Susceptibility of Life Stages of Groundnut Beetle (Caryedon serratus), Rice Moth (Corcyra cephalonica), and Red Flour Beetle (Tribolium castaneum) Infesting Peanuts (Arachis hypogea) and Sesame Seeds (Sesamum indicum) to Microwave Irradiation and Impact on Quality

Caryedon serratus, Corcyra cephalonica, and Tribolium castaneum are major storage pests of peanuts and sesame seeds. Postharvest losses of approximately 20% of these oilseeds are recorded worldwide, with insect pests as a major cause. Chemical fumigation is widespread and harmful, leading to adverse health and environmental effects. Microwave disinfestation of life stages (eggs, larvae, pupae, and adults) of selected insects was carried out in peanuts (Arachis hypogea) and sesame seeds (Sesamum indicum). All life stages of all insect pests were 100% eradicated within 60-90 s because of thermal shock at significantly low power (360-600 W). Physicochemical and microbial analysis demonstrated acceptable quality of both commodities post-treatment. Shelf life studies revealed that treated products can be stored for 9-12 months, while control samples spoiled in <3 months with off-flavor. Microwave shock treatment is a novel technology for complete disinfestation of oilseeds and safe extension of shelf life.