Insecticidal activity of essential oils of pelargonium graveolens l'Herit and Lippia alba (Mill) N. E. Brown against spodoptera frugiperda (J. E. Smith)

摘要

Insecticidal activity of essential oils of Pelargonium graveolens, Lippia alba and compounds geraniol, linalool, 1,8-cineole, limonene, carvone, citral and Azamax? were evaluated against Spodoptera frugiperda. Topical application assay showed essential oil of P. graveolens has acute toxicity against Spodoptera frugiperda larvae (third instar) with LD_(50) 1.13 μg/mg per insect and LD_(90) 2.56 μg/mg per insect. Three essential oils of L. alba also exhibited insecticidal activity with LD_(50) ranging from 1.20 to 1.56 μg/mg per insect and LD_(90) from 2.60 to 3.75 μg/mg per insect. Geraniol, linalool, carvone and citral caused significant mortality of 30, 90, 84 and 64% respectively, compared to negative control. The bioinsecticide, Azamax?, caused lower mortality than the compounds of the essential oils.