This document discusses diseases that affect the cultivation of button mushrooms. It begins by outlining the importance of mushrooms and the main species cultivated commercially in India. The main diseases are then described, including fungal diseases like dry bubble, wet bubble and cobweb disease, as well as bacterial and viral diseases. Symptoms, causes and management strategies are provided for each disease. Overall, the document provides a comprehensive overview of the threats posed by diseases to mushroom cultivation and highlights the need for strict hygiene and preventative practices to control disease outbreaks.