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Verwoerd, L. (1929). The biology, parasitism and control of Urocystis tritici Koern., the causal organism of flag smut in wheat (Triticum spp.) and recording the occurrence of Urocystis occulta (Wallr.) Rab. in South Africa as the cause of stem smut of rye. Union of South Africa Department of Agriculture Science Bulletin 76: 52 pp., 8 pls.