Types of lawn insects
Sod Webworms

These caterpillar-like worms are usually gray or greenish-brown, with fine hairs covering their dark-spotted bodies. Sod webworms are approximately one inch long. Their light brown heads resemble those of caterpillars. These pests feed off grass and root systems throughout summer. They love sunny, dry areas. The damage from sod webworms appears as if moth eaten or water deprived. To determine if you have an infestation of webworms, mix a couple gallons of water with two tablespoons of liquid dish soap. Pour or spray over a small portion of the affected area. If the webworms appear, treat your lawn with an insecticide
Mole Crickets

One of the most damaging turf grass insects is the mole cricket. These brownish-gray winged pests tunnel extensively through soil, eating the grasses. They range from one to two inches in length, and have sharp projections from their front legs, which are used for digging. Mole crickets are hard to find, but are seen mostly in the evening during warm weather, when soil is moist. Mole cricket damage appears as brown spongy areas within normal, healthy sections or your lawn. They are difficult to extinguish, and the types of pesticides used may change according to area and season. Consult a professional if possible
Aphids

Aphids range in size from 1/16 to 1/8 inch long. They have long antennae and legs and pear-shaped bodies. Although aphids love flowers and many types of plants, they also live found in grass. If ants are present, you likely also have aphids, since ants are known to farm aphids for their sticky honeydew secretions. To remove aphids, first spray the area with a heavy stream of water. Ladybugs are their natural predators. Many garden shops sell ladybugs to help control aphid populations. If this does not work, you may need to consider using a pesticide
Grub Worms

Grub worms are the larvae of beetles. They are approximately one inch long and are C-shaped, cream colored worms with brown heads and six legs The lower section of the grub worm may appear dark brown from soil showing through. Grub worms feed off the roots of Florida grasses, especially St. Augustine and Bermuda. If your lawn is yellow or dying, feels spongy underfoot, or if you've seen wild animials or birds digging in your yard, these may be signs of grub worms. Cut a section of grass and soil in the affected areas. Sift through the dirt and if grub worms are present, depending on the damage and the number of worms, you may need a pesticide.
Chinch Bugs

One of the most common Florida lawn insects is the chinch bug. This thin, black pest ranges from 1/8 to 1/5 inch long with a triangular marking on its back. Its white, folded wings vary from short to long. Many chinch bugs do not fly. The most common type of Florida grass, St. Augustine, is a favorite for chinch bugs, but these pests will multiply in most types of turf grass. They love sunshine and congregate in areas near driveways, sidewalks and toward the center of lawns. If you notice yellowing, slow growth or dead grass, inspect near the area of damage to see if chinch bugs are present.