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Co-op 38
type: Culinary, Cider, Dessert
synonyms: Goldrush, GoldRush, Delisdor
summary: A long keeper that will last up to half a year in cold storage. A late bloomer ideal for areas of late frost.
identification: Medium size, round-conic shape. Thin base colour is greenish tending to yellow and even saffron when fully ripe with a bronzed-orange blush on the sun-exposed side when grown in warmer climates. The apple has a somewhat rough feel to it as a result of russet patches and the lenticels are russeted. The skin is thin and does not develop a waxy feel.
characteristics: Flesh is pale cream in colour, coarse-grained, but firm, breaking and crisp. Rather tart, but with a high sugar content. Rich, spicy flavour with complexities that emerge only after about a month in storage. It resists browning when exposed to air.
uses: Cooking and eating. Also used for making cider.
origins: Developed under the name Co-op 38 by the cooperative apple breeding program at the Universities of Purdue/Rutgers/Illinois (U.S.A.) in the 1980s in an effort to create a disease-free cultivar. A cross between the Golden Delicious and Co-op 17 (an experimental variety crossed with Winesap ) bred for resistance to most diseases. The cross was made in 1972 at Urbana, Illinois and the resulting seedling was planted in 1973 at the Purdue Horticulture Research Farm in West Lafayette, Indiana. Introduced in 1994 as GoldRush and patented by PRI.
cultivation: Moderately vigorous, upright spreading. Bears fruit on spurs and on limbs. It needs to be aggressively thinned about a month after petal fall to reach its prescribed size and to ensure annual crops.
cold storage: Keeps up to six months. Flavours improve with storage.
vulnerabilities: Susceptible to cedar apple rust and powdery mildew. Highly resistant to scab. Slightly susceptible to brown rot.
harvest: Requires a long growing season and is ready for harvest starting in the middle of fifth period. Fruit tends to hang even after fully ripe.
notes: There is also a Goldrush listed as a mutation of Golden Delicious.
pollination group: E
pollination peak: 18
ploidism: Diploid. Self sterile.
cold storage weeks: 24
brix: 15
harvest period: 5
hardiness: 4
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