Black stem rust (Ug99) Puccinia graminis f.sp. tritici (Ug99) is a serious disease of wheat and barley. While wheat in the United States is resistant to most strains of black stem rust, it is not ...
IN a letter to NATURE, published July 23, 1927, I showed, on the basis of experimental evidence, that Puccinia helianthi is heterothallic. The results of further experiments now enable me to state ...
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