Too Much or Too Little Water.
All lawns are subject to lawn diseases, but malnourished and ill-maintained lawns are most susceptible. Most lawn diseases are caused by some type of fungus that invades the soil and grass blades. Fungal spores can be spread across your lawn by wind, rain, insects, contaminated soil and foot traffic on wet grass.
Common lawn diseases include:
All of these lawn diseases, except mushrooms, can cause serious lawn damage. Proper treatments are essential to eliminate existing lawn diseases and prevent them from spreading. If you notice bare spots; brown or yellow spots; dead patches of grass; white, cob-web like spots; bright green patches; or reddish-brown grass blades, contact your local lawn care professional who can help you with lawn care questions on specific lawn diseases.