Likely one of the most deadly lawn pests on this list, armyworms can severely damage your lawn in one fell swoop. Even though they do not kill your lawn permanently, as long as they are present they will continue to feed on your lawn’s leaf blades making it look horrible and unhealthy. Armyworms are actually just moth larvae, that travel in a pack, or an “army.” These worms will slowly eat away the shell of your turf blades, making them appear to be clear in the process. Damage will initially resemble the stress of drought, but your foliage can be lost in its entirety if left untreated. You can be tipped off to an armyworm infestation by the distinct y shape on their heads, and the small, white, spherical eggs they leave across your landscape.