The Bordeaux mixture was first time used for the control of

Solution (By Examveda Team)

The Bordeaux mixture was first time used for the control of Downey mildew of grape vines. Bordeaux mixture is a mixture of copper(II) sulphate (CuSO₄) and quicklime (CaO) used as a fungicide.
It is used in vineyards, fruit farms and gardens to prevent infestations of downy mildew, powdery mildew and other fungi.
It is sprayed on plants as a preventive treatment, but its mode of action is ineffective after a fungus has become established.