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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 Wilson
Downy 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 Symposium

Pagination

1-2

Department/School

Tasmanian Institute of Agriculture (TIA)

Place of publication

Australia

Event title

10th Australasian Soilborne Diseases Symposium

Event Venue

Adelaide, South Australia

Date of Event (Start Date)

2018-09-04

Date of Event (End Date)

2018-09-07

Repository Status

  • Restricted

Socio-economic Objectives

Plant extract crops

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    University Of Tasmania

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