Posted: 10/08/2012 at 21:14
Bordeaux Mix can be effective - it depends on whether or not you want to use it. On the plus side, it is accepted, I believe, by the soil association as being organic. But it's still a mix of copper etc that you may prefer to avoid.
Personally, I have used it successfully in the past. At the first sign of blight, I cut out all affected parts, sprayed with Bordeaux and made sure that all the fruit that was subsequently harvested was well washed.
It is called Bordeaux mixture btw because it was first used in the vineyards on Bordeaux. The blue colour was also designed to deter casual grape pickers from stealing the ripening grapes. (Or so I read somewhere - could just be an old wives' tale of course )