The Latent Impacts of Oxadiazine Insecticide, Indoxacarb, on Varying Biological Characteristics of the Fall Armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)

Ali,, A. M.

doi:10.21608/jppp.2025.421274.1382

The Latent Impacts of Oxadiazine Insecticide, Indoxacarb, on Varying Biological Characteristics of the Fall Armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)

Document Type : Original Article

Author

A. M. Ali,

Plant Protection Department, Faculty of Agriculture, Minia University, Minia, Egypt.

10.21608/jppp.2025.421274.1382

Abstract

The oxadiazine insecticide, indoxacarb, known for its potent efficacy against numerous Lepidopterous species, is widely marketed under various trade names in the pesticide industry. This study evaluated the acute toxicity and sublethal effects of indoxacarb on different life stages of Spodoptera frugiperda. The larval stage proved most susceptible to indoxacarb via ingestion; the 96-hour LC₅₀ value for larvae was 0.064 ppm, significantly lower than the 24-hour LC₅₀ of 0.57 ppm, demonstrating increased toxicity with prolonged exposure. Adults exhibited higher tolerance, with LC₅₀ values ranging from 6.87 to 14.61 ppm, while the egg stage was the most tolerant, showing an LC₅₀ of 322.21 ppm. Sublethal exposure (96-hour LC₂₅) significantly impacted larval development and adult reproduction. Cumulative larval mortality reached 54%, and only 47% of treated larvae successfully pupated, compared to 88% in the control. Larval and pupal durations were significantly prolonged to 14.22 and 17.19 days, respectively, versus 11.25 and 14.69 days in the control. Daily food consumption and larval weight gain were also significantly reduced. Furthermore, adult females emerging from treated larvae laid significantly fewer eggs, and egg hatchability dropped to 61.65% compared to 96.14% in the control. These findings underscore indoxacarb's potent larvicidal activity and its significant sublethal effects on development and reproduction. Therefore, indoxacarb is a valuable tool for S. frugiperda management, particularly when applied to early larval instars, and should be integrated into comprehensive IPM strategies to maximize its effectiveness against this key pest.

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