Armazenamento de sementes de feijão revestidas com polímeros e tratadas com fungicidas

Abstract

Coating seeds with polymers associated with chemicals is used to promote a better fixation of seed treatment products, and therefore minimizing toxic hazards. The objective of this work was to verify the effect of four-month storage on quality of dry bean (Phaseolus vulgaris L.) seed coated with polymers, and treated with fungicides. Bean seeds were inoculated by immersion in a suspension of Colletotrichum lindemuthianum (5x10 5 conidia/mL), applied under vacuum. After the inoculation, seeds were treated with different types of fungicides: wettable powder, dry powder and concentrated suspension, applied either mixed or prior to polymer coating. Two different types of PVA paint were used as coating agent. Seed quality was evaluated through germination, vigor and pathological tests. Germination of coated and treated seeds was not affected during the storage period. The association of coating and a wettable powder treatment showed a higher germination percentage after two months of storage. The formulations wettable powder and concentrated suspension promoted a better control of the pathogens.