Additive effect of three organic materials and nematicides on the reproduction of Meloidogyne incognita and yield of Mentha arvensis

Greenhouse trials were conducted to determine the influence of three organi c materials and two nematicides on reproduction of Meloidogyne incognita an d yield of Mentha arvensis. Maximum reduction in M. incognita populations o ccurred at high does of neem cake (Reproduction factor (Rf) = 0.64) followe d by Adhatoda vasica Nees leaf powder (Rf = 0.99 to 1.40), aldicarb (Rf = 1 .58), medium dose of neem cake (Rf = 1.70), carbofuran (Rf = 2.45), bavisti n (Rf - 3.38) and powdered leaf of Murraya koenigii (L.) Spreng (Rf = 3.71, 3.37), respectively. Maximum oil yield of menthol mint cv. Hy-77 was obtai ned in neem cake treated soil followed by powdered leaves of A. vasica, M. koenigii, aldicarb, carbofuran and bavistin. Similar results were recorded with dry root and shoot weights of the plant. A phytotoxic effect of higher doses of neem cake and M. koenigii leaf powder on menthol mint was observe d.