This is a fungal brood dissease of honey bees, is caused by spore forming fungus. Worker, drone, and queen larvae are susceptible to getting infected. Spores of the fungus are ingested with the larval food. The spores germinate in the hind gut of the larva, but myceelial (vegetatibe) growth is arrested until the larva is sealed in its cell. When t larvae are about 6 or 7 days old and sealed in their cells, the mycelia break through the somach wall and invade the larval tissues until the entire larva is over come. It generally takes about 2 to 3 days for th larvae to become overcome.