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.