Fumigant and Repellent Effects of Eucalyptus cinerea and Eucalyptus maidenii Essential Oils on Callosobruchus maculatus F. 1775 (Coleoptera: Bruchidae) and Sitophilus oryzae L. 1763 (Coleoptera: Curculionidae)

Abstract

Eucalyptus maidenii and Eucalyptus cinerea essential oils of were extracted by the drive technique with water vapor and analyzed by means of gas chromatography coupled to mass spectrometry. The results reveal that the monoterpene compounds are the majority (57.69 and 51.28%) compared to sesquiterpenes (37.14 and 23.07%), and the 1.8- cineole is the most represented (70, 89 and 71.93%), respectively for E. cinerea. and E. maidenii. In fumigation tests, after 24 hours of exposure, with a dose of 12.5μl/l, E. cinerea and E. maidenii caused 100% adult mortality in Sitophylus oryzae. The same mortality rate was achieved at a dose of 25μl/l, with adults of Callosobruchus maculatus. The adults of S. oryzae are more sensitive to E. cinerea and E. maidenii with respectively, LD50 = 8.45 μl/l and 8.95 μl/l, LD95 = 10.45μl/l and 11.62 μl/l, compared to C. maculatus, with LD50 = 11.75 μl/l and 12.35 μl/l, and LD95 = 26.90 μl/l and 19.07μl/l for, respectively, E. cinerea and E. maidenii essential oils.