Key tips to help control powdery mildew.
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Factsheets & other resources
In most parts of south-eastern Australia, season 2010–11 was the wettest since 1973–74 and 1974–75, surpassing the difficult seasons of 1992–93 and 1983–84.
The wet conditions brought three waves of assault on vineyards by diseases: first downy mildew, then powdery and finally the bunch rots. Let’s look at these three, ask what, if anything, can be done about them now and briefly look forward in readiness for the best controls in 2011–12.
Power point presentation.
Powdery mildew produces irregular yellow blotches that are best seen on the upper surfaces of leaves and, on varieties like Chardonnay, it produces browning of the smallest (tertiary) veinlets on the undersides of leaves.
Powdery mildew is driven by the amount of inoculum (spores) inherited from last season. In much of Australian viticulture, the disease progresses more or less independent of the weather, though in cool climates, temperature may be limiting at times. Powdery mildew is common across Australian vineyards. With a better knowledge of disease epidemiology (ie how the disease spreads), of the need to time sprays appropriately and, with improved spray technology and an excellent array of fungicides, direct crop loss from powdery is minimal.