You’ll tackle this Infestation zone as part of the Story Mission You Got a Death Wish. There are four Nests in the area, located relatively close to each other.
This is near the starting area of the Story Mission beside the trailer truck. Don’t worry about the newts on the rooftop since they won’t attack you even if you burn this Nest down. Make sure to take out any nearby freakers in the immediate area to avoid getting overrun.
This is right beside the first Nest, inside a semi-trailer.
These two Nests are the motel rooms a few steps away from the semi-trailer Nest. There’s a lot of patrolling freakers in the parking area in front of the nests so make sure to clear them first before setting the nests on fire. Try setting fire to the nests one at a time.