Oidium: A vine disease caused by the fungus Uncinula necator, which usually attacks young leaves and stems. Its main sign is the appearance of a white or grey-coloured floury or cottony layer - it is also known as powdery mildew. In a strong attack, the leaves turn yellow and then dry out. Oidium attacks the vine due to a combination of factors, including the weather - low light conditions and excessive humidity, as well as fertilisers with excessive amounts of nitrogen.
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