Damaged turf has ragged individual blades with signs of chewing damage. With high populations, grass may be devoured down to the ground and large numbers of birds may be seen feeding in your lawn in the mornings and evenings. Young larvae skeletonize grass blades; older larvae feed on entire blades. Check for armyworms and sod webworms by mixing one ounce of lemon dish detergent with one gallon of water, then pour the solution over a one square yard area where an infestation is suspected. The detergent irritates the insects, causing them to come to the surface quickly.