High salt concentrations will impact turfgrass health resulting in a plant more susceptible to diseases. If you have areas in the lawn or landscape that appear to dry out first or are the first to appear 'sick', use a metal rod to be sure that there is nothing buried at that location. It is not uncommon to find building materials buried in the landscape. If you have an area that is water logged for long periods, build that area up and make it level with the rest of the lawn. Fungicide is the name for a pesticide used to manage fungal diseases.
Fungicides suppress or slow down fungal growth or prevent the fungus from reproducing.
Most fungicides are active against a limited group of fungi. This is why it is important to know what disease you need to control. Fungicides do not promote the growth of the turfgrass. The only way healthy turfgrass will reappear is when new growth occurs. This diseased leaf area will remain until it is removed by mowing, and a new leaf replaces it.