Persistence and Efficacy of Two Nanosilica Formulations on Callosobruchus maculatus in Different Pulses

Abstract

The persistence effects of Silica Nanoparticles (SNPs), namely, Nanosav and Aerosil®, were evaluated on several pulses for controlling Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae). For this purpose, one kg of each pulse was treated with four concentrations (50, 100, 200, and 300 mg kg-1) of each SNPs. The sampling was tested after 0, 2, 4, and 6 months’ storage period following the treatment. Adults were introduced to these samples and the number of dead adults was counted 1, 2, and 4 days after the exposure to the treated pulses. The percentage decrease in F1 progeny was calculated 42 days later. The mortality was 100% in black gram, cowpea, green gram, and chickpea when treated at a concentration of 300 mg.kg-1 of both SNP formulations in 0-month post-treatment four days after the exposure. No progeny was observed in lentil treated with 300 mg kg-1 of Nanosav in 0-month post-treatment. Another experiment was conducted to calculate SNPs adherence to the seeds. The highest adherence was on the black gram with 86 and 99.5%, in Nanosav and Aerosil®, respectively. Our results indicated that two SNPs had insecticidal activity against C. maculatus and can be used effectively in integrated pest management program of C. maculatus in stored pulses.