Which of the following disease is caused by a fungus?

Question

$\begin {array} {1 1} (1)\;Yellowing \: disease\: of\: peach & \quad (2)\;Root\: rot\: of\: apple \\ (3)\;Exocortosis\: of\: citrus & \quad (4)\;Crown\: gall\: of\: pear \end {array}$