Genus Pythium is a group of plant pathogens that cause devastating diseases in a wide range of crops. Some synonyms for Genus Pythium are water molds, Pythiaceae, Pythiales, and Oomycetes. These terms describe the fungal-like organisms characterized by their mode of reproduction and their habitat in water and soil. Another synonym for Genus Pythium is damping-off fungus, which refers to the seedling disease caused by the pathogen. These synonyms highlight the importance of understanding the biology and ecology of Genus Pythium to manage the disease and promote plant health.