If you see death spots on your grass, it is probably that you have mole crickets. Mole crickets are destructive insects that damage turfgrass lawns by tunneling through the soil near the surface and feeding on the roots of the grass. The male is the one that makes the noise with its wings to call the female to breed. You can buy different treatments to control infestation or to kill them after, but since they fly, you'll have new ones that will probably not die.
How to kill them on the spot?
Use a detergent that contains lemon. I use Ajax. The lemon will asphyxiate them and in about 1 minute or 2, they die. Mix about 1.5 fluid ounces of liquid dishwashing soap into 2 gallons of water and pour the mixture over 4 square feet of turf.
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