Abstract
The fall armyworm (FAW), Spodoptera frugiperda, is a polyphagous pest because of the damage it causes to crops. The utilization of plant extracts with bioactive compounds for controlling S. frugiperda has been emerging to be a new venture. Therefore, this study aimed at analyse the impact of Adathoda vassica, Dathura metel, and Tagetes erecta extracts against FAW. Leaves were washed, air dried (27 ± 2○C) and powdered and their extracts were obtained with ethyl acetate as a solvent. Bio efficacy of extracts was studied through different concentrations (0.2, 0.4, 0.6 μg/μL) against third instar larvae of S. frugiperda to assess the contact toxicity, antifeedant activity and repellency effect. The presence of phytochemicals i.e; tannins, terpenoids, phenols, saponins, flavonoids and alkaloids were determined and characterized using FTIR analysis. The T. erecta was more effective against FAW larvae that caused significantly very high (P < 0.05) antifeedant activity, and contact toxicity with the lowest LD50 (at all concentrations). The degree of repellency was greatly influenced by the concentration of the extract. Low Index of Repellency (IR), high Percent Repellency (PR) and residual PR were observed in T.erecta and D.metel and the highest significant value (P < 0.05) was observed in T.erecta. Therefore, T.erecta can be categorized into the highest repellency class (Class V). The phytochemical and FTIR analysis confirmed the presence of bioactive compounds having the potential against S. frugiperda. Therefore, D.metel and T. erecta are showing the potentiality for pesticidal development.
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