Southern stem blight occurs on a wide range of host plants, including soybeans. Soybean losses due to this disease vary considerably, with damage occurring as scattered localized areas of dead plants.
This soil borne disease is largely confined to poorly drained clay soils, but may occur on other soils. Severe plant losses and yield reductions are common in susceptible cultivars.
Charcoal rot is primarily a root and basal stem disease, but may be seen on above ground parts of infected plants. Diseased tissue in the taproot and lower stem develops a grayish discoloration.
This disease is caused by the fungus Calonectria ilicicola. Root infections may occur soon after planting, but initial symptoms are usually not evident until soybeans are in mid to late reproductive growth stages.
Sudden death syndrome (SDS) is a mid- to late-season disease which usually occurs in fertile, high yielding, well-managed fields in the U.S. SDS is caused by the soilborne fungus Fusarium virguliforme, formerly known as F. solani f. sp. glycines.
The LSU AgCenter and the LSU College of Agriculture