As Root Rot progresses, the leaves will begin to darken. Leaves darken . They appear brown or black in color. Leaves wilt . They may appear translucent brown with a soft, jelly-like consistency.
Plant growth is slow .
Treatment First, isolate the infested plant. If possible, move it to another room altogether. Next, you must remove any dead or dying tissue from the leaves, stems and roots. To get to the roots, remove the plant from its pot and gently shake off all the soil. Wherever you have removed unhealthy tissue, dust with sulfur to help prevent further infection.