Gypsum also facilitates the removal of excess salt away from the turfgrass root zone. Excess salt creates growth problems along the edges of curbs, sidewalks and driveways where it has been used for melting snow and ice. Gypsum should be applied at a heavier rate in those areas. Fungus Disease Most Fungus disease problems increase during hot summer weather. Thick, thatchy lawns that are not mowed or watered properly are likely candidates for disease.
Damage usually shows up as discrete small spots of discolored turf.
The sunniest areas of the lawn are usually the first to show damage. As the disease progresses, the spots enlarge and coalesce to form large patches. If left unchecked, large areas may be killed out. Some fungi are easier to control than others. In any case, it is important to use the correct fungicide for a particular disease.