oil spot

Noun

 * 1) A spot consisting of oil; for instance, in the ocean subsequent to an oil spill.
 * 2)  One of the yellow spots, often circular in shape, on the upper leaf surface of grapevines in the early stages of downy mildew (caused by  infection).

Related terms

 * oil drop

Translations

 * Czech: ropná skvrna
 * Finnish: öljyläikkä
 * Hungarian:
 * Norwegian: oljeflekk