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Infection by Peronospora somniferi and Peronospora meconopsidis from soil causing downy mildew of opium poppy
conference contribution
posted on 2023-05-24, 18:10 authored by Krishnamoorthy, K, Thangavel, T, Suzanne JonesSuzanne Jones, Jason ScottJason Scott, Calum WilsonCalum WilsonDowny mildew of opium poppy in Australia is caused by the obligate, oomycete pathogens Peronospora somniferi or Peronospora meconopsidis. Infections from the two pathogens lead to distinct disease symptoms; P. somniferi producing systemically infected plants that are stunted and chlorotic with profuse sporulation on foliage, whilst P. meconopsidis induced angular necrotic localized lesions with sparse sporulation. Plant infections from air-borne conidia, oospores and contaminated seed have been demonstrated. It is suspected that soil-borne inoculum may also provide important inoculum source but little is known about the process of soil-borne infection for the two species. The present study investigates the infection of poppy seedlings by the two pathogens from infested soil inoculum sources and examines subsequent pathogen spread within infected plants and disease development.
Funding
Department of Natural Resources and Environment Tasmania
History
Publication title
Proceedings of the 10th Australasian Soilborne Diseases SymposiumPagination
1-2Department/School
Tasmanian Institute of Agriculture (TIA)Place of publication
AustraliaEvent title
10th Australasian Soilborne Diseases SymposiumEvent Venue
Adelaide, South AustraliaDate of Event (Start Date)
2018-09-04Date of Event (End Date)
2018-09-07Repository Status
- Restricted