There are two products you should investigate. The first is Abound which contains azoxystrobin and is rated for vegetable use. Please investigate it VERY carefully before purchasing. Quadris is another product that contains azoxystrobin but with another fungicide to increase efficiency. The second is Agri-fos which is based on phosphorus the best I recall. These should be used alternating to give best control. As with most fungicides, they MUST be used before an infection, there is no such thing as "curing" late blight once it has reached threshold levels.
You may get recommendations for chlorothalonil, copper, neem, etc. These are at best moderately effective though neem alternated with copper can be a useful combination.
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