Detection of Peronospora somniferi in Tasmania and Victoria

Date de publication
lun, 13 Jul 2015, 03:50
Dernière mise à jour effectuée le
juil. 13, 2015, 3:50 matin
Report Number
AUS-68/1
Pays
Australia
Identité de l'organisme nuisible
Peronospora somniferi - (PEROSM)
Situation du signalement
Préliminaire
Hôtes
Papaver somniferum (Alkaloid poppy)
Situation de l’organisme nuisible
  • Present: but managed
Distribution géographique
Tasmania and Victoria
Résumé

Industry is taking a number of steps to help eliminate the disease from crops in Victoria in advance of the 2015 growing season. These include the development of more sensitive seed-testing protocols to ensure clean seed is used for planting, developing improved fungicide treatments for seed, adopting planting practices that involve crop rotation and selecting sites that are less conducive to disease development.

Until relatively recently, downy mildew on all Papaver species were assumed to be the single species, Peronospora arborescens. With the advent of molecular taxonomy, the species has been revisited and a recent paper by Voglmayr et al. (2014) describes two species infecting Papaver somniferum (Peronospora meconopsidis and P. somniferi).

Peronospora somniferi causes discoloured blotches on the upper leaf surface (pale green to purple brown) with grey-purple mould-like growth on the lower surface of Papaver somniferum leaves, corresponding to the blotches on the upper surface. Severely affected leaves are shrivelled and brown, and the plants are stunted.

Danger
Peronospora somniferi has been found in Tasmania and Victoria. There have been no detections of Peronospora somniferi anywhere else in Australia. In 2014, five to ten percent of the poppy crops in Tasmania had been affected. Australia is still well placed to supply the required volume of alkaloid poppies for the production of therapeutic and medicinal products.
Contact pour demandes d'information
Australian Chief Plant Protection Officer Australian Government Department of Agriculture GPO Box 858 Canberra ACT 2601 IPPC.contactpoint@agriculture.gov.au
Mots-clés associés au thème
Mots-clés associés à la marchandise

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