Question

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

• A. Loose smut of wheat
• B. Downy mildew of grapes
• C. Bacteria; leaf blight of rice
• D. Black rust of wheat

Answer 1

The correct option is B

Downy mildew of grapes

The correct option is B.

The explanation for the correct option :

1. It is a chemical made by combining copper sulfate and calcium hydroxide in water.
2. It was discovered as a fungicide by a French botanist, Pierre Marie Alexis Millardet.
3. It works against vines, fruit and nut trees, and ornamental plants.
4. Pierre Marie Alexis Millardet prepared the first synthetic fungicide accidentally in 1882 against Plasmopara viticola (downy mildew) of grapevine.
   

The explanation for the incorrect option:

Option A:

Bordeaux Mixture cannot be used against wheat smut because it is only effective against vines, nuts, fruits, and ornamental plants.

Option C:

Bordeaux mixture is a fungicide and bactericide, but it only works against vines, nuts, fruits, and ornamental plants.

Option D :
Bordeaux Mixture cannot be used against wheat rust because it is only effective against vines, nuts, fruits, and ornamental plants.

Final answer: Downy mildew of grapes is linked to the discovery of Bordeaux Mixture as a popular fungicide.