In this undated photo provided by South Dakota State University Extension, yellow halos can be seen around southern rust pustules on a corn leaf as it is held against the sunlight. South Dakota State University plant pathologist Emmanuel Byamukama says southern rust has been detected in corn fields in Turner, Lincoln and Brookings counties. (AP Photo/South Dakota State University Extension)
Southern rust detected in 3 South Dakota counties
SIOUX FALLS — A late-summer string of hot, humid weather has brought an unwelcome visitor to South Dakota's corn crop.
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