A) Copper sulphate
B) Calcium oxide
C) Both [a] and [b]
D) None of the above
Correct Answer: B
Solution :
Bordeaux mixture was discovered by Millardet in France in 1882. Bordeaux mixture is prepared by dissolving 40 g of copper sulphate and 40 g of calcium hydroxide in 5 L of water. Bordeaux mixture is used primarily as a fungicide. It was first used to control downy mildew disease of grape-wine caused : fungus, Plasmopara viticola. The first pesticide to be used commercially was Bordeaux mixture.
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