Control of sorghum seed-borne fungi and protection against soil-borne fungi through fungicide seed treatment

Este trabalho teve como objetivo avaliar a eficiência de alguns fungicidas no controle de fungos associados a sementes de sorgo cultivar CMS 182R e na proteção delas contra fungos do solo. A microbiota das sementes de sorgo, composta por Fusarium moniliforme, Penicillium spp., Alternaria tenuis, Cladosporium spp. e Phoma sorghina, foi patogênica a essas sementes, e os fungos Pythium aphanidermatum e Sclerotium rolfsii, infectantes do solo de monocultivo de sorgo, também se mostraram patogênicos. Os fungicidas captan, thiram, captan + thiabendazole, thiram + thiabendazole, iprodione + thiram e tolylfluanid foram os mais eficientes no controle não só de toda a microbiota das sementes, como também na proteção das sementes contra Pythium aphanidermatum e Sclerotium rolfsii.This work was carried out in order to evaluate the efficiency of several fungicides applied as seed dressing in the control of sorghum seed-borne fungi and the protection against soil-borne fungi. The seed-borne fungi Fusarium moniliforme, Penicillium spp., Alternaria tenuis, Cladosporium spp., Phoma sorghina and the soil-borne fungi Pythium aphanidermatum and Sclerotium rolfsii were pathogenic to sorghum seeds cultivar CMS 182R. The fungicides captan, thiram, captan + thiabendazole, thiram + thiabendazole, iprodione + thiram and tolylfluanid were the most efficient in the control of Fusarium moniliforme, Penicillium spp., Alternaria tenuis, Cladosporium spp., and Phoma sorghina associated to the seeds, as well as in the protection of the seeds against the soil-borne organisms Pythium aphanidermatum and Sclerotium rolfsii