Introduction to Turf Damaging Lawn Diseases

What are Lawn Diseases?

Lawn and turfgrass diseases are abnormal conditions on turf caused by a disease organism or pathogen. They can be difficult to identify because they share many similar symptoms with other lawn problems.

The Lawn Disease Process

For a turfgrass disease to exist, three primary components must exist at the same time. These are the Pathogen, the correct Environment, and the Host. If any of the three are missing the disease cannot thrive.

1) The Pathogen – The organism that infects the host and causes damage
2) The Environment – Environmental conditions, like temperature and moisture that favor pathogen development or reduce lawn health.
3) The Host – A grass variety or species that is susceptible to the pathogen

How to spot Lawn Diseases in Your Lawn

Leaf spots, brown areas or patches of dead grass may look like damage caused by disease, but they do not automatically indicate there is a disease present. Mowing with a dull blade, scalping, lawn damaging insect activity or poor irrigation can also cause symptoms in your lawn that might be confused with a turfgrass disease. Read more about Turfgrass Diseases.

Each Lawn Disease page that we feature provides identifying attributes of the individual grass, images of each turf disease, and the best control methods to eradicate your lawn of each Lawn Disease type. Click on the images below for a sample of our Common Lawn Disease Pages:

Lawn Disease Types


Gray Leafspot


Brown Patch

See all Lawn Diseases

Other Common Lawn Care Topics

Scotts LawnService is the trusted industry leader for professional quality lawn care. Our exclusive lawn care products include Scotts® premium grass seeds and Scotts® professional-grade fertilizers, and Ortho® Disease Conrol Pro™; our lawn service teams are comprised of highly trained, industry-certified professionals. Contact a representative today for lawn disease control options available in your area and to learn how you can enjoy a lush, thicker lawn that only Scotts LawnService can deliver.