In vitro evaluation of nematicidal efficacy of the extracts of some botanicals and bioagents on egg hatching and larval mortality of juveniles of Meloidogyne incognita Race-1

An in-vitro testing was carried out to study the effect of various aqueous extract of certain plant products and bioagents on the egg hatching and mortality of second stage juveniles (J2) of Meloidogyne incognita. All the treatments were tested in two alternate concentrations of 5% and 10%. The bioagent, Paecilomyces lilacinus strongly inhibited the hatching of eggs of Meloidogyne incognita. Latex of Calotropis procera and aqueous extract of Datura metel @ 10% concentrations was found to possess highest nematicidal efficacy in terms of mortality of J2 of Meloidogyne incognita. Higher concentrations of the aqueous extract of Calotropis procera and the bioagent Paecilomyces lilacinus were at par with Datura metel.