SUPRESIVIDAD DEL COMPOST DE ORUJO DE VID FRENTE A MICOSIS EDÁFICAS DE PLÁNTULAS DE HORTALIZAS

Suppression of soil-borne diseases of horticultural crops by compost has been attributed to the activities of antagonistic microorganisms. A great diversity of biological control agents naturally colonize compost. This is especially true for biological control agents effective against the soilborne Oomycete pathogens. The purpose of this research was to determine the suppressive capacity of grape marc compost against Fusarium oxysporum f. sp. radicis-cucumerinum, Rhizoctonia solani, Pythium aphanidermatum and Phytophthora parasitica. Previously, antagonist in vitro assay were performed with 432 microbial morphologies isolated from grape marc compost. Seven microorganisms were selected for further bioassay with radish-Rhizoctonia solani, melon-Fusarium oxysporum f. sp. radicis-cucumerinum, and tomato-Phytophthora parasitica and two microorganisms for cucumber-Pythium aphanidermatum. Those experiments indicate, that grape marc compost reduce the severity of Pythium dumping-off on cucumber, but do not reduce the severity of Phytophthora root rot on tomato, Fusarium oxysporum f. sp. radicis-cucumerinum on melon and Rhizoctonia solani on radish. The enrichment of compost or vermiculite with the selected microbes for compost do not improved the suppressive effects.