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Gray
Leaf Spot of corn, caused by the fungus Cercospora zeae-maydis, has
been known in the United States since 1924 when it was first reported in
Illinois. Until the 1970's, the disease was a minor pathogen with the exception
of occasional outbreaks. With the increased use of reduced and no-tillage
practices, gray leaf spot has become a very significant problem primarily in the
more humid corn growing areas of the east and Midwest. Reports of severe disease infestations are mostly from low lying areas and river
bottoms where periods of leaf wetness and high relative humidity are long enough
to favor the development and spread of the disease.
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