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Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide ?

$\begin {array} {1 1} (1)\;Black\: rust\: of\: wheat & \quad (2)\;Bacterial\:leaf\: blight\: of\: rice \\ (3)\;Downy\: mildew\: of\: grapes & \quad (4)\;Loose\: smut\: of \: wheat \end {array}$

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