Management of root-knot nematode, Meloidogyne javanica on vegetable crops with Tagetes sp

Aqueous extracts from 30 and 60 day-old marigold plants (Tagetes spp.) inhibited juvenile hatch considerably at all the concentrations compared to control. The juveniles hatched in 60 day-old plant extracts were immobile too. The extract without dilution had irreversible toxic effect and no hatching was observed in this treatment. Root exudates without dilution irrespective of the age of the plant, inhibited maximum hatch which decreased with the increase in dilution. Incorporation of chopped Tagetes leaves (40 and 80 g per kg soil) significantly increased tomato and brinjal plant growth and reduced number of galls, eggmasses and final juvenile population in soil.