More than 20 fungal diseases commonly occur on tomato plants in the United States. Nine of the fungal diseases are more common and prevalent on tomatoes, which include gray mold (Botrytis cinerea), Septoria leaf spots (Septoria lycopersici), early blight (Alternaria solani), anthracnose (Colletotrichum coccodes), Fusarium wilt (Fusarium oxysporum f. sp. lycopersici), Verticillium wilt (Verticillium alboatrum and Verticillium dahliae), late blight (Phytophthora infestans), leaf mold (Fulvia fulva), and buckeye rot (Phytophthora spp.). Leaf mold occurs mainly in indoor (greenhouse and high-tunnel) production. The other eight diseases are most common in open-field production.