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Effect of physio-chemical seed treatments on opium poppy downy mildews caused by Peronospora meconopsidis and P. somniferi


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Thangavel, T ORCID: 0000-0002-8800-0990, Scott, J ORCID: 0000-0001-9443-4384, Jones, S ORCID: 0000-0003-1014-4772, Gugalothu, R and Wilson, C ORCID: 0000-0001-5434-3816 2020 , 'Effect of physio-chemical seed treatments on opium poppy downy mildews caused by Peronospora meconopsidis and P. somniferi' , PLoS ONE, vol. 15, no. 4 , pp. 1-18 , doi: 10.1371/journal.pone.0230801.

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Downy mildew of opium poppy is the single biggest disease constraint afflicting the Australian poppy industry. Within the pathosystem, the transmission of infections via infested seed is of major concern. Both downy mildew pathogens of poppy; Peronospora meconopsidis and P. somniferi, are known contaminants of commercial seed stocks. Using seed naturally infested with these pathogens, the effect of physio-chemical seed treatments on seedling health and disease transmission were evaluated. Individual seed treatments were tested to determine optimal treatment parameters for each; including incubation time, temperature and treatment concentration. Optimised physiochemical treatments were then compared. The most effective treatment methods were seed washes in acidified electrolytic water (400 ppm hypochlorous acid for 5 min) and hypochlorite solution (2% NaOCI for 5 min). In seed to seedling transmission assays, these two treatments reduced transmission of P. somniferi by 88.8% and 74.61%, and P. meconopsidis by 93.3% and 100%, respectively. These methods are recommended for seed treatment of commercial opium poppy seed to assist in the control of the downy mildew diseases.

Item Type: Article
Authors/Creators:Thangavel, T and Scott, J and Jones, S and Gugalothu, R and Wilson, C
Keywords: poppy downy mildew, Peronspora
Journal or Publication Title: PLoS ONE
Publisher: Public Library of Science
ISSN: 1932-6203
DOI / ID Number: 10.1371/journal.pone.0230801
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Copyright © 2020 Thangavel et al. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

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