Flowering, Drought and Disease Tolerance, and Landscape Performance of Landscape Roses Grown under Low-input Conditions in North Central Texas

Landscaping today involves the struggle to balance aesthetically pleasing plants while minimizing the impact on the environment, reducing water usage, decreasing fertilizer use, and eliminating or significantly reducing pesticide usage. Roses (Rosa sp.), although seen as challenging plants, remain the most popular flowering shrub in the United States. The identification of new cultivars that combine beauty, pest and disease resistance, and drought tolerance are important to Texas landscapes. Sixty roses were assessed over a 3-year period to determine flowering, drought tolerance, disease resistance, and overall landscape performance in minimal-input gardens in north central Texas. Atypical weather during the study had a significant impact on performance. A 2-year drought (2010–11) was accompanied by the hottest summer on record (2011), which included a record number of days of at least 100 °F or higher. As a result, supplemental irrigation was provided three times both summers. Roses generally fared well under these conditions and survived the drought. Flowering was most abundant during the spring and fall, and it was least abundant in the summer. Powdery mildew [PM (Sphaerotheca pannosa var. rosae)] was a minor problem. Nine of 60 cultivars developed no visible symptoms of PM during the study. Most PM occurred in Spring 2010, with very little found after June; none was found in 2011. Black spot [BS (Diplocarpon rosae)] was serious for some cultivars, but most were BS-free; RADrazz (Knock Out®) and Lady Banks White had no observed BS during the study. BS occurred mostly in May, June, and November. Overall landscape performance ratings were high, with 23 cultivars having a mean landscape performance rating equal to or better than the Belinda’s Dream standard. The best-performing cultivars were RADrazz (Knock Out), RADcon (Pink Knock Out®), RADyod (Blushing Knock Out®), WEKcisbaco (Home Run®), and Alister Stella Gray. This study was able to identify many other highly performing roses in north central Texas.

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Performance of Garden Roses in North-central Texas under Minimal Input Conditions

HortTechnology ◽

10.21273/horttech.18.3.417 ◽

2008 ◽

Vol 18 (3) ◽

pp. 417-422 ◽

Cited By ~ 4

Author(s):

W.A. Mackay ◽

S.W. George ◽

C. McKenney ◽

J.J. Sloan ◽

R.I. Cabrera ◽

...

Keyword(s):

Black Spot ◽

Nutrient Content ◽

Plant Performance ◽

Quality Data ◽

North Central ◽

Knock Out ◽

North Central Texas ◽

Foliar Nutrient ◽

Central Texas ◽

Overall Performance

One hundred sixteen rose (Rosa spp.) cultivars were evaluated under minimal input conditions in north-central Texas for 3 years. Plant quality data included overall plant performance, number of flowers, percentage of bloom coverage, final vigor, and survival. Disease ratings for black spot (Diplocarpon rosae), petal blight (Alternaria alternata), powdery mildew (Sphaerotheca pannosa), and aphid (Myzus spp.) infestations were previously reported. Of the original 116 cultivars, 25 had 50% or higher mortality during the trial. Own-root cultivars performed significantly better than the grafted cultivars and had significantly better survival (P = 0.001). As a class, the Polyantha cultivars exhibited the best overall performance, mean bloom percentage, final vigor and survival, while cultivars in the Hybrid Tea class had the worst performance in all measures. Foliar nutrient content, bloom number, and mean percentage of bloom were not good predictors of overall performance. Of the diseases monitored, black spot was the most severe and was closely correlated to overall performance and final vigor, but was not the only factor determining overall performance. The top five cultivars in mean overall performance were RADrazz (Knock Out™), Caldwell Pink, Sea Foam, Perle d'Or, and The Fairy, in descending order.

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Landscape Performance of Buck Roses under Minimal-input Conditions in North-central Texas

HortTechnology ◽

10.21273/horttech04539-19 ◽

2020 ◽

Vol 30 (2) ◽

pp. 231-237

Author(s):

Derald Harp ◽

Gaye Hammond ◽

David C. Zlesak ◽

Greg Church ◽

Mark Chamblee ◽

...

