Biotoxicity of some ornamental leaf extracts against Meloidogyne incognita

In vitro experiments were conducted to know the efficacy of ornamental leaf extracts of Catharanthus roseus, Callistemon lanceolatus, Dandelion sp. and Chrysanthemum sp. in different concentrations (250, 500, 1000 and 2000 ppm) for the management of J₂ of root- knot nematode, Meloidogyne incognita. Extracts of Catharanthus roseus and Dandelion sp. @ 2000 ppm were found most effective followed by Chrysanthemum sp. and Callistemon lanceolatus. On the basis of LC₅₀ values, 250 ppm of C. roseus, 440 ppm of C. lanceolatus, 860 ppm of Dandelion sp. and 1550 ppm of Chrysanthemum sp. were found effective after 24 h against J₂ of Meloidogyne incognita.