Vol. 7, Issue 8, Part A (2025)

White muscardine is a fungal infection frequently observed in silkworms, with higher incidence during the rainy and winter seasons. Diseases in silkworms occur throughout the year in all sericulture regions, affecting Bombyx mori L. Among the major diseases-grasserie, flacherie, muscardine, and microsporidiosis white muscardine is particularly severe. It is caused by the entomopathogenic fungus Beauveria bassiana, also referred to as mycosis. The disease mainly targets the larval and pupal stages, resulting in considerable losses to cocoon production. Favorable conditions for its development include low temperatures (below 25 °C) and high relative humidity (90-95%). Infected larvae generally die within four to five days, and within 24 hours their bodies become mummified and covered with white fungal spores. Occasionally, infected larvae manage to spin cocoons but die inside cocoon, preventing moth emergence. The pathogen spreads through spores released from infected cadavers, with environmental factors such as high humidity and low temperature facilitating its transmission within rearing trays. This study highlights the symptoms, epidemiology, and environmental factors contributing to the occurrence, spread of white muscardine disease and management.