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• Pierre-Marie-Alexis Millardet, a French botanist, is credited with discovering the Bordeaux mixture in the 1880s. Here's why this answer is correct and some key facts about this discovery:
-In the 19th century, European vineyards were devastated by downy mildew, caused by the water mold Plasmopara viticola.
-Millardet noticed that grapevines along roadsides, sprayed with copper sulfate and lime to prevent theft, stayed healthy and free from downy mildew.
-Through systematic experimentation, Millardet developed the Bordeaux mixture as an effective fungicide.
-The Bordeaux mixture quickly became a standard treatment for downy mildew and other fungal diseases in various crops.
-This discovery transformed plant disease control and significantly impacted the wine industry.

🔑Key Points:

• Bordeaux Mixture:
-Bordeaux mixture is a mixture of copper sulphate solution and calcium hydroxide (simply called lime).
-The copper sulphate solution is what gives Bordeaux mixture its fungicidal properties.
-The lime helps to stabilize the copper sulphate solution and make it less likely to leach out of the soil.
-Bordeaux mixture is a commonly used fungicide for controlling a variety of plant diseases, including powdery mildew, downy mildew, and black spot.
-It is also effective against some insect pests.
-Bordeaux mixture is relatively inexpensive and easy to make.
-However, it can be harmful to humans and animals if ingested, so it is important to use it carefully.