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Question
Which one of the following is linked to the discovery of bordeaux mixture as a popular fungicide?
Which one of the following is linked to the discovery of bordeaux mixture as a popular fungicide?
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Solution
The correct option is C Downy mildew of grapes
Bordeaux mixture was discovered by Millardet in France in 1882. It is prepared by dissolving 40 g of copper sulphate and 40 g of calcium hydroxide in 5 L of water. It was first used to control downy mildew disease of grape-vine that is caused by a fungus Plasmopara viticola. Black rust of wheat is caused by Puccinia graminis tritici. The use of fungicide Dithane Z-78 and Dithane M-45 control the disease even at low concentration. Loose smut of wheat is caused by Ustilago tritici. The use of fungicides (systemic fungicide like D-735 and F-461) give good results. Hence, option B is correct.
Bordeaux mixture was discovered by Millardet in France in 1882. It is prepared by dissolving 40 g of copper sulphate and 40 g of calcium hydroxide in 5 L of water. It was first used to control downy mildew disease of grape-vine that is caused by a fungus Plasmopara viticola.
Black rust of wheat is caused by Puccinia graminis tritici. The use of fungicide Dithane Z-78 and Dithane M-45 control the disease even at low concentration. Loose smut of wheat is caused by Ustilago tritici. The use of fungicides (systemic fungicide like D-735 and F-461) give good results. Hence, option B is correct.
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