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University of Toronto Scarborough
Environmental Science
Carl Mitchell

Chapter 21: Pesticides Introduction Pesticides: A substance used to poison pests. o Commonly used to protect crop plants, livestock, domestic animals, and humans from damage and diseases caused by microorganisms, fungi, insects, rodents, and other pests, to defend crops from competition with unwanted but abundant plants (i.e., weeds) Humans have acquired important benefits from many uses of pesticides, including: o Increased yields of crops, because of protection from diseases, competition, defoliation, and parasites o Prevention of much spoilage and destruction of stored food o Prevention of certain diseases, thereby conserving health and saving the lives of millions of people and domestic animals Non-target organism (or non-target damage): Damage caused by a pesticide to non- target organisms. Organisms that are not pests, but which may be affected by a pesticide treatment. Broad-spectrum pesticide: A pesticide that is toxic to other organisms as well as the pest. The Nature of Pesticides o They are defined by their usefulness in causing more mortality to or otherwise managing the abundance of species that are deemed to be pests. [pests = any organism judged to be significantly interfering with some human purpose] o They are an extremely diverse group of chemicals. Their classification is based of pesticides is based on their targets: Fungicide: A pesticide used to protect crop plants and animals from fungi that cause diseases or other damages. www.notesolution.com
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