1. PGI 8633C is a 201 clone synthetic developed through phenotypic recurrent selection for reaction to blue alfalfa aphid and Phytophthora root rot. It was selected entirely from Mecca. The 201 plants were placed in a cage at Woodland, California where breeder seed (Syn 1) was produced in 1985 and 1986. Seed from both cages was bulked.  Approximate germplasm source contributions are: African 46%, Indian 20%, Turkista