In biology, the BBCH-scale for currants describes the phenological development of currants, such as blackcurrants and redcurrants, using the BBCH-scale.
The phenological growth stages and BBCH-identification keys of currants are:
Growth stageCodeDescription0: Sprouting/Bud development00 Dormancy: leaf buds and the thicker inflorescence buds closed and covered by dark brown scales01From terminal bud.Beginning of bud swelling: bud scales elongated03 End of bud swelling: edges of bud scales light coloured07 Beginning of bud burst: first green or red leaf tips just visible09 Leaf tips extended beyond scales1: Leaf development10 Leaf tips above the bud scales: first leaves separating11 First leaves unfolded (others still unfolding)15 More leaves unfolded, not yet full size19 First leaves fully expanded3: Shoot development131 Beginning of shoot growth: axes of developing shoots visible32 Shoots about 20% of final length33 Shoots about 30% of final length3 . Stages continuous till ...39 Shoots about 90% of final length5: Inflorescence emergence51 Inflorescence buds and leaf buds swelling: buds closed, light brown scales visible53 Bud burst: scales separated light green but sections visible54 Green or red leaf tips above bud scales55 First flower buds (compact raceme) visible beside unfolded leaves56 Beginning of raceme elongation57 First flower bud separated on elongating raceme59 Grape stage: all flower buds separated6: Flowering60 First flowers open61 Beginning of flowering: about 10% of flowers open65 Full flowering: at least 50% of flowers open, first petals falling67 Flowers fading: majority of petals fallen69 End of flowering: all petals fallen7: Development of fruit71 Beginning of fruit growth: first fruits visible at raceme base72 20% of fruits formed73 30% of fruits formed74 40% of fruits formed75 50% of fruits formed76 60% of fruits formed77 70% of fruits formed78 80% of fruits formed79 90% of fruits formed8: Maturity of fruit and seed81 Beginning of ripening: change to cultivar-specific fruit color85 Advanced ripening: first berries at base of racemes have cultivar-specific color87 Fruit ripe for picking: most berries ripe89 Berries at base of racemes tending to drop (beginning of fruit abscission)9: Senescence, beginning of dormancy91 Shoot growth completed; terminal bud developed; foliage still fully green92 Leaves begin to discolour93 Beginning of leaf fall95 50% of leaves discoloured or fallen97 All leaves fallen99 Harvested product
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