Copper sulphate: locut. Copper sulfate is arguably the most famous fungicide used for treating grapevine. Who does not know this Bordeaux mixture and its very characteristic blue color, a mixture of copper sulphate and dead lime, then diluted in water (it turns blue on contact) before being sulphated on the foliage? We have not yet found a better treatment against mildew, a terrible fungal disease of the vine other than these salts of ...
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