The methanolic extracts of Cleome gynandra (L.) Briq., Cleome chelidonii L., and Cleome viscosa L.
were tested against the rice weevil, Sitophilus oryzae L. under laboratory conditions. Impregnated-paper test with
the extracts (10μl/cm2
) were conducted on early emerged adults. The extracts of C. viscosa and C. gynandra
showed higher toxic than C. chelidonii extract . The LC50 values were 198, 988 and 1111 ppm, respectively.
Moreover, C. viscosa extract was highly inhibited the oviposition of these insects. The present result is an
indicative of the potential of using Cleome extracts for S. oryzae management.