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Pyrethrum (Tanacetum cinerariifolium) is commercially cultivated in Australia for the production of pyrethrins. Ray blight caused by Stagonosporopsis tanaceti is considered a major limiting factor for pyrethrum production. Histopathology of infected pyrethrum plants identified the importance of crown infection where the infection hyphae were confined to the parenchyma cells of the epidermis, hypodermis...
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