The diversity of fungi colonizing necrotic inflorescence buds of rhododendron (Rhododendron L.)

Małgorzata Żołna, Barbara Kierpiec-Baran, Maria Kowalik

Abstract


The infection of rhododendron (Rhododendron L.) inflorescence buds caused by pathogenic fungi induces its browning, withering, and dieback. The identification of fungi causing the infection of rhododendron inflorescence buds can be a reason for creating new improved cultivars with genetically determined resistance to pathogens. The investigations were carried out in 2010–2011 on the collection of ornamental plants of the Faculty of Horticulture, University of Agriculture in Kraków. The material comprised infected inflorescence buds collected from nine newly bred taxa and one botanical species of rhododendron. 596 colonies of fungi belonging to 31 species were isolated from infected rhododendron inflorescence buds. The dominant species were: Pestalotiopsis sydowiana, Truncatella truncata, Alternaria alternata, Phialophora asteris, and Trichoderma viride, which constituted almost 74% of the isolated fungi population. Boeremia exigua var. exigua, Epicoccum nigrum, Fusarium poae, Mammaria echinobotryoides, Paraphoma chrysanthemicola, Phialophora cyclaminis, Phoma eupyrena, Talaromyces wortmannii, Umbelopsis isabellina, and other fungi were isolated in a lower number.

The results of mycological analysis confirm the diversity of species colonizing necrotic inflorescence buds of rhododendron.

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Keywords


Rhododendron; inflorescence buds; dieback; pathogenic fungi

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References


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DOI: https://doi.org/10.5586/aa.2013.025

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