cited By 14International audienceThe fumigant toxic effect of some monoterpenoids : α-pinene, linalol, carvacrol, eugenol, p-cymène, cinnamaldehyde, anethole, terpineol and cuminalde-hyde, was tested upon Rhopalosiphum padi and Ceratitis capitata. The sensitivity of both species to these compounds appears to be variable. The aldehyde and methoxyled monoterpenoids (cinnamaldehyde, cuminaldehyde and anethole) revealed to be more active than hydrogenated o es (α-pinene and p-cymene). The phenolic monoterpenoids present a great activity especially upon C. capitata