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Reinstating Ceratobasidium lantanae-camarae: the white thread blight fungus on the pantropical weed Lantana camara

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Abstract

Ceratobasidium lantanae-camarae was a name proposed for a fungus associated with white thread blight disease of Lantana camara (common lantana): a Brazilian native plant listed amongst the world’s ten worst weeds. This fungus was found during surveys in Brazil to assess the potential of coevolved fungal pathogens as classical biocontrol agents in the Paleotropics and Australasia. Later, in a monograph on Rhizoctonia forming-fungi, C. lantanae-camarae was synonymized with C. cornigerum: a polyphagous species recorded worldwide, but never previously from Latin America. The lack of pure cultures of C. lantanae-camarae did not allow a verification of the true status of the white thread blight fungus on lantana. Recently, the lantana disease was observed in localities in the Brazilian states of Rio de Janeiro and Amazonas. Pure cultures were obtained, DNA was extracted and phylogenetic analyses of the ITS-5.8S rDNA region were performed. Results showed that C. lantanae-camarae and C. cornigerum are phylogenetically distinct and that their synonymization was a taxonomic error. It was also found that, although C. lantanae-camarae is phylogenetically close to C. papillatum, morphological differences between these two species are evident. Thus, the name C. lantanae-camarae is re-established herein: an epitype and a reference ex-epitype sequence are indicated, resolving this taxonomic issue. Additionally, Koch’s postulates were fulfilled for the first time. The significance of this taxonomic elucidation for weed biocontrol is discussed.

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Acknowledgments

This work was conducted with funds provided by the Brazilian Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). We would like to dedicate this paper to the late Dr. Carol A. Ellison who pioneered the research on Ceratobasidium lantanae-camarae and the use of fungal pathogens for the biological control of Lantana camara. Dr. H. C. Evans is acknowledged for reading and polishing this manuscript.

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Correspondence to R. W. Barreto.

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Ferreira, B.W., Nóbrega, T.F. & Barreto, R.W. Reinstating Ceratobasidium lantanae-camarae: the white thread blight fungus on the pantropical weed Lantana camara. Australasian Plant Pathol. 50, 545–557 (2021). https://doi.org/10.1007/s13313-021-00790-4

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  • DOI: https://doi.org/10.1007/s13313-021-00790-4

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