the following detailed description of the ‘ co - op 39 ’ ( crimson crisp ) variety is based on observations of asexually reproduced progeny . the observed progeny are trees which were 24 years of age and growing on ‘ malling 7 ’ rootstock in west lafayette , ind . vigor .— low . overall shape .— round . height .— about 15 - 17 feet . width .— overall spread of about 16 feet . caliper .— 8 inches at 12 inches above the ground . trunk .— stocky . trunk bark texture .— rough and scaly . trunk bark color .— greyed - green ( rhs 191a ). patches or other markings .— exfoliates , greyed - orange ( rhs n167c - d ). primary branches .— upright . angle of emergence from trunk : about 40 degrees to about 45 degrees . angle does not vary from top to bottom of tree . branch color .— one - year old branches are greyed - purple ( rhs n186a ) in color , while two - year old branches are brown ( rhs n200b ) in color . branch pubescence .— new wood : yes , yellow green ( rhs 147d ). older wood : no . branch lenticels .— medium density , approximately 14 per square centimeter ; elongated , typical examples of which measured about 1 mm in diameter ; white ( rhs n155b ) in color . internodes .— average internode length is about 2 . 5 cm on a one - year old shoot . bearing .— annual . hardiness .— zones 5b . disease resistance .— field immune to apple scab , but susceptible to cedar apple rust and fireblight . texture .— medium . sheen .— dull . length .— about 70 . 9 mm to about 89 . 5 mm , averaging about 82 . 8 mm in 10 leaves . width .— about 38 . 7 mm to about 64 . 2 mm , averaging about 51 . 6 mm in 10 leaves . thickness .— about 0 . 2 mm to about 0 . 5 mm , averaging about 0 . 3 mm in 10 leaves . petiole .— about 23 . 1 mm long ; yellow green in color ( rhs 147d ); about 1 . 7 mm in diameter . fine pubescence . base of petiole is grey - purple in color ( rhs 184d ). margin .— serrate . tip shape .— acuminate . stipules .— 2 stipules in opposite arrangement ; yellow green ( rhs 147d ) in color ; about 0 . 1 mm wide . leaf color .— upper leaf surface : yellow - green ( rhs 146a ). lower leaf surface : yellow - green ( rhs 147d ). vein : yellow - green ( rhs 147d ). pubescence .— none . the length , width , thickness and other measurements were obtained from observations of ten typical leaves in west lafayette , ind . on sep . 14 , 2004 . size .— medium size , typical flower measuring about 46 . 0 mm across . shape .— radially symmetrical . color .— unopened bud : red - purple ( rhs 67 ). opened flower : red - purple ( rhs 65c ) to white ( rhs n155d ). petals .— 5 petals per flower ; about 23 mm ( to slightly larger ) inch long . red - purple ( rhs 65c ) to white ( rhs n155d ) in color . stamen .— arranged in a single row . 20 stamens , each about 10 mm long and red - purple ( rhs 69d ) in color . anthers .— yellow ( rhs 2 ) in color . pistil .— stigma is about 10 mm long ; 5 styles , fused at base , and green - yellow ( rhs 1b ) in color . sepals .— about 8 mm and about 4 mm wide ( at base ); recurved shape ; yellow - green ( rhs 144b ) in color ; purple in color at tip ; pubescent . pollen .— yellow ( rhs 2c ) in color . fragrance .— slight . bloom season .— in 2004 in west lafayette , ind ., full bloom observed on may 1 for ‘ co - op 39 ’, april 27 for the ‘ delicious ’ variety ; april 30 for the ‘ golden delicious ’ variety . fruit : ( observations from a limited number of typical fruit in west lafayette , ind .) size .— medium ; size varies from 2 . 75 to 3 inches in diameter . form .— oblate to round ; symmetric . length to diameter ratio 0 . 92 ; no ribbing ; no lobes at calyx end . cavity .— medium acute ; about 12 . 1 mm deep and about 30 . 4 mm wide . basin .— wide ; about 6 . 8 mm deep and about 27 . 7 mm wide ; no pubescence observed . stem .— short ; about 11 . 8 mm long and 3 . 5 mm in diameter ; greyed - orange ( rhs 177b ) in color . locules .— small ; 5 locules ; closed . seeds adhere to carpel wall . skin .— medium with glossy finish . no tendency to become waxy or oily in storage . lenticels .— inconspicuous ; red - purple ( rhs 61d ); round . color .— general color effect : overcolor is red - purple ( ranging from rhs 60a — 60d ) in color with dark purple blush ( rhs 60a ) coloring . ground color : red - purple ( rhs 60c ). overcolor : blush is a dark purple ( rhs 59a ). undercolor at calyx end is green yellow ( rhs 1b ). russet : none . fruit properties at picking on sep . 10 , 2004 in west lafayette , ind .— acid content : about 0 . 633 g / 100 ml malic acid . firmness : about 7 kg , averaging about 10 kg . soluble solids : about 13 . 5 % — 16 . 5 %. starch index : on a scale of 1 ( high starch ) to 8 ( low starch ), average about 6 . 2 . flavor : rich and complex . juiciness : moderately juicy . flesh color : yellow ( rhs 4d ). aroma : slight . core .— median bundle area shape ; about 27 . 42 mm long and about 22 . 3 mm wide ; calyx tube closed with a length of about 5 . 3 mm . core lines defined weakly . seed .— about 2 seeds per cell ; acute shaped ; about 10 . 9 mm long and about 4 . 4 mm wide ; greyed - red ( rhs 178b ) in color . fruit production .— first picking date in 2004 in west lafayette , ind . was about september 15 , and last picking date was about october 10 . storage .— fruit remains fresh at room temperature for many days , and can be stored up to 4 months in cold storage ( 1 ° c .). usage .— dessert .
a new apple variety distinguished by resistance to apple scab ; crisp flesh and excellent dessert quality ; attractive color ; ripens in the middle of september in west lafayette , ind . ; size varies from 2 . 75 to 3 inches in diameter ; and good storage ability .