Pad decay affects the cactus segments or pads. Cut out and destroy diseased parts and avoid wounding. Slimy collar rot causes a soft, slimy, black rot at the base of the plant. There is no effective control. Soft rot or gray mold causes tissue discoloration then rotting and collapse of the upper surface.
Plant tissues undergo a slimy disintegration.
Under moist conditions a gray mold develops on the surface of diseased parts. Remove diseased tissue. Bud fall is the premature dropping of flower buds. Possible causes are, lack of nourishment, excessive nitrogen, excessive soil dryness, overwatering, and syringing with cold water. Corky scab causes irregular, rusty or corky spots on stems.