Survival of Pseudomonas aeruginosa in various carriers for the inhibition of root rot-root knot disease complex of mungbean

Abstract

The survival of Pseudomonas aeruginosa strain 78 was tested on mungbean seeds coated with a variety
of substrates/carriers and was found best on talc amended with carboxymethyl cellulose or on gum arabic. Albizia
saman- and Cordia myxa-gum gave poor survival. On all substrates the antagonist populations declined dramatically
at 120 days after coating. In the repeating experiments, a seed coating with talc-based inoculum of the antagonist
caused marked reduction in nematode population densities in the soil and roots and also reduced subsequent
root-knot development due to Meloidogyne javanica, the root-knot nematode. However, the incidence of the rootinfecting
fungi Macrophomina phaseolina and Rhizoctonia solani did not differ significantly from the controls. Strain
78 significantly promoted growth with increased Bradyrhizobium-nodules in mungbean.