This study evaluates the toxicity of selected insecticides on adult Spodoptera frugiperda and their effects on oviposition and egg hatchability. The findings contribute to improved pest management strategies targeting adult FAW. A laboratory bioassay was conducted at the University of Agricultural Sciences, Dharwad, during 2022–2023. Adult FAW were exposed to insecticide-treated surfaces for 30 seconds, and mortality was recorded at 24, 48, and 72 hours. Oviposition and egg hatchability were assessed in females paired with treated males. No significant adult mortality was observed within 72 hours post-treatment. However, insecticides significantly reduced oviposition and hatchability. Chlorantraniliprole 9.3% + lambda-cyhalothrin 4.6% ZC caused the highest reduction in egg production (165.60 eggs/female) and hatchability (53.65%). Novaluron 5.25% + emamectin benzoate 0.9% w/w was the second most effective, reducing egg production (176.87 eggs/female) and hatchability (61.90%). The study demonstrates that insecticide-treated male S. frugiperda can influence female reproductive success by reducing oviposition and egg hatchability. This suggests that targeting adult moths with specific insecticides can be an effective strategy for suppressing FAW populations. Incorporating such approaches into integrated pest management programs could enhance control measures and minimize crop damage.