PRI Disease Resistant Apple Breeding Program

 
Co-op 1
Prima
Co-op 3
Priscilla
Sir Prize
Co-op 6
Co-op 7
Co-op 8
Co-op 9
Co-op 10
Co-op 11
Co-op 12
Redfree
Co-op 14
Co-op 15
Co-op 16
Co-op 17
Co-op 18
Co-op 19
Co-op 20
Dayton
Jonafree
Williams' Pride
Co-op 24
Scarlett O'Hara
Co-op 26
Co-op 27
Co-op 28
Sundance
Enterprise
WineCrisp
Pristine
Pixie Crunch
Co-op 34
Co-op 35
Co-op 36
Co-op 37
GoldRush
CrimsonCrisp
Co-op 40
Co-op 41
Co-op 42
Juliet
Co-op 44
 
Priam
McShay
 

Redfree

Co-op 13

(PRI 2175-7 = 'Raritan' x PRI 1018-101) Introduced as 'Redfree' (Williams et al. 1981) U.S. Plant Patent No. 4,322

Brief Description

  • Fruit: 64 to 76 mm (2-1/2 to 3 in.); slightly oblate to round, regular; light green to pale yellow ground color; washed and faintly striped, very bright finish; 70 to 95% medium red, medium grained, light yellow to cream colored, firm, crisp and breaking yet slightly tender flesh; mildly acid to sweet, slightly rich and pleasant flavor; juicy; very mild, good dessert quality. Moderate fruit size. Annual cropping. Retains quality for 1 month or more in refrigerated storage. Fruit hangs on the tree until well over-ripe.
  • Tree: Vigorous, spreading growth habit, 90 degree crotch angles, moderately spurry. Slightly leggy branches with a limited basal portion of the branches bare-wooded. Moderately large sized tree. In 1978, 'Redfree' showed minimal damage in a test winter at St. Jean-sur-Richelieu, Quebec, Canada, when the majority of the apple collection showed significant winter damage. Other reports from North Dakota, Minnesota. and Canada indicate that 'Redfree' is resistant to winter cold injury.
  • Season of Maturity: Seven weeks before 'Delicious'.
  • Disease Resistance: Field immune to apple scab; field immune to cedar-apple rust; moderate level of resistance to powdery mildew; good level of resistance to fire blight.
  • Problems: Powdery mildew may warrant control only under severe disease pressure; some feel that the flavor is too mild and bland; uneven ripening, requiring two or more pickings; slight tendency toward biennial bearing habit after heavy fruit set; some tendency to set heavy crops, resulting in reduced fruit size if not properly thinned; somewhat leggy growth habit with manageable amount of undesirable bare wood.
  • General Recommendation: Suggested for commercial use, as well as small scale and home grower plantings. Produces relatively high duality, low-acid fruit, with pronounced color and adequate storage-life for early entry into the summer apple market. Resistant to winter cold injury and expected to be well adapted in the North Central U.S., Southern Canada, and similar climates.
Redfree

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