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Bioactivity of Farnesol (a sesquiterpene compound) against the adult life parameters and reproductive potential of Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae)

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Published 2021 in International Journal of Biosciences

ABSTRACT

Egyptian cotton leafworm Spodoptera littoralis is native in Africa, but it is distributed in different parts of Europe and Asia. It is a dangerous herbivore damaging more than 90 field and ornamental crops of high economic importance. The current study was conducted to assess the impact of Farnesol on the most important parameters of adult performance and reproductive potential of this insect. The newly moulted larvae of 5th (penultimate) or 6th (last) instar larvae fed castor bean leaves previously treated with seven concentrations of Farnesol (400, 200, 100, 50, 25, 12.5 & 6.25 ppm) for 24 hr. The obtained results could be summarized as follows. Farnesol exhibited an adulticidal activity, since various adult mortalities were recorded. The adult morphogenesis was disrupted, since some adult deformities were observed. The total adult longevity and oviposition period were significantly shortened, but the pre-oviposition period was slightly prolonged. Farnesol exhibited an extended inhibitory effect on the oviposition efficiency, since oviposition rate was drastically regressed, in a dose-dependent course. Fecundity was detrimentally prohibited. Fertility was dramatically reduced. The embryonic development was remarkably retarded, since the incubation period of eggs was remarkably prolonged.

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