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Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?
A
Loose smut of wheat
B
Black rust of wheat
C
Bacterial leaf blight of rice
D
Downy mildew of grapes
Detailed Solution
Bordeaux mixture is a fungicide made of copper sulphate, lime (calcium hydroxide) and water.
It was discovered by Pierre Millardet in 1882 at Bordeaux in France.
He noticed that grapevines along the roadside, which had been daubed with a mixture of copper sulphate and lime to discourage theft, remained free from downy mildew.
Downy mildew of grapes is caused by the oomycete Plasmopara viticola, and Bordeaux mixture proved very effective in controlling it.
Loose smut and black rust of wheat are fungal diseases not linked with this discovery, and bacterial leaf blight of rice is a bacterial disease.
So the discovery of Bordeaux mixture is linked to downy mildew of grapes.
It was discovered by Pierre Millardet in 1882 at Bordeaux in France.
He noticed that grapevines along the roadside, which had been daubed with a mixture of copper sulphate and lime to discourage theft, remained free from downy mildew.
Downy mildew of grapes is caused by the oomycete Plasmopara viticola, and Bordeaux mixture proved very effective in controlling it.
Loose smut and black rust of wheat are fungal diseases not linked with this discovery, and bacterial leaf blight of rice is a bacterial disease.
So the discovery of Bordeaux mixture is linked to downy mildew of grapes.