On 28 Apr 2007 20:36:02 -0700, Nathanael wrote:

I applied the crabgrass preventor about a month ago, and wish to put
down some insect killer on the lawn now to keep the grass bug free for
when the kids play on it. Will this break that protective barrier that
they say the preemergent gives to the lawn?

First identify which insects you are after. Then select the product
that targets those insects and READ THE LABEL.

Many of the insects that you are concerned will bug your children are
not in the ground to begin with but fly into the area. Treating the
soil will do nothing to prevent these.

John