Burgundy mixture was discovered in 1987 as a substitute of:

Correct option is B

Burgundy mixture is a copper-based fungicide, developed as an alternative to Bordeaux mixture, one of the earliest fungicides in agricultural history.
�� Why (b) Bordeaux Mixture is the Correct Answer:
· Bordeaux Mixture:
· Composed of copper sulfate (CuSO₄) and hydrated lime (Ca(OH)₂).
· Discovered in 1885 by P.A. Millardet to control downy mildew of grapes.
· Burgundy Mixture:
· Formulated using copper sulfate (CuSO₄) and sodium carbonate (Na₂CO₃) instead of lime.
· Designed as a chemical substitute for Bordeaux mixture to avoid the disadvantages of lime such as clogging sprayers and incompatibility with some pesticides.
· Advantages of Burgundy Mixture:
· Easier to prepare and apply.
· Has similar efficacy in controlling fungal diseases.
· Less phytotoxic in some situations and compatible with more pesticides.
· Year of Introduction:
· Though some sources may mention earlier experimental use, it was formally recognized and widely adopted around 1987.