An insect bait specifically formulated for the biology, feeding behavior and food preferences of carpenter ants preferably includes the following ingredients: sucrose and/or fructose sugars; alkali or alkaline earth salts such as sodium chloride, potassium chloride, magnesium chloride, and calcium chloride; urea; and amino acids and/or proteins. Ideally, the bait has a matrix material that has a gelatinous consistency, and, most preferably, the matrix material is agar. Fats and oils are not preferred by carpenter ants; therefore, the use of these materials in the insect bait should be minimized or eliminated. By combining an insecticide with the bait, the material is used to effectively control and eliminate carpenter ant infestations.