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

1. Bacterial leaf blight of rice
2. Downy mildew of grapes
3. Loose smut of wheat
4. Black rust of wheat

Correct answer: Downy mildew of grapes

Solution

Bordeaux mixture was discovered and popularized as a fungicide for controlling downy mildew in grapes. It is a classic copper sulfate-lime spray first used successfully in vineyards.

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