PRI Disease Resistant Apple Breeding Program

Co-op 1
Co-op 3
Sir Prize
Co-op 6
Co-op 7
Co-op 8
Co-op 9
Co-op 10
Co-op 11
Co-op 12
Co-op 14
Co-op 15
Co-op 16
Co-op 17
Co-op 18
Co-op 19
Co-op 20
Williams' Pride
Co-op 24
Scarlett O'Hara
Co-op 26
Co-op 27
Co-op 28
Pixie Crunch
Co-op 34
Co-op 35
Co-op 36
Co-op 37
Co-op 40
Co-op 41
Co-op 42
Co-op 44

Co-op 17

(PRI 1689-110 = Ill. #2 ('Winesap' o.p.) x PRI 668-100) (Williams et al. 1975)

Brief Description

  • Fruit: 70 to 76 mm (2-3/4 to 3 in.); short conic to slightly oblate-conic; bright, smooth, russet-free finish; burnt-orange blushed 100% self pale yellow with inconspicuous lenticels, attractive; thick tough skin; fine grained, pale yellow colored, very firm, moderately tough, crisp flesh; sweet to mildly sub-acid, slightly aromatic, bland flavor; juicy. Heavy annual cropping. Fruit hangs on the tree extremely well. Retains quality for six months or more in refrigerated storage. Fruit tend to be too small with a heavy crop unless thinned.
  • Season of Maturity: Three and one-half weeks after 'Delicious'.
  • Tree: Moderately vigorous; smaller than average tree size; moderately spurry, with some tendency for branches to weep; some tendency for tip bearing, some bare wood on branch bases.
  • Disease Resistance: Field immune to apple scab; moderately resistant to powdery mildew; susceptible to cedar-apple rust; moderately resistant to fire blight.
  • Problems: Bland, insufficient flavor, tough skin; tough flesh texture; undesirable growth habit (also see Degree of Resistance to Disease).
  • General Recommendation: Problems too severe for further consideration. Discarded at Lafayette. Goonewardene and Williams (1988) showed that Co-op 17 possesses resistance to three different insect pests.
Co-op 17

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