7.  Sod Webworms
From mid-May to October the grass turns brown in patches the size of a saucer in the hottest and driest areas of the lawn. These areas may expand to form large irregular patches. Grass blades are chewed off at the soil level. Silky white tubes are found nestled in the root area. Inside are light-brown or gray worms with black spots, from ¼ to ¾ inch long. White or gray moths fly in a zigzag pattern over the lawn in the evening. When a moth lands it folds its wings along the body, rather than letting them spread like most moths.