Bordeaux mixture was discovered by:

Correct option is D

· Bordeaux mixture, a mixture of copper sulfate and lime, was discovered by Pierre-Marie-Alexis Millardet in 1882.
· It is one of the earliest fungicides used to control downy mildew and other fungal diseases in grapes, potatoes, and other crops.
· The discovery was accidental when Millardet noticed that grapevines treated with the mixture showed resistance to fungal infections.
· Today, Bordeaux mixture remains an essential tool in disease management in both organic and conventional farming systems.