Agricultural information provided to farmers jointly by Reliance Foundation and Acharya NG Ranga Agricultural University: In cotton, the leaves of plants infected with Fusarium wilt, first turn yellow in mid-summer, then turn red, and the leaves dry up from the bottom up and fall off. If you open the stem, you will see streaks with black mold inside. For prevention, pour a solution of 3 g of copper oxychloride or 1 g of carbondioxide per liter of water on the soil around the roots of the infected plants.