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 language | English |
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Pages (from-to) | 2363-2369 |
Journal | Plant Disease |
Volume | 100 |
Issue number | 12 |
DOIs | |
Publication status | Published - 03 Aug 2016 |