Cryolite is used as an insecticide and a pesticide. These same problems occur in agriculture with pesticide and herbicide resistance. It produces agricultural chemicals including the pesticide Lorsban and consumer products including Styrofoam. Parathion is used as an agricultural pesticide. These confer resistance to insect pests and thus reduce the necessity for pesticide use. Both cautions are due to PCB and pesticide contamination. The first pesticide used for indoor residual spraying was DDT. Most of this chemical run-off consists of agriculture pesticide and fertilizer. AlP is used as both a fumigant and an oral pesticide. Pests can develop a resistance to the pesticide (pesticide resistance), necessitating a new pesticide. I is rotenone (commonly used as an organic pesticide). There are three types of pesticide poisoning. Hydrogen cyanide has been absorbed into a carrier for use as a pesticide. Registered by the EPA as a pesticide (EPA Reg. It is used as a rodenticide and other animal pesticide.