In vivo interactive effect of root-rot pathogen and root-knot nematode on Solanum melongena L.

Interactive effect of root-knot nematode (Meloidogyne incognita) and root- rot fungus (Macrophomina phaseolina) was evaluated at different inoculum levels on eggplant. Results showed that with the increase in time interval as well as inoculums level, there was corresponding increase in root-rot indices. At the highest inoculum (4g) mycelia mat/pot after 15 days of inoculation, there was complete wilting of all the lowest leaves and terminal portion of stem. In general, lethal effects on eggplant were observed at 2 g mycelia mat/500g soil, wherein slight drooping of lower leaves was recorded after 30 days of inoculation. Pathogenicity of M. incognita was also tested on eggplant. An initial inoculum level of 1000j2/500g soil caused significant reduction in plant growth characters and 2j2/g soil was found to be threshold level. Both the pathogens simultaneously or 10 days prior to other one revealed early expression of rot symptoms in the treatments whereas fungus and nematode were inoculated simultaneously (N + F) or nematode was inoculated 10 days prior to fungus (N + F10).

کلیدواژه ها:

Interaction ، Macrophomina phaseolina ، Meloidogyne incognita ، Pathogenicity ، Solanum melongena L