In 1972, National Academy of Sciences released Genetic Vulnerability of Major Crops – a study prompted by the SCLB in 1970 – and the lack of genetic diversity in major crops briefly enjoys media attention and becomes a national issue. The report was prepared by scientists who, alerted by the 1970 epidemic of southern corn leaf blight (Helminthosporium maydis) the U.S., became concerned about the potential for similar outbreaks in other major crops.