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 stageCodeDescription2 digits3 digits0: Germination00 000 Dry seed01 001 Beginning of seed imbibition03 003 Seed imbibition complete05 005 Radicle emerged from seed07 007 Hypocotyl with cotyledons breaking through seed coat09 009 Emergence: cotyledons break through soil surface1: Leaf development10 100 Cotyledons completely unfolded11 101 First true leaf on main stem fully unfolded12 102 2nd true leaf on main stem unfolded13 103 3rd true leaf on main stem unfolded1 . 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 unfolded2: Formation of side shoots21 201 First primary side shoot visible22 202 2nd primary side shoot visible2 . 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 visible5: Inflorescence emergence51 501 First flower initial with elongated ovary visible on main stem52 502 2nd flower initial with elongated ovary visible on main stem53 503 3rd flower initial with elongated ovary visible on main stem5 . 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 shoot6: Flowering61 601 First flower open on main stem62 602 2nd flower open on main stem63 603 3rd flower open on main stem6 . 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 open7: Development of fruit71 701 First fruit on main stem has reached typical size and form72 702 2nd fruit on main stem has reached typical size and form73 703 3rd fruit on main stem has reached typical size and form7 . 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 form8: Ripening of fruit and seed81 801 10% of fruits show typical fully ripe colour82 802 20% of fruits show typical fully ripe colour83 803 30% of fruits show typical fully ripe colour84 804 40% of fruits show typical fully ripe colour85 805 50% of fruits show typical fully ripe colour86 806 60% of fruits show typical fully ripe colour87 807 70% of fruits show typical fully ripe colour88 808 80% of fruits show typical fully ripe colour89 809 Fully ripe: fruits have typical fully ripe colour9: Senescence97 907 Plants dead99 909 Harvested product (seeds)
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