(1) Controlling insects, fungi, nematodes, rodents, and other pests which ravage and destroy our supply of food and fiber, which serve as vectors of disease, and which otherwise constitute a nuisance in the environment or the home;
(2) Controlling weeds which compete in the production of food and fiber and which otherwise are unwanted elements in our environment; and
(3) Regulating plant growth to enhance both the quantity and quality of our supply of food and fiber and to facilitate its harvest.