In biology, the BBCH-scale for cucurbits describes the phenological development of cucurbits, such as cucumber, melon, pumpkin, marrow, squash, calabash and watermelon, using the BBCH-scale.
The phenological growth stages and BBCH-identification keys of cucurbits are:
| Growth stage | Code | Description | |
|---|---|---|---|
| 2 digits | 3 digits | ||
| 0: Germination | 00 | 000 | Dry seed |
| 01 | 001 | Beginning of seed imbibition | |
| 03 | 003 | Seed imbibition complete | |
| 05 | 005 | Radicle emerged from seed | |
| 07 | 007 | Hypocotyl with cotyledons breaking through seed coat | |
| 09 | 009 | Emergence: cotyledons break through soil surface | |
| 1: Leaf development | 10 | 100 | Cotyledons completely unfolded |
| 11 | 101 | First true leaf on main stem fully unfolded | |
| 12 | 102 | 2nd true leaf on main stem unfolded | |
| 13 | 103 | 3rd true leaf on main stem unfolded | |
| 1 . | 10 . | Stages continuous till ... | |
| 19 | 109 | 9 or more leaves on main stem unfolded (2digit) 9th leaf unfolded on main stem (3digit) | |
| – | 110 | 10th leaf on main stem unfolded | |
| – | 11 . | Stages continuous till ... | |
| – | 119 | 19th leaf on main stem unfolded | |
| 2: Formation of side shoots | 21 | 201 | First primary side shoot visible |
| 22 | 202 | 2nd primary side shoot visible | |
| 2 . | 20 . | Stages continuous till ... | |
| 29 | 209 | 9 or more primary side shoots visible | |
| – | 221 | First secondary side shoot visible | |
| – | 22 . | Stages continuous till ... | |
| – | 229 | 9th secondary side shoot visible | |
| – | 231 | First tertiary side shoot visible | |
| 5: Inflorescence emergence | 51 | 501 | First flower initial with elongated ovary visible on main stem |
| 52 | 502 | 2nd flower initial with elongated ovary visible on main stem | |
| 53 | 503 | 3rd flower initial with elongated ovary visible on main stem | |
| 5 . | 50 . | Stages continuous till ... | |
| 59 | 509 | 9 or more flower initials with elongated ovary already visible on main stem | |
| – | 510 | 10 or more flower initials with elongated ovary already visible on main stem | |
| – | 51 . | Stages continuous till ... | |
| – | 519 | 19 ore more flower initials with elongated ovary already visible on main stem | |
| – | 521 | First flower initial visible on a secondary side shoot | |
| – | 531 | First flower initial visible on a tertiary side shoot | |
| 6: Flowering | 61 | 601 | First flower open on main stem |
| 62 | 602 | 2nd flower open on main stem | |
| 63 | 603 | 3rd flower open on main stem | |
| 6 . | 60 . | Stages continuous till ... | |
| 69 | 609 | 9th flower open on main stem or 9 flowers on main stem already open | |
| – | 610 | 10th flower open on main stem or 10 flowers on main stem already open | |
| – | 61 . | Stages continuous till ... | |
| – | 619 | 19th flower open on man stem ore more than 19 flowers on main stem already open | |
| – | 621 | First flower on secondary side shoot open | |
| – | 631 | First flower on tertiary side shoot open | |
| 7: Development of fruit | 71 | 701 | First fruit on main stem has reached typical size and form |
| 72 | 702 | 2nd fruit on main stem has reached typical size and form | |
| 73 | 703 | 3rd fruit on main stem has reached typical size and form | |
| 7 . | 70 . | Stages continuous till ... | |
| 79 | 709 | 9 or more fruits on main stem has reached typical size and form | |
| – | 721 | First fruit on a secondary side shoot has reached typical size and form | |
| – | 731 | First fruit on a tertiary side shoot has reached typical size and form | |
| 8: Ripening of fruit and seed | 81 | 801 | 10% of fruits show typical fully ripe colour |
| 82 | 802 | 20% of fruits show typical fully ripe colour | |
| 83 | 803 | 30% of fruits show typical fully ripe colour | |
| 84 | 804 | 40% of fruits show typical fully ripe colour | |
| 85 | 805 | 50% of fruits show typical fully ripe colour | |
| 86 | 806 | 60% of fruits show typical fully ripe colour | |
| 87 | 807 | 70% of fruits show typical fully ripe colour | |
| 88 | 808 | 80% of fruits show typical fully ripe colour | |
| 89 | 809 | Fully ripe: fruits have typical fully ripe colour | |
| 9: Senescence | 97 | 907 | Plants dead |
| 99 | 909 | Harvested product (seeds) | |
References
- Feller, C.; H. Bleiholder; L. Buhr; H. Hack; M. Hess; R. Klose; U. Meier; R. Stauss; T. van den Boom; E. Weber (1995). "Phänologische Entwicklungsstadien von Gemüsepflanzen: II. Fruchtgemüse und Hülsenfrüchte. Nachrichtenbl. Deut". Pflanzenschutzd. 47: 217–232.
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