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Registros recuperados: 3
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Calonectria spp. causing leaf spot, crown and root rot of ornamental plants in Tunisia Naturalis
Lombard, L.; Polizzi, G.; Guarnaccia, V.; Vitale, A.; Crous, P.W..
Calonectria spp. are important pathogens of ornamental plants in nurseries, especially in the Northern Hemisphere. They are commonly associated with a wide range of disease symptoms of roots, leaves and shoots. During a recent survey in Tunisia, a number of Calonectria spp. were isolated from tissues of ornamental plants showing symptoms of leaf spot, crown and root rot. The aim of this study was to identify these Calonectria spp. using morphological and DNA sequence comparisons. Two previously undescribed Calonectria spp., C. pseudomexicana sp. nov. and C. tunisiana sp. nov., were recognised. Calonectria mexicana and C. polizzii are newly reported for the African continent. Pathogenicity tests with all four Calonectria spp. showed that they are able to...
Tipo: Article / Letter to the editor Palavras-chave: Calonectria; Crown and root rot; DNA phylogeny; Leaf spot; Pathogenicity; Systematics.
Ano: 2012 URL: http://www.repository.naturalis.nl/record/531828
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High species diversity in Colletotrichum associated with citrus diseases in Europe Naturalis
Guarnaccia, V.; Groenewald, J.Z.; Polizzi, G.; Crous, P.W>.
Species of Colletotrichum are considered important plant pathogens, saprobes, and endophytes on a wide range of plant hosts. Several species are well-known on citrus, either as agents of pre- or post-harvest infections, such as anthracnose, postbloom fruit drop, tear stain and stem-end rot on fruit, or as wither-tip of twigs. In this study we explored the occurrence, diversity and pathogenicity of Colletotrichum spp. associated with Citrus and allied genera in European orchards, nurseries and gardens. Surveys were carried out during 2015 and 2016 in Greece, Italy, Malta, Portugal and Spain. A total of 174 Colletotrichum strains were isolated from symptomatic leaves, fruits, petals and twigs. A multi-locus phylogeny was established based on seven genomic...
Tipo: Article / Letter to the editor Palavras-chave: Anthracnose; Citrus; Multi-locus sequence typing; Pathogenicity.
Ano: 2017 URL: http://www.repository.naturalis.nl/record/630359
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Symptomatic Citrus trees reveal a new pathogenic lineage in Fusarium and two new Neocosmospora species Naturalis
Sandoval-Denis, M.; Guarnaccia, V.; Polizzi, G.; Crous, P.W..
The diversity of fusaria in symptomatic Citrus trees in Greece, Italy and Spain was evaluated using morphological and molecular multi-locus analyses based on fragments of the calmodulin (CAM), intergenic spacer region of the rDNA (IGS), internal transcribed spacer region of the rDNA (ITS), large subunit of the rDNA (LSU), RNA polymerase largest subunit (RPB1), RNA polymerase second largest subunit (RPB2), translation elongation factor 1-alpha (EF-1α) and beta-tubulin (TUB) genes. A total of 11 species (six Fusarium spp., and five Neocosmospora spp.) were isolated from dry root rot, crown, trunk or twig canker or twig dieback of citrus trees. The most commonly isolated species were Fusarium sarcochroum, F. oxysporum and Neocosmospora solani. Three new...
Tipo: Article / Letter to the editor Palavras-chave: Citrus canker; Citrus dieback; Morphology; Multigene phylogeny; Systematics.
Ano: 2018 URL: http://www.repository.naturalis.nl/record/630171
Registros recuperados: 3
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