Biochemical Composition, Toxicity and Bioactivities of the Essential Oil extracted from Coffea arabica L. husks against the Cotton Leafworm, Spodoptera littoralis (Boisduval) (Lepidoptera: Noctudiae)

Abstract

throughout Therefore, approaches for their a ) analyzed its were screened for insecticidal activity against the larval instars of the littoralis GC/MS analysis revealed that the arabic coffee included 13 compounds of which Oleic acid comprises the largest proportion 65 % which is known for its insecticidal efficacy. Other compounds that have insecticidal activities were also separated; Cyclononasiloxane, octadecamethyl-, n-Hexadecanoic acid, 9,12-Octadecadienoic acid (Z, Z)- and N-Isobutyl-11-(3,4-methylenedioxyphenyl)-2E,4E,10E-undecatrienoic amide. The oil extract was tested against the 4 th larval instars. The results indicated the efficacy of the extract as larvicide with the values of LC 50 and LC 90 equal to 1.8083 and 8.3227 respectively. The application of the oil extract against the larvae resulted in the prolongation of both larval and pupal duration and the decrease of the growth rate, pupation, adult longevity and fecundity. Also, the corrected weight of consumed leaf, consumption index (IC), relative growth rate (RGR), the efficacy of ingested and digested food conversion to body tissue (ECI) and (ECD), respectively and the approximate digestibility (AD) were decreased after the application of the oil extract on the larvae. As a result of the current study, the oil extract from the husk of Coffea arabica revealed its efficacy as both larvicide and deterrent against the 4 th instar larvae of cotton leafworm S. littoralis .