Sclerotium Blight (fungus - Sclerotium rolfsii): A yellowish-white mat of fungal growth is formed at the base of the plant. Round, hard, yellowish to brown bodies (sclerotia) are found scattered in the fungal growth. To prevent the occurrence of this disease, it is important to carry out a thorough sanitation program. Old leaves or grass around the base of tree will encourage fungal development.