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Frederickson, D E and Mantle, P G and Milliano, W A J De (1993) Windborne spread of ergot disease (Claviceps africana) in sorghum A-lines in Zimbabwe. Plant Pathology, 42 (3). pp. 368-377.
Frederickson, D E and Mantle, P G and Milliano, W A J De (1994) Susceptibility to ergot in Zimbabwe of sorghums tbat remained uninfected in their native climates in Ethiopia and Rwanda. Plant Pathology, 43 (1). pp. 27-32.