Studies on aqueous extract of different parts of Tagetes erecta on hatching, larval mortality and larval penetration of Meloidogyne javanica

In vitro aqueous extract prepared from different plant parts of Tagetes erecta (cv. crackjack) inhibited the egg hatching of Meloidogyne javanica. However, extract obtained from roots was most effective. Egg hatching was inversely proportional to extract concentraction and directly porportional to exposure time. Larval mortality was also maximum in root extract, which decreased with increase in dilution. But, it increased with increase in duration of exposure time.