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# Butler extensively studied the following disease

$\begin {array} {1 1} (1)\;Red\: hot \: of \: sugarcane & \quad (2)\;Smut \: disease\: of\: Sorghum \\ (3)\;Blast\: disease\: of \: rice & \quad (4)\;Tikka\: disease\: of \: groundnut \end {array}$

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