I do not use insecticide any longer. If I have an insect pest problem I use a combination of Dr. Bronners Peppermint soap and a few essential oils. With this mix I have rid myself of a major ant infestation and kept hornets from building nests under the eaves. Right now we are in the middle of a catastrophic bee die-off and there is evidence it is chemicals that are the culprit. Here is a link to a good article on the subject.
For the recipe to get rid of ants follow this link to "The Invisible Gardener" and look for his "Dances with Ants" instructions. Andy is a sheer genius when it comes to pest control and organic gardening. There is a small fee to join his site for a lifetime but well worth it. Look for his Internet only specials.