Comparative effects of different insecticides on spodoptera frugiperda under laboratory conditions in Upper Egypt

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 spodoptera frugiperda under laboratory conditions in Upper Egypt

Document Type : Original Article

Authors

¹ 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 Department, Faculty of Agriculture, New valley University, New valley, Egypt.

⁴ Plant Protection Department, Faculty of Agriculture, Sohage university, Sohage, Egypt

10.21608/svuijas.2025.371034.1452

Abstract

The fall armyworm, Spodoptera frugiperda, is a highly destructive phytophagous pest 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 larvae of S. frugiperda under laboratory conditions using the Leaf-dip method. The results showed that the fourth instar larvae of S. frugiperda were 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. Mineral oil treatment showed a lower effect on residual mortality at 52.67%. The insecticides tested could be ranked in descending order as follows: emamectin benzoate, chlorfenapyr, indoxacarb, methomyl, azadirachtin and KZ oil. The corresponding LC₅₀ values after 24 hours were 0.02, 0.07, 0.11, 0.14, 0.23 and 0.25 ppm for 2^nd instar larvae , while for 3^rd instar larvae, they were 0.04, 0.10, 0.21, 0.23, 0.28 and 0.29 ppm. For 4^th instar larvae, the results could be arranged in descending order as follows: emamectin benzoate, chlorfenapyr, indoxacarb, methomyl, KZ oil and azadirachtin with corresponding LC₅₀ values after 24 hours of 0.05, 0.12, 0.25, 0.34, 0.35 and 0.35 ppm. According to the results, emamectin benzoate is a good component of an integrated pest management program.

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