Here are 12 of the most common pest or disease problems associated with lawn, with a brief description of the symptoms and remedies: 

Pest Symptom Main Remedy
Black Ants Unsightly mounds Boric acid
Fire Ants Skin irritant and animal health risk Organic Bait (spinosad)
Moles Soil tunneling Remove grubs
White Grubs Severed roots Beneficial nematodes, milky spore
Dollar Spot Bleached spots Repair drainage and add nitrogen
Brown Patch Round brown patches Reduce nitrogen
Chinch Bugs Round yellow patches Water heavily; rosemary oil
Billbugs Yellow or brown patches Dethatch
Sod Webworms Small, irregular dead spots Beneficial nematodes
Mole Crickets Tunneling Beneficial nematodes
Other Fungal Diseases Various ellow or brown patches Reduce water
Dog Spot Dead spots ringed in dark green Yucca supplements for dogs