Evaluation location: Puerto Rico, United States
A breeder's selection group was identified in the field in St. Croix in 1993. From this collection, five hundred and eighty-five accessions were crossed to ATx623, A2Tx632, and A3SC103 in the short-day, winter months at the Isabela Research Farm, USDA Agricultural (ARS), Tropical Agricultural Research Station (TARS) in Puerto Rico in 1994 and 1995. Accessions that successfully set seed were planted in a replicated (3x), randomized complete block design trial in the winter of 1996. Five panicles per accession were bagged and then seed set counted and recorded for each trial.