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 12

(PRI 2175-25 = 'Raritan' x PRI 1018-101) (Williams et al. 1975) U.S. Plant Patent No. 4,359

Brief Description

  • Fruit: 70 to 76 mm or more (2-3/4 to 3+ in.); round with wide, open calyx; cuticle covered with pronounced glaucous, waxy, bloom; green yellow to pale yellow ground color, very bright, glossy finish; moderately striped. 60 to 90% light to medium red, attractive; medium grained, light cream colored, crisp and slightly breaking flesh; mildly to moderately acid, slightly spicy, with full rich flavor, very juicy. Flavor breaks down and is unpalatable after one month in refrigerated storage. Uniformly shaped, large fruit evenly distributed throughout tree canopy.
  • Season of Maturity: Eight weeks before 'Delicious'.
  • Tree: Moderately vigorous, somewhat weeping growth habit, some tendency for tip bearing. In 1978, Co-op 12 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.
  • Disease Resistance: Field immune to apple scab; moderately resistant to powdery mildew; susceptible to cedar-apple rust; moderately resistant to fire blight.
  • Problems: Short storage life, uneven ripening, some tendency to drop when ripe, little color develops inside tree canopy, develops full color only when over-mature (see also-Tree and Degree of Resistance to Disease).
  • General Recommendation: Discarded at Lafayette. Resistant to winter cold injury and expected to be well adapted in the North Central U.S., Southern Canada, and similar climates. After initial observations, The Swedish University of Agricultural Sciences, Balsgard, has concluded that Co-op 12 is well adapted under Swedish conditions, and recommends the cultivar for home grower use.
Co-op 12

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