Grapes, Uncinula necator, Western Australia
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POWDERY mildew or oidium, is a disease which is always present to a greater or lesser extent in grapevines in Western Australia.
In seasons favourable for its development it stunts the growth of shoots and leaves and may seriously reduce fruit yields and quality.
Most of our commonly-grown varieties are quite susceptible to the disease, but for the reason that currants are the most extensively grown variety, the overall losses are greatest in this variety.
Harvey, H L.
"Powdery mildew or oidium of grapes,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 1
, Article 15.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol1/iss8/15