraz, 430.37 mg/l for fluopyram, 596.60 mg/l for azoxystrobin, and 496.79 mg/l for tea tree oil.