Abstract: Pesticide compositions are disclosed which contain D-limonene as an insect-killing ingredient along with surfactants or emulsifiers and water. The pesticide compositions are liquids designed for use as a flexible-purpose pesticide concentrate; a dip to rid small animals of fleas and ticks; a spray to kill fleas and ticks on small animals and in the kennels of small animals; a spray to kill flies on small animals and in the kennels of small animals; and a spray or liquid to rid household areas of cockroaches and other insect pests. The composition is non-toxic, non-polluting, biodegradable, non-irritating to animals other than insect pests.