ABSTRACT :Lethal effects of bitter wood, thyme and myrrh aqueous extracts were evaluated against Meloidogyne incognita at concentrations of 20, 40, 60, 80 and 100% after 24h. and 48h. The results revealed that the mortality percent of M. incognita tended to with increasing the concentration. The effect of the three tested aqueous extracts slightly changed from 24 to 48 hours exposure. The probit analysis revealed that the heterogeneity of nematode response to myrrh was slightly higher than thyme and bitterwood. According to LC₉₅, LC₅₀ and LC₀₅ thyme achieved 147.7, 44.75 and 13.57%, respectively after 24 and 48 hours, no significant differences was observed between LC₉₅ of thyme (107.4%) and bitterwood (122.7%) but both differed significantly from myrrh (182.3%).