The isolates were previously grown on autoclaved rice during nine days in Petri dishes and further added to a commercial substrate (Baseplant) at 72 mg.kg-1, in pots (1 L) (Barbosa et al.,2010). Three peanut seeds previously surface-sterilized
(hypochlorite solution at 1.5%) were sown in each pot and daily watered. Two earliness-upright cultivars were used in this assay:Senegal 55 437, a Spanish type developed by International Crops Research Institute for the Semi-Arid-Tropics (ICRISAT), and BR 1, a Valencia type developed by Brazilian Company of Agricultural Research (EMBRAPA).