|Botanical Name:||Prunus cerasus L. x (Prunus avium L. x Prunus canescens Bois)|
Peter Stoppel, Kressbronn, Germany
|Agent in Canada:||
Moffat & Co.
P.O. Box 2088, Station D
1200-427 Laurier Ave. West
PLANT: strong vigour, upright to spreading growth habit, medium to strong branching, produces flowers
ONE-YEAR-OLD SHOOT: medium thickness, very short to short internode at middle third of shoot, pubescence present on upper third, few to medium number of lenticels, medium intensity of anthocyanin colouration of apex, medium degree of branching at end of summer
VEGETATIVE BUD OF ONE-YEAR-OLD SHOOT: positioned markedly outwards in relation to shoot, small to medium size, obtuse apex, size of bud support is small to medium
YOUNG SHOOT (DURING RAPID GROWTH): strong intensity of anthocyanin colouration of young leaf
PETIOLE: medium to long, medium to dense pubescence of upper side, medium depth of groove
LEAF: ratio of leaf blade length in relation to petiole length is small to medium
LEAF BLADE: medium to long, broad, length to width ratio is small to 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): dark green, medium to strong degree of glossiness
LEAF BLADE (LOWER SIDE): medium to dense pubescence
STIPULES: medium to long
NECTARY: predominantly two per leaf, predominantly distributed at base of leaf blade, yellow, reniform shape
Origin & Breeding History: 'STO3', typically used as a cherry rootstock, originated from a cross between Prunus cerasus L. and a Prunus hybrid (P. avium L. x P. canensis Bois), in Germany, in 1989. The cross was conducted as part of a breeding program to create cherry rootstocks with improved adaptability. 'STO3' 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 'STO3' is based on the UPOV report of Technical Examination, application number 2012/2007, 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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