BBCH-scale (currants)
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 stage | Code | Description |
|---|---|---|
| 0: Sprouting/Bud development | 00 | Dormancy: leaf buds and the thicker inflorescence buds closed and covered by dark brown scales |
| 01[1] | Beginning of bud swelling: bud scales elongated | |
| 03 | End of bud swelling: edges of bud scales light coloured | |
| 07 | Beginning of bud burst: first green or red leaf tips just visible | |
| 09 | Leaf tips extended beyond scales | |
| 1: Leaf development | 10 | Leaf tips above the bud scales: first leaves separating |
| 11 | First leaves unfolded (others still unfolding) | |
| 15 | More leaves unfolded, not yet full size | |
| 19 | First leaves fully expanded | |
| 3: Shoot development1 | 31 | Beginning of shoot growth: axes of developing shoots visible |
| 32 | Shoots about 20% of final length | |
| 33 | Shoots about 30% of final length | |
| 3 . | Stages continuous till ... | |
| 39 | Shoots about 90% of final length | |
| 5: Inflorescence emergence | 51 | Inflorescence buds and leaf buds swelling: buds closed, light brown scales visible |
| 53 | Bud burst: scales separated light green but sections visible | |
| 54 | Green or red leaf tips above bud scales | |
| 55 | First flower buds (compact raceme) visible beside unfolded leaves | |
| 56 | Beginning of raceme elongation | |
| 57 | First flower bud separated on elongating raceme | |
| 59 | Grape stage: all flower buds separated | |
| 6: Flowering | 60 | First flowers open |
| 61 | Beginning of flowering: about 10% of flowers open | |
| 65 | Full flowering: at least 50% of flowers open, first petals falling | |
| 67 | Flowers fading: majority of petals fallen | |
| 69 | End of flowering: all petals fallen | |
| 7: Development of fruit | 71 | Beginning of fruit growth: first fruits visible at raceme base |
| 72 | 20% of fruits formed | |
| 73 | 30% of fruits formed | |
| 74 | 40% of fruits formed | |
| 75 | 50% of fruits formed | |
| 76 | 60% of fruits formed | |
| 77 | 70% of fruits formed | |
| 78 | 80% of fruits formed | |
| 79 | 90% of fruits formed | |
| 8: Maturity of fruit and seed | 81 | Beginning of ripening: change to cultivar-specific fruit color |
| 85 | Advanced ripening: first berries at base of racemes have cultivar-specific color | |
| 87 | Fruit ripe for picking: most berries ripe | |
| 89 | Berries at base of racemes tending to drop (beginning of fruit abscission) | |
| 9: Senescence, beginning of dormancy | 91 | Shoot growth completed; terminal bud developed; foliage still fully green |
| 92 | Leaves begin to discolour | |
| 93 | Beginning of leaf fall | |
| 95 | 50% of leaves discoloured or fallen | |
| 97 | All leaves fallen | |
| 99 | Harvested product |
Notes
[edit]- ^ From terminal bud.
References
[edit]- Meier, U.; H. Graf; M. Hess; W. Kennel; R. Klose; D. Mappes; D. Seipp; R. Stauss; J. Streif; T. van den Boom (1994). "Phänologische Entwick-lungsstadien des Kernobstes (Malus domestica Borkh. und Pyrus communis L.), des Steinobstes (Prunus-Arten), der Johannisbeere (Ribes-Arten) und der Erdbeere (Fragaria x ananassa Duch.)". Nachrichtenbl. Deut. Pflanzenschutzd. 46: 141–153.