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During a survey of Karachi and its suberbs from the roots of leguminous plants different Rhizobium and Bradyrhizzobium species viz., Rhizobium sp. (Prosopis isolate), Bradyrhzobium sp., (sesbania isolate), Bradyrhizobium japonicum (soybean isolate), Bradyrhizobium sp. (sesbania isolate), Rhzobium meliloti (Melitotus indicus isolate) were isolated and identified. Culture filtrates of Rhizobium species showed nematicidal effects reduced hatching of eggs of root knot nematode. Rhzobium meliloti (Melilotus isolate1) showed maximum reduction in egg hatching (59%) followed by Bradyrhizobium sp. (Sesbania isolate1) which showed 30% reduction in egg hatching. Rhizobium species (Cymopsis isolate) exerted maximum lethal effects (100%) followed by Bradyrhizobium japonicum (Soybean isolate 4) and Rhizobium species (Senna oxidentalis) resulted in the (95%) juveniles’ mortality. Killing of second stage juveniles of M.javanica increased with an increase of exposure time. Rhizobium species used as seed dressing for the control of root knot nematode, significantly reduced galling as well as improved plant growth in mungbean. Among these isolates Rhzobium meliloti (Melilotus isolate 1) showed better growth whereas Rhizobium species (Senna oxidentalis) found effective against root knot development in all test crops.
Alyia Khan. (2006) SEED TREATMENT WITH NEMATICIDAL RHIZOBIUM SPECIES FOR THE SUPPRESSION OF MELOIDOGYNE JAVANICA ROOT INFECTION ON MUNGBEAN, , Volume 3, Issue 3.
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