Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of systemic downy mildew of opium poppy caused by Peronospora somniferi in Australia.

Abstract

In the 2013/14 season, stunted opium poppy (Papaver somniferum) plants with chlorotic distorted leaves, little or no necrosis and profuse abaxial sporulation were observed within commercial crops in Tasmania, Australia, for the first time. Affected plants also had strongly distorted stems. In the 2014/15 season, the incidence of plants with systemic downy mildew symptoms was widespread and resulted in complete crop loss in some fields. The causal pathogen was identified as Peronospora somniferi based on morphological and molecular analyses. This is thought to be the first record of P. somniferi in Australia.