The effectiveness of four fungicides applied through irrigation water to control white mould of common beans (Phaseolus vulgaris) was evaluated in Viçosa, MG. The trial was installed on April in a naturally infested field with sclerotia of Sclerotinia sclerotiorum. The following fungicides and rates of active ingredient per hectare were tested: benomyl (1.0 kg), iprodione (0.75 kg), procymidone (0.5 kg), and fluazinam (0.5 l). Simulating sprinkler irrigation, fungicides were applied with watering-cans over the plants at 39 and 52 days after emergence (DAE) with water volume of 35,000 l/ha. At these two periods, fluazinam was also applied by a backpack sprayer (667 l/ha) or with watering-cans (35,000 l/ha) between the rows and near the soil surface. The last treatment was to verify the fluazinam effect on white mould control when applied on the soil surface. An untreated plot was also included. After harvest, seed transmission of the pathogen was evaluated. Fluazinam (applied either by backpack sprayer or through irrigation water onto plants), benomyl, and procymidone were the most efficient fungicides for white mould control. Among them, only procymidone did not provide yield higher than that of control. Fluazinam applied only on soil reduced white mould incidence and the amount of sclerotia produced. Yields varied from 1,406 kg/ha (control) to 2,054 kg/ha (fluazinam applied by backpack sprayer). There was no effect of treatments on the pathogen seed transmission, which varied from 0.25% (procymidone) to 1.08% (fluazinam applied only on the soil).
