Paraphoma crown rot of pyrethrum (Tanacetum cinerariifolium)

Azin Moslemi, Peter Kevin Ades, Tim Groom, Pedro Crous, Marc Edward Nicolas, Paul William James Taylor

    Research output: Contribution to journal/periodicalArticleScientificpeer-review

    16 Citations (Scopus)

    Abstract

    Pyrethrum (Tanacetum cinerariifolium) is commercially cultivated for the extraction of natural pyrethrin insecticides from the oil glands inside seeds. Yield-decline has caused significant yield losses in Tasmania during the last decade. A new pathogen of pyrethrum causing crown rot and reduced growth of the plants in yield-decline affected fields of northern Tasmania was isolated from necrotic crown tissue and described as Paraphoma vinacea. Multigene phylogenetic identification of the pathogen also revealed that P. vinacea was a new species different from other Paraphoma type strains. Glasshouse pathogenicity experiments showed that P. vinacea significantly reduced below-ground and total biomass of pyrethrum plants two months after inoculation. Dull-tan to reddish-brown discoloration of the cortical and sub-cortical crown tissue was observed in 100% of the infected plants. Paraphoma vinacea infected 75% of the plants inoculated with root dip and soil drench inoculation techniques in an inoculation optim...
    Original languageEnglish
    Pages (from-to)2363-2369
    JournalPlant Disease
    Volume100
    Issue number12
    DOIs
    Publication statusPublished - 03 Aug 2016

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