Toxicity and Antifeedant Effects of Apricot Kernel Extract and Its Main Components against Cotton Leaf Worm, Spodoptera littoralis (Lepidoptera: Noctuidae) Larvae With Reference To Some Physiological Effects

Abstract

Toxicity and antifeedant effect of hexane apricot kernel extract (HEAK) and its gas chromatography-mass spectroscopy (GC-MS) identified fatty acid (FA) components palmitic acid (PA), Oleic acid (OL) and FA derivatives (Linoleic acid methyl ester (LAME)) were assessed against 2 nd and 4 th instar larvae of Spodoptera littoralis under laboratory conditions. Methoxyfenozide (Runner 24% SC ® ) was used as reference insecticide to (HEAK) and its components. The results were statistically analyzed by probit analysis to calculate (LC 50 ) of mortality and the concentrations caused 50% of antifeedant index (AI 50 ) after 24, 48 and 72 hrs of exposure. The results of toxic and antifeedant effects showed the definite prevalence of HEAK versus its FA components against the two instar larvae of S. littoralis throughout 72 hrs of exposure. However the toxic initiation of the extract and its components paced methoxyfenozide by the first 24 hrs of exposure, methoxyfenozide still owned a superior toxicity and antifeedant response on the treated larvae. This work has been associated with some physiological tests including haemocytes count and corpora allata (CA) activity.

Nutritional Indices and Efficacy of Acokanthera spectabilis (Hochst.) Extract and Chlorfluazuron against Spodoptera littoralis (Boisd.) Escorted by Mitigating Amendment to the Light Impact

“…Syringic, and ferulic acids in extracts of different cotton varieties resulted in complete mortality during the first week of treatment in Helicoverpa armigera (Hübner) (Perveen et al, 2001;Punia et al, 2023). Moreover, the presence of GC-MS free carboxylic fatty acids and their derivatives that have been detected in A. spectabilis extract, such as oleic, octadecanoic, ç-linolenic, palmitic, 9,12octadecadienoic acid and, hexadecanoic methyl ester possessed double bonds in their chains that may be proportionally correlated with their insecticidal activity against the larvae of S. littoralis (Khamis et al, 2016;Eldesouky et al, 2019;Abdullah, 2019;Sung et al, 2023). In addition, diterpene compounds, and neophytadiene may be confirmed by the study of Saber et al, (2018) for their promising insecticidal activity and synergistic effects against S. littoralis larvae.…”

“…Neophytadiene, quercetin, and double bond-free carboxylic or methylated fatty acids could realize larvacidal effect against S. littoralis (Boisd.) (Mesbah et al, 2007;Khamis et al, 2016;Saber et al, 2018;Eldesouky et al, 2019;Abdullah, 2019;Sung et al, 2023). On the other hand, several field experiments of chlorfluazuron showed a conspicuous growth inhibition in the early instars larvae and reduction population of many lepidoptrous pests, (Wang et al, 2021;Zhou et al, 2023;Eldessouky and Korish, 2023).…”