Comparative Effects of Different Insecticides on the Spodoptera frugiperda under Laboratory Conditions

Allam, R.O.H; Bakry, M.M.S.; Tolba, E.F.M.; Ali, H.G.I.

doi:10.21608/svuijas.2025.371034.1452

Comparative Effects of Different Insecticides on the Spodoptera frugiperda under Laboratory Conditions

Articles in Press

Document Type : Original Article

Authors

¹ Head of Plant Protection Department, Faculty of Agriculture, South Valley University, Qena 83523, Egypt

² Scale Insects and Mealybugs Research Department, Plant Protection Research Institute, A.R.C, Dokki, Giza, Egypt.

³ Plant Protection Dept., Faculty of Agric, New valley University, New valley, Egypt.

⁴ Plant Protection dep. faculty of Agriculture, Sohage university

10.21608/svuijas.2025.371034.1452

Abstract

The fall armyworm, Spodoptera frugiperda, is a highly destructive phytophagous of agricultural crops in various countries around the world. The study focused on evaluating the toxicity of six insecticides namely, emamectin benzoate, chlorfenapyr, indoxacarb, methomyl, azadirachtin and KZ oil against the 2^nd , 3^rd and 4^th larvals of S. frugiperda under laboratory conditions using the Leaf-dip method. The results exhibited that the fourth instar larvae of S. frugiperda was less susceptible to the examined insecticides than the larvae in their second and third instars. Moreover, the treatment of Emamectin benzoate showed a higher residual mortality effect against second, third and fourth instars of S. frugiperda larvae with an average of 68.67% compared to other tested compounds. While mineral oil treatment showed a lower effect on the residual mortality by 52.67%. The insecticides that were tested could be sorted as follows in descending order: emamectin benzoate, chlorfenapyr, indoxacarb, methomyl, azadirachtin and KZ oil. The corresponding LC₅₀ values after 24 h. were 0.02, 0.07, 0.11, 0.14, 0.23 and 0.25 ppm for 2^nd instar larvae , while in case of 3^rd instar larvae were 0.04, 0.10, 0.21, 0.23, 0.28 and 0.29 ppm. On the other hand, the result could be descendingly arranged as follows: emamectin benzoate, chlorfenapyr, indoxacarb, methomyl, KZ oil and azadirachtin and corresponding LC₅₀ values after 24 h. were 0.05, 0.12, 0.25, 0.34, 0.35 and 0.35 ppm for 4^th instar larvae. According to the results, emamectin benzoate is a good component of an integrated pest management program.

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