`Co-op 32' (Pristine™) Apple

tration, slightly less acidity, and retains firmness longer in refrigerated storage (Table 1).The low internal ethylene concentration at 3 and 4 weeks of 'Co-op 32' may be responsible for its longer storage life.The tree has moderate vigor, is roundtopped, spreading with commercially desirable branch angles, 70° to 90° from vertical, with some blindwood at the base of branches.It has a semi-spur-type fruit bearing habit.Branches tend to be limber and have a tendency to droop under a heavy crop load; therefore, heading-back pruning cuts may be required during training.It is moderately productive but will require fruit thinning to achieve optimum fruit size and to reduce the tendency for biennial bearing.The bloom period is midto late season, close to 'Golden Delicious'.'Co-op 32' was tested as a seedling using greenhouse inoculation for resistance to apple scab and was evaluated in the field in the absence of a spray program for resistance to other major apple disease.Scab resistance is based on the absence of sporulation after repeated greenhouse inoculations with V. inaequalis races 1-5 using Williams' (1978) methods.Scab has never been observed on 'Co-op 32' in the orchard.Based on a rating scale of 0 (no infection) to 5 (severe infection), 'Co-op 32' was rated 0-1 for fire blight, with only a few strikes observed in 1 year on young trees, and 0-1 for powdery mildew.Cedarapple rust has not been observed on leaves or fruit of 'Co-op 32' at Lafayette, Ind., and Columbia, Mo., but has been noticed on the leaves at Cream Ridge, N.J.Because 'Co-op 32' is so early, it has not shown any summer diseases, such as sooty blotch incited by Gloeodes pomigena (Schw.)Colby or flyspeck incited by Lepthothyrium pomi (Mont.& Fr.) Sacc.'Co-op 32' can be grown without fungicides at Lafayette.The following detailed description follows Zielinksi (1955) and used color designations according to the Royal Horticultural Society Colour Chart of l938 and l941. FLOWERS Corolla:Average of 49 mm in diameter at anthesis.