ANTAGONISMO IN VITRO DE AISLADOS BACTERIANOS DE FRESA COMERCIAL Y SILVESTRE VS. Botrytis cinerea Y Rhizopus stolonifer

Strawberry is a non-climacteric fruit, with a short postharvest life. The loss of fruit quality may be due, among other factors to damage caused by pathogens. Among the most common fungi are causing gray mold ( Botrytis cinerea ) and white rot ( Rhizopus stolonifer ) two phytopathogenic impact on their growth rate which allows you to colonize the surface of these caused major economic losses. An alternative to control damage in fruit postharvest pathogens using microbial antagonists may be present in the plant or fruit, but at low densities. In this study bacteria were isolated from leaf tissue and wild strawberry fruit (Duchesnea indicates Andr. Fock) and comercial strawberry. Those isolates that were selected had the highest percentages of inhibition of mycelial growth of both pathogens in vitro. We isolated a total of 32 strains of which 15 came from wild strawberry and 24 commercial strawberry. Only nine strains were obtained with biocontrol potential for one or both pathogens. The highest percentages of mycelial growth inhibition ranged from 67.1% and 81.7% for Botrytis cinerea and 45.5% to 73.2% for Rhizopus stolonifer . These were obtained from four isolates two of them from wild strawberry and the others from commercial strawberry, all with ability to control both pathogens.