Carson, M L Variation in Aggressiveness Among Isolates of Cercospora from Maize as a Potential Cause of Genotype-Environment Interaction in Gray Leaf Spot Trials. [electronic resource] - Plant disease Oct 2002 - 1089-1093 p. digital Publication Type: Journal Article ISSN: 0191-2917 Standard No.: 10.1094/PDIS.2002.86.10.1089 doi