Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?

Step-by-step solution

Bordeaux mixture was discovered by Millardet in France in 1882 . It is prepared by dissolving 40 ~g of copper sulphate and 40 ~g of calcium hydroxide in 5 ~L of water. It was first used to control downy mildew disease of grape-vine that is caused by a fungus Ptasmopara viticota. Black rust of wheat is caused by Puccinia graminis tritici. The use of fungicide Dithane Z-78 and Dithane M-45 control the disease even at lower concentration. Loose smut of wheat is caused by Ustilago trittict. The use of fungicides (syste