LOOSE SMUT (USTILAGO TRITICI (PERS.) ROSTR.) OF WHEAT: PHYSIOLOGIC SPECIALIZATION AND REACTION OF VARIETIES IN ENGLAND

Three physiologic races of loose smut (named Ci, C2 and C3), found in wheat varieties grown at Cambridge, differ from those identified in Holland. The resistance or susceptibility of fifty-seven wheat varieties to races Ci, C2 and C3 has been determined. Experiments have shown that infection of an ear can take place over a period of several days. There is a close relationship between the percentage of plants attacked and the severity of attack in a single plant.