Submitted to: Soybean Disease Compendium
Publication Type: Book / Chapter
Publication Acceptance Date: 8/10/1999
Publication Date: N/A
Technical Abstract: Sudden death syndrome (SDS) is a mid- to late-season disease with distinctive foliar symptoms that more commonly occur in high yield environments. First observed in Arkansas in 1971 it is now known to occur in most soybean-producing states. Yield losses from SDS range from slight to nearly 100% in badly affected areas and is dependent on disease onset and severity. Infected plants often have increased flower and pod abortion and reduced seed size. Symptoms first appear on leaves as scattered, interveinal chlorotic spots which may become necrotic or enlarge and coalesce into chlorotic streaks that become necrotic leaving only the midvein and major lateral veins green. Severely affected leaflets detach from the petioles which remain attached to the stem. SDS is caused by the soilborne fungus, Fusarium solani f. sp. glycines. SDS is favored by high-yield environments and is especially prevalent during cool, wet growing seasons. Plant resistant or moderately resistant cultivars.