‘Rebecca’s Appalachian Angel’: A Cultivar of Flowering Dogwood (Cornus florida) with Large Leaves and Floppy White Bracts

Trigiano, Robert N.; Hamm, Trinity P.; Boggess, Sarah L.; Staton, Margaret

doi:10.21273/hortsci17234-23

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…In contrast, Fessler et al (2021) reported that the minimal average disease management cost for flowering dogwood is %$769/acre per year ($1900/ha per year) as a result of currently recommended spray schedules in Tennessee, USA. Also, this management cost has surged from $120 to $1975/ha per year because of powdery mildew (Li et al 2009;Trigiano et al 2023). Our sample estimates could be the lower bound of the cost spectrum, because they suffer from a low sample size and perhaps miss some components of the costs.…”

Section: Resultsmentioning

confidence: 99%

Assessing the Impact of Integrated Dogwood Disease Management Practices on Labor Needs and Production Costs in Tennessee Nurseries

Liyanage,

Khanal,

Witcher

et al. 2024

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Early and accurate detection of diseases, and implementation of efficient disease management practices are crucial to reducing the economic impact associated with plant disease outbreaks. Based on survey responses from dogwood nursery growers in Tennessee, USA, scouting was identified as an important disease management practice adopted by a majority of growers for disease management in field-grown, container-grown, and pot-in-pot production systems. Our results show a significant positive correlation between disease severity and scouting frequency for dogwood plants grown in container and pot-in-pot production systems. Our efficiency measure is a self-rated efficacy scale perceived by the nursery growers about their existing disease management system in nursery plants. A significant positive correlation was found between the efficacy of disease management and the number of workers involved in scouting and a negative association between the worker hours spent in scouting and the grower's experience/exposure to other disease detection methods. The majority of nursery growers followed a set spray schedule between May and October, with applications scheduled every other week. In addition, our results showed significant positive correlations between efficacy and spray-related factors, such as disease severity and worker hours spent in spraying; efficacy of disease management and spraying frequency in field-grown dogwoods; and foliar spray costs and efficacy of disease management. We estimated ≈$379/acre per year average costs for dogwood disease management, which the growers find to be one of the major components of the dogwood production budget. Moving to automated systems of disease scouting and management has the potential to reduce the cost of these labor-intensive disease management practices of dogwood production.

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Section: Resultsmentioning

confidence: 99%

Assessing the Impact of Integrated Dogwood Disease Management Practices on Labor Needs and Production Costs in Tennessee Nurseries

Liyanage,

Khanal,

Witcher

et al. 2024

horts

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“…

Cornus florida L. or flowering dogwood is native throughout most of the eastern the southeastern United States and has become a mainstay ornamental tree species grown and sold by numerous small-or large-volume woody plant nurseries. Many of the popular cultivars are clonally propagated selections identified from natural variations present in seedlings growing in the field for disease resistance (e.g., powdery mildew; Windham et al 2003) or in natural settings (e.g., 'Appalachian Spring', which is resistant to dogwood anthracnose; Windham et al 1998), "sports" for floral bract/leaf color variations discovered on existing cultivars (Cherokee Sunrise), or cultivars with unique growth and floral bract traits from trees growing in natural environments (Rebecca's Appalachian Angel;Trigiano et al 2023). Seldom are cultivars of flowering dogwood developed via breeding programs.

…”

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confidence: 99%

‘Erica’s Appalachian Sunrise’: An Apomitically Derived Cultivar from Cornus florida ‘Comco No. 1’ Cherokee Brave™

Trigiano,

Boggess,

Molnar

et al. 2024

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Cornus florida L. or flowering dogwood is native throughout most of the eastern the southeastern United States and has become a mainstay ornamental tree species grown and sold by numerous small-or large-volume woody plant nurseries. Many of the popular cultivars are clonally propagated selections identified from natural variations present in seedlings growing in the field for disease resistance (e.g., powdery mildew; Windham et al. 2003) or in natural settings (e.g., 'Appalachian Spring', which is resistant to dogwood anthracnose; Windham et al. 1998), "sports" for floral bract/leaf color variations discovered on existing cultivars (Cherokee Sunrise), or cultivars with unique growth and floral bract traits from trees growing in natural environments (Rebecca's Appalachian Angel;Trigiano et al. 2023). Seldom are cultivars of flowering dogwood developed via breeding programs. However, 'Erica's Appalachian Sunrise' [EAS: US Plant Patent (PP) 32,468] was obtained from a breeding attempt between 'Karen's Appalachian Blush' [KAB (PP 13,165 P2;Windham et al. 2003)], which is resistant to powdery mildew, and 'Comco No. 1' Cherokee Brave™ [CB (PP 10,166)], which displays showy pink-red floral bracts in the spring.

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Multifunctionality of angiosperm floral bracts: a review

Song,

Chen,

Lev‐Yadun

et al. 2024

Biological Reviews

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Floral bracts (bracteoles, cataphylls) are leaf‐like organs that subtend flowers or inflorescences but are of non‐floral origin; they occur in a wide diversity of species, representing multiple independent origins, and exhibit great variation in form and function. Although much attention has been paid to bracts over the past 150 years, our understanding of their adaptive significance remains remarkably incomplete. This is because most studies of bract function and evolution focus on only one or a few selective factors. It is widely recognised that bracts experience selection mediated by pollinators, particularly for enhancing pollinator attraction through strong visual, olfactory, or echo‐acoustic contrast with the background and through signalling the presence of pollinator rewards, either honestly (providing rewards for pollinators), or deceptively (attraction without reward or even trapping pollinators). However, studies in recent decades have demonstrated that bract evolution is also affected by agents other than pollinators. Bracts can protect flowers, fruits, or seeds from herbivores by displaying warning signals, camouflaging conspicuous reproductive organs, or by providing physical barriers or toxic chemicals. Reviews of published studies show that bracts can also promote seed dispersal and ameliorate the effects of abiotic stressors, such as low temperature, strong ultraviolet radiation, heavy rain, drought, and/or mechanical abrasion, on reproductive organs or for the plants' pollinators. In addition, green bracts and greening of colourful bracts after pollination promote photosynthetic activity, providing substantial carbon (photosynthates) for fruit or seed development, especially late in a plant's life cycle or season, when leaves have started to senesce. A further layer of complexity derives from the fact that the agents of selection driving the evolution of bracts vary between species and even between different developmental stages within a species, and selection by one agent can be reinforced or opposed by other agents. In summary, our survey of the literature reveals that bracts are multifunctional and subject to multiple agents of selection. To understand fully the functional and evolutionary significance of bracts, it is necessary to consider multiple selection agents throughout the life of the plant, using integrative approaches to data collection and analysis.

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‘Rebecca’s Appalachian Angel’: A Cultivar of Flowering Dogwood (Cornus florida) with Large Leaves and Floppy White Bracts

Cited by 3 publications

References 8 publications

Assessing the Impact of Integrated Dogwood Disease Management Practices on Labor Needs and Production Costs in Tennessee Nurseries

Assessing the Impact of Integrated Dogwood Disease Management Practices on Labor Needs and Production Costs in Tennessee Nurseries

‘Erica’s Appalachian Sunrise’: An Apomitically Derived Cultivar from Cornus florida ‘Comco No. 1’ Cherokee Brave™

Multifunctionality of angiosperm floral bracts: a review

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