What are the damage symptoms of wilt and stem rot in marigold and how it can be controlled?

The fungus affects the collar portions of their plants. In the nursery, the infection results in damping-off and is characterized by soil moisture. In the field, the infected plants show wilting. French marigold and dwarf varieties are less susceptible whereas the African Kinds are highly susceptible to the disease. It can be controlled by soil treatment with Captan, Mancozeb, Metalaxyl, and Fosetyl-Al to control this disease.