Research Article

Efficacy of Metarhizium anisopliae in Eliminating the Callosobruchus maculatus (F) (Coleoptera: Bruchidae) Pest Parasite

Abstract

Callosobruchus maculatus, more commonly known as the cowpea weevil, is a devastating pest that wreaks havoc on tropical and subtropical farmers’ livelihoods and food security by causing post-harvest losses in stored cowpeas. Pest control has traditionally relied on chemical pesticides; however, concerns about potential health and environmental risks have sparked interest in more sustainable options. Because of its pathogenicity, environmental safety, and possible inclusion into pest management approaches, the soil-borne entomopathogenic fungus Metarhizium anisopliae shows promise. Examining the pathogenicity and efficacy of M. is the goal of this study. The use of anisopliae as a biocontrol agent against C. velvety smooth. One of the aims is to compare the mortality rates, lethal concentrations, and lethal times under various environmental conditions and spore concentrations. Approaches. A highly pathogenic strain of M. was used for the laboratory tests. the family Anisopliae. Under controlled conditions of temperature and humidity, The experimental design comprised studies of pathogenicity, dose-response relationships, and environmental impacts. Using probit analysis, we were able to ascertain mortality rates and LC50/LT50 values. Researchers compared the treatment and control groups statistically. Final results. According to the results, M. Anisopliae had a higher mortality rate when tested against C. At a concentration of 1 × 10^8 conidia/ml, Maculatus showed a 95% death rate and an LT50 of 3.1 days under optimum conditions (25°C-30°C and 65%-80% relative humidity). Fungi were far less efficient in less-than-ideal environments. When compared to conventional insecticides, it was found that despite M. Despite its delayed onset of action, Anisopliae produced comparable rates of final mortality free of lingering toxicity. The findings confirm the potential of M. anisopliae as a sustainable option for chemical pesticides in the treatment of C. velvety smooth. Subsequent studies need to focus on refining formulations, doing field evaluations, and combining with other pest management strategies to improve efficacy and adoption.