Effect of Phosphorus Concentration andGlomus intraradiceson Fusarium Crown and Root Rot of Tomatoes

Publisher Website
Google Scholar
Abstract
The effect of colonization of tomato roots by Glomus intraradices on population of Fusarium oxysporum f. sp. radicis-lycopersici and on crown and root rot development in relation to increasing P concentrations in the substrate was investigated. An increase of available P in the substrate as well as in the P content of roots and leaves had no effect on the population of F. o. f. sp. radicis-lycopersici and root necrosis but resulted in a decrease of the root colonization by G. intraradices. Only the presence of G. intraradices resulted in a significant decrease in the population of F. o. f. sp. radicis-lycopersici and root necrosis at all P concentrations. At all P concentrations, the presence of G. intraradices had no significant effect on the mean dry mass of plants, whereas a significant decrease in plant dry mass was observed for plants inoculated with F. o. f. sp. radicis-lycopersici. It is concluded that the improved P nutrition from the endomycorrhizal fungus cannot explain the observed limitation in disease and pathogen development.