DNA fingerprinting technology enabled individual varieties to be readily distinguished, yet many years of work lie ahead to determine which individuals possessed valuable traits…
Over many years, Dr Vorsa isolated the most productive strain of the existing commercial varieties. Therefore, Dr. Vorsa isolated superior parents to produce superior progeny.
Once the germplasm was sorted out, many hundreds of controlled crosses were made in the greenhouse, their progeny evaluated in thousands of 5′ x 5′ field plots.
Dr. Vorsa began to discern which varieties had the greatest propensity to develop superior progeny, and these varieties became favored parents.
Traits such as yield, fruit size, percentage rotten fruit, TAcy, fruit chemistry, and plant vigor were all evaluated over multiple years. The best plants were selected and the process was repeated; crosses, evaluation, selection.
Especially promising selections went iinto larger replicated trials, often at commercial cranberry growers and in several locations.
No other cranberry breeding program in history has made such a patient and extraordinary effort to influence the success of its progeny.