Encyclopedia - Soybeans

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Thielaviopsis Root Rot of Soybean

Thielaviopsis root rot, also called black root rot, is caused by a fungus that infects the root system early in the season. The fungus causes black discoloration of the taproot and rotting of the hypocotyl. Plants may have symptoms of stunting, shortened internodes and yellow spots along the leaf veins and in severe situations plants may die. Read More

Tobacco Ringspot of Soybean

Symptoms caused by Tobacco ringspot virus (TRSV) include bud blight, shepherd's crooking, stunting, wilting, delayed maturity, bud and leaf proliferation, reduced pod number, and discolored, distorted, and dead leaves. TRSV-infected plants may have discolored pith, petiole distortion and discoloration, leaf vein discoloration, and poor root nodulation. TRSV can be seed trans... Read More

Tobacco Streak of Soybean

Symptoms caused by Tobacco streak virus (TSV) include bud blight, shepherd's crooking, stunting, wilting, delayed maturity, bud and leaf proliferation, reduced pod number, and discolored, distorted, and dead leaves. TSV infection can cause discoloration and dead streaks at nodes, dark spots on pods, and delayed seed development. TSV can be seed transmitted but is also spread b... Read More

White Mold of Soybean

White mold (also called Sclerotinia stem rot) is a significant problem in the North Central soybean production region and Canada. White mold is often recognized by fluffy, white growth on soybean stems. Initial symptoms generally develop from R3 to R6 as gray to white lesions at the nodes. Lesions rapidly progress above and belo... Read More

Wildfire of Soybeans

Wildfire of soybeans is an uncommon bacterial disease that is mainly found in the southern United States. Symptoms include lesions that are light to dark brown which normally have yellow halos. Read More