Rhynchosporium secalis Davis is the causal organism of scald disease in barley and many other grasses. In 1978, Strobe1 etaI_'isolated rhynchosporoside, a phytotoxic compound, from cultures of R. secalis, and in 1980, it was proposed2 that the structure was la- cellobiosyloxy- or l-cu-cellotriosyloxy-2-propanol. In order to clarify the relationship between the stereochemistry at the Zhydroxyl group of 1, 2-propanediol and the biological activity ...
