Bordeaux mixture

From Bordeaux in France, where it is used on vines.

Bordeaux mixture (countable and uncountable, plural Bordeaux mixtures)

1. A mixture of copper sulfate and lime that is sprayed on plants as a fungicide.
   • 1891 November 16, The Times, pg 12 col A:

     Reports are coming to hand from a very large number of districts as to the success which has attended the use of the Bordeaux mixture (sulphate of copper and lime) as a preventive of potato disease.