Soybean Leaf Sunburn
Sunburn damage first appears as small, interveinal, brick-red spots on upper and lower leaf surfaces. Discoloration may spread over and along the veins, with spots later developing brownish centers. Sunburn damage may be confused in the southern U.S. with foliar symptoms of purple seed stain fungus (Cercospora Leaf Spot) and certain viruses.  (adapted from Interactive Soybean Diagnostic Guide; http://www.psu.missouri.edu/soydoc/files/environ/sunburn.htm)

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Leaf #1, back side	Leaf #1 closeup of backside	Leaf #1, Front side
Leaf #2 Back side	Leaf #2 Front Side	Leaf #3 Back side
Leaf #3 Front side	Leaf #4 Back side	Leaf #4 Front Side

Todd Vagts
Iowa State University Extension
Field Crops Specialist
1240 D. Heires Avenue 
Carroll, IA 51401 
Office: 712-792-2364; Cell: 712-249-6025;  Fax: 712-792-2366
Email: vagts@iastate.edu  

For questions or comments please respond to vagts@iastate.edu

This page last updated on 07/29/04