Signs of mildew
My Pinot Noir has some signs of downy mildew. It's the first time I've had to deal with this - in the past the problem has been oidium (powdery mildew), which is prevented by using elemental sulfur.
Downy mildew manifests as pale patches on the leaves, known as 'oil spots'; when you turn the leaves over, you can see the fungal infection. To prevent the mildew spreading, I've had to spray with copper (Bordeaux mixture).
Both copper and sulfur are allowed in organics and biodynamics.