Submitted to: Soybean Disease Compendium
Publication Type: Book / Chapter
Publication Acceptance Date: 8/10/1999
Publication Date: N/A
Technical Abstract: Anthracnose occurs wherever soybean is grown and causes damage in warm, humid areas. The disease reduces stands, seed quality, and yields by 16 to 26% or more in the United States, 30 to 50% in Thailand, and 100% in certain areas of Brazil and India. Losses increase as the percentage of infected pods rises. Foliar symptoms that develop after prolonged periods of high humidity include necrosis of laminar veins, leaf rolling, petiole cankering, and premature defoliation. Symptoms typically appear in the early reproductive stages on stems, petioles, and pods as irregularly-shaped brown areas and may resemble pod and stem blight. The most common pathogen associated with anthracnose is Colletotrichum truncatum (teleomorph unknown). C. truncatum can overseason as mycelium in infected crop residue or in infected seeds. Stem and pod infections predominately occur in the reproductive stages during warm, moist weather.