The current study was conducted with the aim of evaluating the effects of crude terpene extracts of leaves and flowers collected from of Ammi majus on some aspects of the biological performance of Oryzaephilus surinamensis grain beetle. The results revealed that the crude terpene extract of flowers at concentrations of 10, 20 and 30 mg / ml had a significant effects on the cumulative mortality rate of the beetle’s different life stages. The highest mortality rate values reached (73.3, 46.7)% at the concentration 30 mg / ml after 72 hours treatment for the second larval instars and adults, respectively. While the mortality rates achieved from treatment with the same concentrations of the crude terpene leaf extract reached (53.3, 33.3)% after 72 hours for the second larval instars and adults.

This in vitro study evaluated the effects of crude alkaloid compounds extract of plant A. majus leaves and flowers on some biological performance aspects of the insect. The results showed that the alkaloid extract of flowers at concentrations of 10, 20 and 30 mg/ml significantly affected cumulative mortality at the different stages. The concentration ( 30) mg/ml had the most noticeable effects, causing the highest mortality rate in the second and fourth larval instars (86.7 and 73. 3 %, respectively) after 72 hours. At the same time, the mortality rates upon applying the same concentrations but of the alkaloid extract of the leaves were 73.3, and 53.3 %, respectively, following 72 hours of treatment. Keywords: Oryzaephilus surinamensis; Ammi majus; crude alkaloid compounds extract.