Lethal, Biological, and Biochemical Impacts of Two Insecticides on the 2nd Instar Larvae of The Fall Armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae)
Fangary, H., Aly, M., Ibrahim, H., Al-Amgad, Z., Salem, S. (2025). Lethal, Biological, and Biochemical Impacts of Two Insecticides on the 2nd Instar Larvae of The Fall Armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae). EKB Journal Management System, 18(2), 69-85. doi: 10.21608/eajbsa.2025.428257
Heba M. Fangary; Mohammed Z. Y. Aly; Hasnaa M. Ibrahim; Zeinab Al-Amgad; Sherehan A. R. Salem. "Lethal, Biological, and Biochemical Impacts of Two Insecticides on the 2nd Instar Larvae of The Fall Armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae)". EKB Journal Management System, 18, 2, 2025, 69-85. doi: 10.21608/eajbsa.2025.428257
Fangary, H., Aly, M., Ibrahim, H., Al-Amgad, Z., Salem, S. (2025). 'Lethal, Biological, and Biochemical Impacts of Two Insecticides on the 2nd Instar Larvae of The Fall Armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae)', EKB Journal Management System, 18(2), pp. 69-85. doi: 10.21608/eajbsa.2025.428257
Fangary, H., Aly, M., Ibrahim, H., Al-Amgad, Z., Salem, S. Lethal, Biological, and Biochemical Impacts of Two Insecticides on the 2nd Instar Larvae of The Fall Armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae). EKB Journal Management System, 2025; 18(2): 69-85. doi: 10.21608/eajbsa.2025.428257

Lethal, Biological, and Biochemical Impacts of Two Insecticides on the 2nd Instar Larvae of The Fall Armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae)

Egyptian Academic Journal of Biological Sciences. A, Entomology
Volume 18, Issue 2, June 2025, Page 69-85  XML PDF (734 K)
Document Type: Original Article
DOI: 10.21608/eajbsa.2025.428257
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Authors
Heba M. Fangary1; Mohammed Z. Y. Aly1; Hasnaa M. Ibrahim1; Zeinab Al-Amgad2; Sherehan A. R. Salem1
1Zoology Department, Faculty of Science, South Valley University, Qena, Egypt.
2General Authority for Veterinary Services, Qena Veterinary Directorate, Qena, Egypt.
Abstract
The fall armyworm Spodoptera frugiperda, a destructive insect pest, poses a significant threat to agricultural crop production, particularly maize. Traditional chemical insecticides have drawbacks, such as resistance building and environmental pollution. Proper selection and understanding of the potential consequences of insecticides are crucial for efficient control. The current study assesses the efficiency of spinetoram as a bioinsecticide compared with chlorpyrifos as an organophosphorus insecticide on the 2nd larval instar of S. frugiperda under laboratory conditions. The LC50 values of chlorpyrifos and spinetoram were 181.0 and 0.23 ppm, respectively, depending on commercial products. The results revealed that the toxicity of chlorpyrifos and spinetoram significantly increased the larval period and decreased the pupation percentage, leading to elevated larval mortality. Both tested insecticides increased pupal durations and decreased pupal weights. Moreover, both spinetoram and chlorpyrifos significantly decreased the mean number of eggs laid. Fundamentally, the two applied insecticides significantly altered carbohydrates and lipids levels; however, spinetoram significantly lowered the total protein level. Furthermore, there is a significant difference in the activity of the digestive enzymes invertase and amylase. The activity of phenoloxidase, glutathione S-transferases, and chitinase were significantly varied. Based on the results, these insecticides offer a broad range of effectiveness in the control of S.  frugiperda, but spinetoram superior chlorpyrifos in some biological and biochemical changes. Spinetoram is a safer, sustainable approach, and more environmentally friendly biocide that can be used instead of chlorpyrifos in integrated pest management strategies for controlling the fall armyworm.
Keywords
Toxicity; Chlorpyrifos; Spinetoram; S. frugiperda; Biological; Biochemical
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