Ray blight of pyrethrum in Australia: a review of the current status and future opportunities

Bhuiyan, M. A. H. B. and Vaghefi, N. and Taylor, P. W. J. (2019) Ray blight of pyrethrum in Australia: a review of the current status and future opportunities. Plant Pathology. ISSN 0032-0862

Abstract

Ray blight caused by Stagonosporopsis tanaceti is one of the most important diseases of pyrethrum (Tanacetum cinerariifolium), a perennial herbaceous plant cultivated for the extraction of insecticidal pyrethrins in Australia. The disease is responsible for complete yield loss in severe outbreaks. Infected seed is considered as the principal source of S. tanaceti. Infection hyphae remain only in the seed coat and not in the embryo, resulting in pre- and post-emergence death of seedlings and latent infection. Therefore, quantification of the level of infection by S. tanaceti within seed using a qPCR assay is important for efficient management of the disease. Stagonosporopsis tanaceti completes its life cycle within 12 days after leaf infection through production of pycnidia and can infect every tissue of the pyrethrum plant except the vascular and root tissues. Ray blight epidemics occur in pyrethrum fields through splash dispersal of pycnidiospores between adjacent plants. Besides steam sterilization, thiabendazole/thiram and fludioxonil are effective seed-treating chemicals in controlling S. tanaceti before planting begins. Ray blight is currently managed in the field through the foliar application of strobilurin fungicides in the first 1–2 years of crop establishment. Later on, difenoconazole and multisite specific fungicides in the next 2–3 years during early spring successfully reduce ray blight infestation. Avoiding development of resistance to fungicides will require more sustainable management of ray blight including the development and deployment of resistant cultivars.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2019 British Society for Plant Pathology. Accepted version embargoed until 1 April 2020 (12 months), in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 27 Mar 2019 02:43
Last Modified: 27 Mar 2019 02:45
Uncontrolled Keywords: disease control; ray blight; Stagonosporopsis tanaceti; Tanacetum cinerariifolium
Fields of Research : 06 Biological Sciences > 0607 Plant Biology > 060704 Plant Pathology
Identification Number or DOI: 10.1111/ppa.13000
URI: http://eprints.usq.edu.au/id/eprint/35866

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