|Botanical Name:||Prunus ×gondouinii|
Peter Stoppel, Kressbronn, Germany
|Agent in Canada:||
Moffat & Co.
P.O. Box 2088, Station D
1200-427 Laurier Ave. West
PLANT: medium to strong vigour, upright to spreading growth habit, medium to dense branching, produces flowers
ONE-YEAR-OLD SHOOT: medium thickness, medium length of internode at middle third of shoot, no pubescence on upper third, many lenticels, strong intensity of anthocyanin colouration of apex, medium degree of branching at end of summer
VEGETATIVE BUD OF ONE-YEAR-OLD SHOOT: positioned slightly outwards in relation to shoot, medium to large, acute apex, size of bud support is medium to large
YOUNG SHOOT (DURING RAPID GROWTH): strong to very strong intensity of anthocyanin colouration of young leaf
PETIOLE: very long, sparse pubescence of upper side, medium to deep groove
LEAF: ratio of leaf blade length in relation to petiole length is small
LEAF BLADE: long to very long, broad, length to width ratio is medium, elliptic shape, apex is right angled (excluding tip), long to very long tip, obtuse base, only serrate incisions of margin, medium to deep incisions of margin
LEAF BLADE (UPPER SIDE): light green, medium degree of glossiness
LEAF BLADE (LOWER SIDE): very sparse pubescence
NECTARY: predominantly more than two per leaf, equally distributed at base of leaf blade and petiole, red, reniform shape
Origin & Breeding History: 'STO1', which is typically used as a cherry rootstock, originated from a cross between Prunus avium L. and Prunus cerasus L. (botanically known as Prunus ×gondouinii ), in Germany, in 1989. The cross was conducted as part of a breeding program to create cherry rootstocks with improved adaptability. 'STO1' was selected in the summer of 1999 for its improved adaptability to heat and dry conditions when compared to other rootstocks, its weak vegetative growth, higher yield and positive influence on the fertility of the grafted variety.
Tests & Trials: The detailed description of 'STO1' is based on the UPOV report of Technical Examination, application number 2012/0021, purchased from the Community Plant Variety Office, in Angers, France. The trial was conducted by the Bundessortenamt, in Prüfstelle Wurzen, Germany, from 2015 to 2016.
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