The disease starts on the lower leaves and progresses upward. Varieties of african marigolds are most susceptible. Sprays of basic copper sulfate will control the disease. Stems infected with wilt and stem rot turn brown and shrivel at the soil line. The foliage wilts and the plant dies.
African types are most susceptible.
Remove and destroy infected plants. There is no chemical control. Aster yellows is becoming more of a problem on marigold. Control the insects which carry the disease. There is no chemical control.