Onions, Perenospora destructor, Western Australia
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DOWNY mildew of onions, caused by the fungus Peronospora destructor, is widespread in Western Australia.
In market gardens adjacent to Perth where the majority of onions are grown the disease occurs each year in spring and early summer crops and often attains epidemic proportions.
Doepel, R F.
"Downy mildew of onions,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 1
, Article 5.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol1/iss9/5