Role of the Imidacloprid and nano-Imidacloprid on Callosobruchus chinensis and Callosobruchus maculatus (Coleoptera: Tenebrionidae) under store and laboratory conditions

Abstract: The efficacy of Imidacloprid and nano-Imidacloprid were evaluated on Callosobruchus chinensis and Callosobruchus maculatus (Coleoptera: Tenebrionidae) under store and laboratory conditions. Results obtained showed that when the target insect pests treated with Imidacloprid the percentages of larval mortality obtained 77% and 91% for C. chinensis and C. maculatus, respectively. The cumulative mortality percentage was gradually increased by increasing the period of exposure to foam treated with different Nano Imidacloprid. Data showed that nano-Imidacloprid had the highest repellant activity against the C. maculatus and C. chinensis reaching to 66% and 69%. The reduction of the eggs laid per female was scored 99.3% and 99.6 eggs/female after treatments with nano-Imidacloprid. Under store conditions the percentage of infestations was significantly decreased to 6% and 7% after treating the Nano Imidacloprid as compared to 98% in the sacs control (untreated).