“…Competition from accompanying grasses, unfavorable climatic conditions, insects, nematodes and diseases such as anthracnose, powdery mildew, crown rot, and root rot are the major causes of low persistence (Skipp and Christensen, 1990). In addition, landscape position, defoliation, and fertilizer management also affect persistence (Harmoney et al, 2001;Fribourg et at., 1984). Harris et al (1980) reported a dominance of red clover in mixed swards in the second year after establishment.…”