Years of development and testing proved apple variety #603 could stand severe midwest weather and meet other production requirements. Named "Chieftain," it will likely be available from commercial growers in 1968.
Denisen, E. L.; Cott, A. E.; and Pickett, B. S.
"Chieftain, A New Apple for Mid-America,"
Iowa Farm Science: Vol. 20
, Article 8.
Available at: https://lib.dr.iastate.edu/farmscience/vol20/iss8/8