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If you see concentrated areas of damage in your lawn, you first need to determine what is causing the damage, insects or disease.
Four Ways to Reduce Insects in your Lawn:
View this video to help you identify insects that commonly damage lawns
Once you identify what kind of insect is damaging your lawn, you will want to apply an insecticide specifically labeled to control that insect. Be sure the product you chose breaks the life cycle by killing both the adult and infant.
For example, to rid your lawn of billbugs, you will need one ingredient to kill the adults and another to kill the infant larvae.
If you are not sure what insect is damaging your lawn, apply a broad spectrum insecticide. If you use a granular variety, water your lawn immediately after application to help get it into the soil.
If you do not see any insect damage but want to be proactive, apply a broad spectrum insecticide once a year. July or August are good months to apply. Again, if you use a granular variety, water your lawn immediately after application to help get it into the soil.
A WORD OF CAUTION FOR NEWLY SODDED LAWNS
A pre-emergent contains a chemical that prevents a weed from putting down roots. Because it is a root inhibitor, it can also negatively affect your new lawn, which is trying to establish itself by putting down roots.
If you successfully killed and removed your old lawn, including all the weeds in it, your newly sodded lawn should have relatively few weeds. It is suggested that you hand pick weeds out of your newly sodded lawn for the first season.