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

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

BHUBHU 2010

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 Plasmopara viticola. 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 tritici. The use of fungicides (systemic fungicide like $D-735$ and $F-461$ ) give quite encouraging result.