Utilizing environmentally friendly nanomaterials to address insect pests and promote plant growth is urgently needed. The present study was conducted to find an alternative to chemical insecticide by comparing the entomotoxic efficacy of non-biogenic and biogenic zinc oxide nanoparticles against Sitophilus oryzae L. (Curculionidae; Coleoptera) in maize (Zea mays L.). Entomotoxic studies against S. oryzae exhibited the LD50 values of 22.33, 46.01, and 4.73 mg/ 100 g of maize seeds for non-biogenic, biogenic ZnO NPs, and malathion 5D, respectively. SEM studies of non-biogenic and biogenic zinc oxide nanoparticles on maize seeds aggregated on the attachment of S. oryzae, act as physical poison, adhering to the surface of the insect and causing desiccation, dehydration and ultimately death. Higher seed germination percentage (99 %) and dry matter production (4.8 g) were seen in non-biogenic synthesized zinc oxide nanoparticles treated seeds. Studies conclude that zinc oxide nanoparticles prepared through a non-biogenic (sol-gel) exhibit a dual role by acting as an insecticide against S. oryzae and a growth promoter in maize seeds.

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