DIFFERENTIAL SUSCEPTIBILITY OF LABORATORY AND FIELD STRAINS OF Spodoptera littoralis BOISD (LEPIDOPTERA: NOCTUIDAE) TO INSECT GROWTH REGULATORS | ||
| Journal of Agricultural and Environmental Sciences | ||
| Articles in Press, Accepted Manuscript, Available Online from 11 September 2025 PDF (658 K) | ||
| Document Type: Full research articles | ||
| DOI: 10.21608/jaesj.2025.406072.1281 | ||
| Authors | ||
| Ola S. Ali1; Hoda M. Nasr2; Entsar Rabea* 2; Mona A. Abd Elrasoul2; Mohamed Singab1 | ||
| 1Department of Resistance, Central Agricultural Pesticides Laboratory, Agricultural Research Center, 12618 Giza, Egypt | ||
| 2Department of Plant Protection, Faculty of Agriculture, Damanhour University, Egypt | ||
| Abstract | ||
| The cotton leafworm, Spodoptera littoralis (Boisd.), has a significant impact on crop yields worldwide. To combat these losses, various management strategies have been developed. This study aimed to assess the efficacy of several commercial insect growth regulators (IGRs); lufenuron, diflubenzuron, hexaflumuron, flufenoxuron, and triflumuron against 4th instar larvae of both laboratory and field strains of S. littoralis. The effects of these IGRs on key enzymes, including acetylcholinesterase (AChE), carboxylesterases (α- and β-esterases), and chitinase, in the same larval instars and strains were also examined. The results revealed that lufenuron was most toxic to the laboratory strain (LC50: 1.47 mg/L), while diflubenzuron proved most potent against the field strain (LC50: 3.78 mg/L). Furthermore, diflubenzuron was the most effective overall, evidenced by a reduction in the AChE activity and an increase in α-esterase activity. Lufenuron significantly boosted β-esterase activity, and both flufenoxuron and hexaflumuron led to a notable increase in chitinase activity. | ||
| Keywords | ||
| IGRs; Toxicity; AChE; Detoxification Enzymes; Spodoptera littoralis | ||
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