Southern Blight (fungus - Sclerotium rolfsii): Infected trees die rapidly (2 to 3 weeks) after the first visible symptoms are observed. The leaves remain attached to the tree. Creamy white to yellow rhizomorphs are formed on the outside of the roots. As the growth develops, small, dark brown sclerotia are formed among the rhizomorphs. In Texas it has been observed attacking apple trees both in the nursery and in commercial orchards.

Currently, no chemicals are cleared for the control of Southern Blight on apples. Deep burial of organic material prior to planting and controlling weeds at the base of the tree will help reduce losses. Sclerotium rolfsii is a facultative saprophyte which grows on organic material in the soil, but under certain conditions, it can attack and parasitize healthy growing plants. Crop residue should be pulled away from the base of the apple trees.

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