Viabilidade de escleródios de Sclerotinia sclerotiorum e incidência de fungos antagonistas em solo de Cerrado

ABSTRACT The viability of sclerotia of Sclerotinia sclerotiorum was assessedfor eight months in three cultivated Cerrado soils. Sclerotia producedin vitro were placed in nylon mesh bags and buried 5 cm deep in soilseither previously treated or untreated with methyl bromide. After 10days of incubation, sclerotia were retrieved and were examined forviability and presence of antagonistic fungi. Viability was assessedbased on the number of sclerotia germinated after a 7-day incubationperiod on semi-selective Neon-S medium. Viability of the sclerotia Ferraz, L.C.L.; Nasser, L.C.B.; Cafe-Filho, A.C. Viability of sclerotia of Sclerotinia sclerotiorum and incidence of antagonistic fungi in Cerradosoils. Summa Phytopathologica, v.37, n.4, p.208-210, 2011. varied among Cerrado soils. Sclerotia from soils not treated withmethyl bromide were less viable and were often contaminated byantagonistic fungi, indicating the presence of suppressive elementsof biological origin in the untreated Cerrado soils.