Breeding and Selection


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.

Breeding and Selection 1

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.

Breeding and Selection

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.

Throughout this endeavor, Dr. Vorsa’s decisions were consistently guided by an unyielding desire to bring science to the art of breeding and conviction to act in accordance with what would be beneficial long term for the cranberry industry.

No other cranberry breeding program in history has made such a patient and extraordinary effort to influence the success of its progeny.


25 years of breedings effort, and 20,000 seedlings later, Dr. Vorsa introduced the first three varieties: Crimson Queen, Mullica Queen, and Demoranville.