EFFECT OF SOME IMPORTANT PLANT EXTRACTS AGAINST ROOT-KNOT (Meloidogyne javanica) OF TOMATO

Abstract

Plant extracts like Bashak (Adhatoda vasica), Pineapple (Ananas sp.), Mustard oil cake (Brassica campestris), Neem (Azadirachta indica), Marigold (Tagetes patula), Dholkalmi ([pomoea fistulosa) and rhizome extract of Ginger (Zingiber officinale) were used against root-knot of tomato caused by Meloidogyne javanica followed by seed treatment and root dipping method. Among the plant extracts, Bashak leaf extract gave the highest response followed by Pineapple extract in plant growth characters like length of shoot and root, fresh weight of shoot and root with corresponding lower galling incidence with the population of L2, L3, L4 and adult female of M. javanica in tomato. Mustard oil cake extract gave higher response followed by Neem leaf extract in plant growth and the lower galling as well as suppressed population of M. javanica. Marigold leaf extract showed lower response followed by Dholkalmi leaf extract to enhance plant growth and suppressing nematode activities within the treated plant. Rhizome of Ginger extract gave the lowest response in plant growth characters of tomato consequently with higher number of galls and nemic populations compared to control. All extracts performed better in root dipping method than any other extracts used in seed treated method. Negative correlations between galling incidence with shoot and root length, shoot and root weight as well as positive correlations between gall number with eggmass and adult female of tomato indicated the better action of plant extracts suppressing the nematode activity