Evaluation the Efficacy of Abamectin and Spinosad Against Stored Grain Pests: Mortality, Persistence, and Residual Activity

Document Type : Original Article

Authors

Plant Protection Research Institute (PPRI), Agricultural Research Centre, 12611, Dokii, Giza, Egypt.

Abstract

This study evaluates the efficacy, persistence, and residual activity of abamectin and spinosad against three major stored grain pests: Rhyzopertha dominica, Sitophilus oryzae, and Tribolium castaneum under controlled laboratory conditions (30±1ºC, 65±5% RH). Wheat grains were treated with varying concentrations of abamectin (0.01–0.06% w/w) and spinosad (0.012–0.192% w/w), and adult mortality was assessed after 1, 3, 5, 7, and 14 days. Progeny production was evaluated 60 days post-treatment. Mortality increased with higher doses and prolonged exposure, with all species exhibiting significant mortality after seven days. R. dominica was highly susceptible to both insecticides, with mortality ranging from 58.3% to 100% abamectin and 38.3% to 100% for spinosad. Similarly, S. oryzae showed high susceptibility, with mortality rates between 53.3% and 100%. T. castaneum was less affected, with mortality ranging from 15.0% to 100% abamectin and 3.3% to 100% for spinosad. Abamectin demonstrated greater residual efficacy than spinosad over six months. These findings highlight abamectin’s potential as a superior grain protectant; it offers long-lasting control against key storage pests and contributes to more effective pest management strategies in stored wheat grain.

Keywords

Journal of Plant Protection and Pathology
Volume 16, Issue 10
November 2025
Pages 479-485

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