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- Author or Editor: Felicitas Svejda x
Abstract
Until now, only one hybrid R. rugosa and R. chinesis has been described but it seems to have subsequently disappeared. This cross was carried out by Bruant of Poitiers before 1891 and one of the resulting seedlings was described by Andre as R. calocarpa (5).
Abstract
Present garden roses lack winter hardiness and are more or less susceptible to Blackspot. Winterhardy and disease resistant cultivars and species of Rosa are available but these have generally a short flowering season and they do not have the flower quality of present garden cultivars. Breeding programs were devised with diploid and tetraploid cultivars and species to obtain winterhardy, remontant roses with resistance to blackspot, Diplocarpon rosae Wolf., and to powdery mildew, Sphaerotheca pannosa Wall. ex. Fr./Lev. For the program at the diploid level, cultivars of R. rugosa Thunb. were used as source for hardiness and disease resistance and cultivars of R. chinensis Jacq. as source for the everblooming habit and flower quality. For the program at the tetraploid level, unnamed seedlings of different hybrid origin were used as source for hardiness and disease resistance and garden rose cultivars as source for the everblooming habit and flower quality. The desired results have been partially obtained from both breeding programs but the program with tetraploid roses produced the first tangible results.
Abstract
L83 combines high levels of winter hardiness with recurrent flowering and resistance to blackspot (Diplocarpon rosae Wolf) and mildew [Sphaerotheca pannosa (Wallr. ex Fr.) Lév.]. It is crossable with an array of different rose hybrids as a pistillate and staminate parent and produces a high percentage of winter-hardy, recurrently flowering, and disease-resistant offspring.
Abstract
‘John Davis’ and ‘J.P. Connell’ are winter-hardy, freely and recurrently flowering roses with fragrant flowers. Both roses are highly resistant to powdery mildew [Sphaerotheca pannosa (Wallr. ex Fr.) Lev.] but only ‘John Davis’ is resistant to blackspot, (Diplocarpon rosae Wolf.). ‘John Davis’ is a pillar rose with trailing growth habit and has pink flowers. ‘J.P. Connell’ is an upright shrub with yellow flowers. It is the first yellow-flowered rose to emerge from the breeding program at this laboratory.
Abstract
‘Snowgoose’ is a freely flowering, winter-hardy mock orange (Philadelphus × virginalis Rehd.) with very fragrant, double, pure white flowers. It was selected by D.R. Sampson, of the Plant Research Centre, from the cross ‘Frosty Morn’ × ‘Bouquet Blanc’ made by D.F. Cameron in 1959 (4). In the Ottawa trials ‘Snowgoose’ was one of the hardiest cultivars, comparable to ‘Galahad’ and ‘Silberregen’ but more productive.
Abstract
‘Tango’ and ‘Polka’ are very hardy, freely flowering, dwarf shrubs. ‘Tango’ has purple foliage and red flowers, with a single flowering period. ‘Polka’ has green foliage, light pink flowers, and flowers recurrently.
Abstract
This study was undertaken to find the most suitable treatment to promote germination in seeds from hardy shrub roses used in a breeding program.
Abstract
‘Charles Albanel’ and ‘Champlain’ roses are new releases which are valuable because of winterhardiness not found in present garden roses. ‘Charles Albanel’ is a R. rugosa Thunb. hybrid. It combines hardiness with a long flowering season and is highly resistant to both blackspot and mildew. The vigorous, low shrub makes it suitable as a ground cover. ‘Champlain’ is a complex hybrid of R. kordesii Wulff, R. laxa Retz., and R. spinosissima L. It combines hardiness with prolific flower production throughout the growing season, and is a medium high shrub with attractive red flowers.
Abstract
‘William Baffin’ rose combines the valuable features of winter hardiness, free and repeated flowering, and resistance to mildew [Sphaerotheca pannosa (Wallr. ex Fr.) Lév.] and blackspot [Diplocarpon rosae Wolf.]. It is one of the few winter-hardy climbers which survives the winters of Ottawa where it shows tip killing only and, therefore, can be left on the trellis over winter.
Abstract
‘Henry Kelsey’ rose combines winter hardiness with free and recurrent flowering, high levels of resistance to mildew [Sphaerotheca pannosa (Wallr. ex Fr.) Lév.], and a field resistance to blackspot (Diplocarpon rosae Wolf). ‘Henry Kelsey’ is the 3rd winter-hardy climber derived from this breeding program. It is an addition to ‘John Cabot’ (4) and ‘William Baffin’ (5) to which it compares well in winter survival, flower production, and mildew resistance. It is comparable to ‘John Cabot’ in blackspot resistance and length of flowering period, but ‘William Baffin’ is more resistant to blackspot and flowers one week longer. The bright red flowers of ‘Henry Kelsey’ are more attractive than the magenta flowers of ‘John Cabot’ and ‘William Baffin’. Another distinctive feature of ‘Henry Kelsey’ is the trailing growth habit. ‘John Cabot’ and ‘William Baffin’ have arching branches.