Comparative effects of different insecticides on spodoptera frugiperda under laboratory conditions in Upper Egypt | ||
| SVU-International Journal of Agricultural Sciences | ||
| Volume 7, Issue 2, June 2025, Pages 139-149 PDF (390.42 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/svuijas.2025.371034.1452 | ||
| Authors | ||
| R. O. H Allam* 1; M. M. S. Bakry2; E. F. M. Tolba3; H. G. I. Ali4 | ||
| 1Plant Protection Department, Faculty of Agriculture, South Valley University, Qena 83523, Egypt | ||
| 2Scale Insects and Mealybugs Research Department, Plant Protection Research Institute, A.R.C, Dokki, Giza, Egypt. | ||
| 3Plant Protection Department, Faculty of Agriculture, New valley University, New valley, Egypt. | ||
| 4Plant Protection Department, Faculty of Agriculture, Sohage university, Sohage, Egypt | ||
| 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 2nd, 3rd and 4th 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 2nd instar larvae , while for 3rd instar larvae, they were 0.04, 0.10, 0.21, 0.23, 0.28 and 0.29 ppm. For 4th 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. | ||
| Keywords | ||
| insecticides; fall armyworm; Spodoptera frugiperda; toxicity; maize | ||
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