The answer to 'why is my sod brown patches' is that there are several common causes, including drought, disease, pests, or improper care. Brown patches in sod can be a sign of stress or damage to the grass, which can have a variety of underlying issues.
Some of the most common causes of brown patches in sod include: lack of water, fungal diseases, insect infestations, poor soil conditions, or damage from pets or foot traffic. The patches may start small but can spread quickly if the underlying problem is not addressed. Symptoms include discolored, wilting, or thinning grass in the affected areas.