What Causes Dark Lawn Spots
Irregular patches in your lawn or areas of delicate, light-colored webbing are indicative of a fungal disease which may occur for any number of reasons including:
Extremely wet conditions or weather
Poor air circulation
Lack of sunlight
2. Chinch Bugs
Chinch Bugs are often confused with lawns suffering from drought. Chinch bug damage will start with yellow grass that slowly turns brown and dies. As the grass dies, chinch bugs will move to the perimeter of the dead grass, causing dead patches of grass to spread outward.
3. Improper Mowing Techniques
Mower blades that are situated too low or are too dull can damage grass blades and cause bare patches.
Dogs or cats that tend to urinate in the same area can cause dead patches over time due to the high concentrations of nitrogen in the urine.
Herbicides, pesticides, gasoline, or any other types of chemicals can quickly kill your grass. Look for a brown patch that is in the exact shape of the spill or in the area where you may have mixed chemicals or topped up your mower.
In climates where salt is used to keep sidewalks and driveways clear in the winter, brown patches may appear in areas where the salt came in contact with the grass once the snow has melted.
7. Foreign Objects
Toys, swimming pools, garden hoses, and other objects may leave behind a dead patch after they have been removed.