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The effectiveness of fungicides in controlling white mold (Sclerotinia sclerotiorum) of dry beans (Phaseolus vulgaris) was evaluated when they were applied through irrigation water directly onto the plants or only to the soil. Two field trials were installed in April 1998 and April 1999 in Viçosa, MG. Trials were conducted as a (2 x 3) + 1 factorial: two fungicides x three application modes + one untreated control. The fungicides were benomyl (1.0 kg a.i. ha-1) and fluazinam (0.5 l a.i. ha-1). The three application modes were: (a) by backpack sprayer (667 l ha-1), (b) by garden watering-cans simulating sprinkler irrigation with 35,000 l ha-1 of water, and (c) by garden watering-cans applying water between the rows and near the soil surface in 35,000 l ha-1 of water. In 1998, fungicides were applied at 43 and 54 days after emergence (DAE); in 1999, at 47 and 61 DAE. Both fungicides were similarly effective on white mold control when applied by either chemigation or backpack sprayer, resulting in yields 21% higher than untreated control. Only fluazinam provided disease control when applications were made only in soil. Chemigation provided white mold control equivalent to that of backpack sprayer in terms of incidence, severity and number of diseased pods. Consequently, yield differences between these application methods were not significant. O objetivo deste estudo foi avaliar a eficiência de fungicidas aplicados via água de irrigação sobre as plantas ou apenas no solo no controle do mofo-branco (Sclerotinia sclerotiorum) do feijoeiro (Phaseolus vulgaris). Dois experimentos foram instalados em abril de 1998 e de 1999, em Viçosa, MG. Os experimentos foram conduzidos num fatorial (2 x 3) + 1: dois fungicidas x três modos de aplicação + uma testemunha sem fungicida. Os fungicidas foram benomyl (1,0 kg ha-1) e fluazinam (0,5 l ha-1). Os três modos de aplicação foram: (a) com pulverizador costal (667 l ha-1), (b) com regador, simulando irrigação por aspersão com 35.000 l ha-1 de água, e (c) com regador, aplicando-se a água (35.000 l ha-1) entre as fileiras do feijoeiro e rente ao solo. Em 1998, os fungicidas foram aplicados aos 43 e 54 dias após a emergência (DAE); em 1999, aos 47 e 61 DAE. Ambos os fungicidas foram eficientes no controle do mofo-branco quando aplicados pela água de irrigação sobre as plantas ou por pulverizador, resultando em aumento de produtividade de 21%. Apenas fluazinam proporcionou controle da doença quando as aplicações foram feitas no solo. A quimigação proporcionou controle do mofo-branco semelhante ao obtido com o pulverizador em relação à incidência, à severidade e ao número de vagens doentes. Conseqüentemente, os rendimentos de feijão alcançados com os dois métodos de aplicação foram semelhantes

Chemigation with benomyl and fluazinam and their fungicidal effects in soil for white mold control on dry beans