The grapevine downy mildew is caused by Plasmopara viticola, fungus native to North America. Most of the American vines have acquired over the millennia is highly resistant to pest, the European vines are still very subject. At the end of the last century due to blight was serious damage, that would, in many cases the abandonment of the crop. This disease affects all organs of the green plant, the youngest leaves are stained on the various points of the flap (oil spots) on older leaves generates a mosaic of small patches in the lower page and see a white mildew - gray. The worst damage produced by the attacks on the bunches, the berries take on a brown color - reddish and withered. Infections are particularly intense to be expected at the end of very wet winters. An effective cure is a mixture made of copper sulphate and lime, this mixture is called Bordeaux mixture.
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