Environmental Science 3300F/G Midterm: Midterm 1 Lecture Objectives Pesticides Part 1
22 Mar 2018
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Three insect borne diseases: malaria, dengue fever, west nile virus. Three disadvantages of pesticides: we might not really know what a safe level is for all chemicals, pesticide residues in foods (cid:449)e do(cid:374)"t k(cid:374)o(cid:449) if it is safe. Three pesticides used before the introduction of modern synthetic pesticides: boric acid to control cockroaches, so2 by incorporating s in candles, oils derived from fish or petroleum. The alternatives to the use of insecticides: practices that are detrimental to specific species, eliminate breeding site, grow resistant species, restrict habitat, biological control introduce predators. Because of this they enter living organisms: the whole planet is contaminated by low levels because they are persistent and hydrophobic, e. g. Ddt declined a lot because use has stopped but still used for malaria treatment: e. g. Ddt substitute = methoxychlor (a water soluble form: organophosphates: nerve agents acting on enzyme acetylcholinerase.
