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Horticulturae
Volume 11
Issue 10
10.3390/horticulturae11101256
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Determination of the Resistance of Tolerant Hybrids of Buxus to the Pathogen Cylindrocladium buxicola and the Effect of Nutrition and Climatic Conditions on Leaf Color

by
Ivana Šafránková
1,
Jiří Souček
2,
Marie Machanderová
3,
Petr Salaš
4,
Jana Burgová
4,* and
Ludmila Holková
1
1
Department of Crop Science, Breeding and Plant Medicine Faculty of AgriSciences, Mendel University in Brno, Zemědělská 1665/1, 613 00 Brno, Czech Republic
2
Czech Agrifood Research Center, Drnovská 507, 161 01 Prague, Czech Republic
3
JM GREEN s.r.o. Studenec 181, 675 02 Koněšín, Czech Republic
4
Department of Breeding and Propagation of Horticultural Plants, Faculty of Horticulture, Mendel University in Brno, Valtická 337, 691 44 Lednice, Czech Republic
*
Author to whom correspondence should be addressed.
Horticulturae 2025, 11(10), 1256; https://doi.org/10.3390/horticulturae11101256
Submission received: 12 September 2025 / Revised: 11 October 2025 / Accepted: 15 October 2025 / Published: 17 October 2025
(This article belongs to the Section Plant Pathology and Disease Management (PPDM))
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Abstract

Boxwood (Buxus sp.) plays a key role in historical gardens due to its evergreen foliage and resilience. However, recent outbreaks of disease caused by fungal pathogens such as Calonectria spp. (C. pseudonaviculata, C. henricotiae) and Pseudonectria spp. (P. buxi, P. foliicola), as well as pest pressures from Cydalima perspectalis, have led to significant losses. This study examined 100 boxwood plantings across the Czech Republic to evaluate pest and disease occurrence. Further, six modern boxwood cultivars from the groups of BetterBuxus® and NewGen® were tested in field trials under the climatic conditions of the Czech Republic, focusing on their resistance to abiotic stress and foliage color retention throughout the year. Laboratory trials confirmed all cultivars were susceptible to C. pseudonaviculata, with ‘Renaissance’ showing the slowest disease progression. Field assessments under two contrasting management regimes (“Minimalistic” and “Pampered”) indicated sporadic boxwood blight incidence but frequent Volutella blight outbreaks, particularly where plants suffered frost stress. Leaf color, an important esthetic trait, was evaluated using Munsell charts and measuring the relative chlorophyll content. ‘Skylight’ most closely matched Buxus sempervirens in the shade of green and winter color.
Keywords: Calonectria pseudonaviculata; Pseudonectria buxi; susceptibility; evergreen; winter color Calonectria pseudonaviculata; Pseudonectria buxi; susceptibility; evergreen; winter color
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MDPI and ACS Style

Šafránková, I.; Souček, J.; Machanderová, M.; Salaš, P.; Burgová, J.; Holková, L. Determination of the Resistance of Tolerant Hybrids of Buxus to the Pathogen Cylindrocladium buxicola and the Effect of Nutrition and Climatic Conditions on Leaf Color. Horticulturae 2025, 11, 1256. https://doi.org/10.3390/horticulturae11101256

AMA Style

Šafránková I, Souček J, Machanderová M, Salaš P, Burgová J, Holková L. Determination of the Resistance of Tolerant Hybrids of Buxus to the Pathogen Cylindrocladium buxicola and the Effect of Nutrition and Climatic Conditions on Leaf Color. Horticulturae. 2025; 11(10):1256. https://doi.org/10.3390/horticulturae11101256

Chicago/Turabian Style

Šafránková, Ivana, Jiří Souček, Marie Machanderová, Petr Salaš, Jana Burgová, and Ludmila Holková. 2025. "Determination of the Resistance of Tolerant Hybrids of Buxus to the Pathogen Cylindrocladium buxicola and the Effect of Nutrition and Climatic Conditions on Leaf Color" Horticulturae 11, no. 10: 1256. https://doi.org/10.3390/horticulturae11101256

APA Style

Šafránková, I., Souček, J., Machanderová, M., Salaš, P., Burgová, J., & Holková, L. (2025). Determination of the Resistance of Tolerant Hybrids of Buxus to the Pathogen Cylindrocladium buxicola and the Effect of Nutrition and Climatic Conditions on Leaf Color. Horticulturae, 11(10), 1256. https://doi.org/10.3390/horticulturae11101256

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