Keyword(s):

Black Spot ◽

State University ◽

Alkaline Soils ◽

North Central ◽

Diplocarpon Rosae ◽

Landscape Performance ◽

Wide Range ◽

North Central Texas ◽

Central Texas ◽

Dead Plant

Griffith Buck (Iowa State University) bred roses (Rosa sp.) to survive long, cold winters and hot, humid summers yet still retain their foliage without fungicides. Unfortunately, there is little known about the performance of Buck roses in the southern United States. Thirty-eight Buck rose cultivars were evaluated for flowering, disease resistance, drought tolerance, and overall landscape performance in alkaline soils with no fertilizer, no pesticides, and only limited irrigation. Flowering occurred on a bimodal basis, with the highest per plant mean bloom number (16.3 blooms) and bloom coverage (9.7%) in April, and a second flowering in the fall, with 13.7 blooms per plant and 6.9% bloom coverage in October. Drought stress symptoms were most evident in October, with a wide range of symptom severity across cultivars. Black spot (Diplocarpon rosae) and powdery mildew (Podosphaera pannosa) incidence were rare across all roses and years. Landscape performance scores, rated using a 0 to 10 scale with 10 representing a perfect plant and 0 a dead plant, were highest in April (6.5) and lowest in June (4.6) and July (4.6). Landscape performance was not correlated with bloom number or coverage. While unable to recommend many of the Buck roses for north-central Texas, the cultivars April Moon and Freckles, and possibly a few other roses, can join Carefree Beauty™ (BUCbi) as recommended roses for the area.

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The Impact of Cooling Ponds in North Central Texas on Dairy Farm Performance

Journal of Dairy Science ◽

10.3168/jds.s0022-0302(05)72904-0 ◽

2005 ◽

Vol 88 (6) ◽

pp. 2281-2286 ◽

Cited By ~ 5

Author(s):

M.A. Tomaszewski ◽

M.A. de Haan ◽

J.A. Thompson ◽

E.R. Jordan

Keyword(s):

Dairy Farm ◽

North Central ◽

North Central Texas ◽

Central Texas ◽

Farm Performance ◽

The Impact

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Evaluation of Griffith Buck Roses for Resistance to Black Spot

HortTechnology ◽

10.21273/horttech.18.4.588 ◽

2008 ◽

Vol 18 (4) ◽

pp. 588-591

Author(s):

Daren S. Mueller ◽

Mark L. Gleason ◽

Nicholas P. Howell ◽

Edward M. Moran

Keyword(s):

United States ◽

Disease Resistance ◽

Field Trial ◽

Black Spot ◽

The United States ◽

The Other ◽

North Central ◽

The North ◽

Disease Resistant ◽

Central United States

Recently, roses (Rosa spp.) that require relatively little maintenance have gained in popularity in the United States. One group of these roses is the Griffith Buck roses, which were selected to survive the extremely cold winters of the north-central United States. Many of these roses were rated qualitatively as having disease resistance when they were released, but their resistance levels to black spot (Marssonina rosae) have not been quantified, compared with each other, or rated against other resistant or susceptible roses. In a field trial in Iowa in 2005 and 2006, 24 Griffith Buck roses that were originally described as disease resistant were compared with susceptible and resistant control cultivars for susceptibility to black spot. No fungicides were applied in either year. Plants were rated five times each year for black spot incidence, and also to assess overall plant appearance. Griffith Buck roses ‘Carefree Beauty’, ‘Aunt Honey’, ‘Honeysweet’, ‘Earthsong’, and ‘Pearlie Mae’ had significantly less black spot than many of the other cultivars. In addition, these cultivars also remained attractive and could be used in low-maintenance landscapes in the north-central United States, even under moderate black spot pressure.

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Landscape Performance of Ebony Crepe Myrtle Cultivars in Low-input Landscapes in North-central Texas

HortTechnology ◽

10.21273/horttech04748-20 ◽

2021 ◽

pp. 1-7

Author(s):

Derald Harp ◽

Kevin Chretien ◽

Mariah Brown ◽

Curtis Jones ◽

Jose Lopez-Serrano

Keyword(s):

Sandy Loam ◽

North Central ◽

Low Input ◽

Landscape Performance ◽

North Central Texas ◽

Central Texas ◽

Overall Performance ◽

Intensively Managed ◽

Study Sites ◽

Managed Landscapes

The Ebony series of crepe myrtle (Lagerstroemia indica) cultivars includes several (Ebony Embers, Ebony Fire, Ebony Flame, Ebony Glow, and Ebony and Ivory), marketed today under the Black Diamond® brand. These are relatively new crepe myrtle cultivars unique for their dark foliage, but with little information concerning their performance in north-central Texas, especially in low-input landscapes. The study was conducted from 2014 to 2017 at three locations in north-central Texas with three soil types, an acidic fine sandy loam, a neutral pH silt loam, and an alkaline heavy clay. Although soils and environmental conditions caused variations between sites, overall performance among cultivars was consistent across all study sites, with Centennial Spirit having better landscape performance than any of the Ebony cultivars tested. ‘Ebony and Ivory’ and ‘Ebony Blush’ had the overall lowest landscape performance. Ebony cultivars grew more slowly, had fewer blooms, and were more susceptible to powdery mildew than Centennial Spirit. While the trees may perform better in more intensively managed landscapes, the Ebony cultivars did not perform as well as Centennial Spirit in low-input landscapes in north-central Texas.

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