The BBCH-scale (weed) identifies the phenological development stages of weed species. It is a plant species specific version of the BBCH-scale.
D = Dicotyledons G = Gramineae M = Monocotyledons P = Perennial plants V = Development from vegetative parts or propagated organs No code letter is used if the description applies to all groups of plants.
Phenological growth stages and BBCH-identification keys of weedsCodePlant typeDescriptionPrincipal growth stage 0: Germination, sprouting, bud development00 Dry seed V Perennating or reproductive organs during the resting period (tuber, rhizome, bulb, stolon) P Winter dormancy or resting period01 Beginning of seed imbibition P, V Beginning of bud swelling03 Seed imbibition complete P, V End of bud swelling05 Radicle (root) emerged from seed V Perennating or reproductive organs forming roots06 Elongation of radicle, formation of root hairs and/or lateral roots07 G Coleoptile emerged from caryopsis D, M Hypocotyl with cotyledons or shoot breaking through seed coat P, V Beginning of sprouting or bud breaking08 D Hypocotyl with cotyledons or shoot growing towards soil surface V Shoot growing towards soil surface09 G Emergence: Coleoptile breaks through soil surface D, M Emergence: Cotyledons break through soil surface (except hypogeal germination); V Emergence: Shoot/Leaf breaks through soil surface P Buds show green tipsPrincipal growth stage 1: Leaf development (main shoot)10 G, M First true leaf emerged from coleoptile D Cotyledons completely unfolded P First leaves separated11 First true leaf, leaf pair or whorl unfolded P First leaves unfolded12 2 true leaves, leaf pairs or whorls unfolded13 3 true leaves, leaf pairs or whorls unfolded1 . Stages continuous till ...19 9 or more true leaves, leaf pairs or whorls unfoldedPrincipal growth stage 2: Formation of side shoots / tillering21 First side shoot visible G First tiller visible22 2 side shoots visible G 2 tillers visible23 3 side shoots visible G 3 tillers visible2 . Stages continuous till ...29 9 or more side shoots visible G 9 or more tillers visiblePrincipal growth stage 3: Stem elongation /shoot development (main shoot)30 Beginning of stem elongation G Beginning of shooting31 1 visibly extended internode G 1 node stage32 2 visibly extended internode; G 2 node stage33 3 visibly extended internode G 3 node stage3 . Stages continuous till ...39 9 or more visibly extended internodes G 9 or more nodesPrincipal growth stage 4: vegetative propagation / booting (main shoot)40 V Vegetative reproductive organs begin to develop (rhizomes, stolons, tubers, runners, bulbs)41 G Flag leaf sheath extending42 V First young plant visible43 G Flag leaf sheath just visibly swollen (mid-boot)45 G Flag leaf sheath swollen (late-boot)47 G Flag leaf sheath opening49 V Constant new development of young plants; vegetative reproductive organs reach final size G First awns visiblePrincipal growth stage 5: Inflorescence emergence (main shoot) / heading51 Inflorescence or flower buds visible G Beginning of heading55 First individual flowers visible (still closed) G Half of inflorescence emerged (middle of heading)59 First flower petals visible (in petalled forms) G Inflorescence fully emerged (end of heading)Principal growth stage 6: Flowering (main shoot)60 First flowers open (sporadically)61 Beginning of flowering: 10% of flowers open63 30% of flowers open65 Full flowering: 50% of flowers open, first petals may be fallen67 Flowering finishing: majority of petals fallen or dry69 End of flowering: fruit set visiblePrincipal growth stage 7: Development of fruit71 Fruits begin to develop G Caryopsis watery ripe79 Nearly all fruits have reached final size normal for the species and locationPrincipal growth stage 8: Ripening or maturity of fruit and seed81 Beginning of ripening or fruit coloration89 Fully ripePrincipal growth stage 9: Senescence, beginning of dormancy97 End of leaf fall, plants or above ground parts dead or dormant; P, V Plant resting or dormant
References
External links Weed Scale