“…Pure culture of M. incognita (Kofoid and White, 1919) Chitwood, 1949 raised on Celosia argentea was extracted using the method of Hussey and Baker (1973), the extracted eggs and juveniles served as source of inoculums. Approximately 1000 eggs and juveniles per ml of M. incognita were inoculated around the base of each lettuce plant (Fabiyi et al, 2019) at four days after transplanting. The crude extracts, fractions and essential oil were applied a week after inoculation at 200 ml in variants of 50, 75 and 100 mg/ml, while the dry powder leaves used as soil amendment was applied at 150, 175 and 200 g. The reference standard check was carbofuran (a synthetic Fabiyi nematicide) applied at 0.5, 1.0 and 1.5 kg/ai/ha.…”