The answer to 'why is my sod pests' is that your sod may be infested with insects or other pests that are damaging the grass. Common sod pests include grubs, chinch bugs, mole crickets, and sod webworms. These pests feed on the roots and blades of the grass, causing it to turn brown, wilt, and die.
Some signs of sod pest infestation include irregular brown patches, thinning grass, and the presence of the pests themselves. To address the problem, you may need to use insecticides or other pest control methods. In some cases, you may need to completely resod the affected area. If the infestation is severe or you're unsure of the cause, it's best to call a professional landscaper or pest control specialist for an inspection and treatment recommendations.