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Co-op 31
type: Pie
synonyms: Trademarked as Winecrisp
summary: The 19th apple in the PRI breeding programme, this apple is great for fresh eating as well as for pies and grows well in cooler climates.
identification: Medium size, round. The base colouor is greenish yellow over which is a deep red wash, sometimes striped, with the base colour showing through on the shaded face. Can be lightly russeted which tends to dull the colour. Marked with small, tan lenticels.
characteristics: The flesh is yellowish, firm, crisp. Sweet-tart with a spicy flavour.
origins: Developed in 1968 at Rutgers University in Newark, New Jersey (U.S.A.) from a cross of Rock 41-112 with pollen from PRI 841-103. Seedlings from the cross were screened for scab at Purdue University and planted in 1970 as PAR4T217 at the University of Illinois' Pomology Research Farm in Urbana, Illinois. Selected in 1976 as best of the seedling crop resulting from the cross and released in 1990. This was the nineteenth of 44 varieties released in the course of the PRI cooperative programme to develop disease resistant cultivars carried out by the state universities in Purdue, Rutgers and Illinois. The flower parent (Rock 41-112) is a complex breeding that includes Cox’s Orange Pippin , Yellow Newtown Pippin , Edgewood , Red Rome Beauty and Jonathan . The pollen parent (PRI 841-103) breeding includes Starking Delicious , Jonathan , Rome Beauty and Malus floribunda 821.
cultivation: Moderately vigorous, semi-spreading tree. Favours well-drained, loamy soils. Produces heavy crops annually and needs to be thinned at fruit set.
cold storage: Keeps up to eight months, but flavours decline progressively while it resists shrivelling.
vulnerabilities: Immune to scab. Some resistance to fire blight and powdery mildew. Prone to cedar apple rust. The fruit has a tendency to develop water core when subject to hot temperatures in late summer.
harvest: Ready for harvest by the middle of the fifth period. Fruit holds well on the tree to maturity.
notes: Bred for resistance to scab.
pollination group: D
pollination peak: 12
ploidism: Diploid. Self sterile.
cold storage weeks: 32
harvest period: 5
hardiness: 4
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