Effects of Wild Rose (Rosa sp.) Crude Seed Extracts on Two Legume Aphids

  • Ikbal CHAIEB
  • Faouzi HAOUALA
Keywords: Acyrthosiphon pisum, Aphis fabae, Fatty acids, insecticidal activity, Rosa canina, Rosa dumetorum, Rosa pomifera, Rosa rubiginosa


Crude hexane seed extracts of four wild species of roses of Caninae Section: Rosa caninaL., Rosa dumetorum Thuiller., Rosa pomifera Herm. and Rosa rubiginosa L., from Kairouan and Bejaregions, were screened for their insecticidal activity on two aphid species: black bean aphid (Aphisfabae Scop.) and pea aphid (Acyrthosiphon pisum Scop.), feed on several cultivated species. Thecomposition of hexane seed extracts permitted to identify fifteen compounds. R. dumetorum wasricher in palmitic acid (7.1%), stearic acid (2.6%), oleic acid (22.2%). R. ruboginosa Kairouan regionwas richer in linoleic acid (52.8%) and R. pomifera was higher in linolenic acid (26.9%). Tests wereconducted using in vitro spraying of each rose seed extract at four doses: 0, 10, 20 and 40 mg ml-1.Results showed a bigger sensitivity of Aphis fabae to rose extracts. Indeed, at the dosis of 40 mg ml-1,the mortality varied from 25 to 47% for Aphis fabae and from 22 to 34% for Acyrthosiphon pisum.The maximum of mortality for the two aphid species was observed with hexane extracts of R.dumetorum. This insecticidal activity may be due to the presence of arachidic acid in the testedextracts.