Rio

1. Rio was bred from the following germplasm sources: BAA-15=8.3%, BAA17=8.3%, BAA-20=8.3%, UC123=12.5%, UC143=12.5%, CimarronVR=50%. The breeding procedure was recurrent selection for resistance to Phytophthora root rot, anthracnose, spotted alfalfa aphid, pea aphid and blue alfalfa aphid in the above sources, followed by strain crosses. The germplasm is estimated to have come from African (45%), Chilean (23%), Flemish (15%), M.varia (10%), Turkistan (5%), M.falcata (1%), and Ladak (1%).

2. Areas of probable adaptation and use are the Sacramento and San Joaquin valleys and the Souther