Environmental Science 1021F/G Study Guide - Final Guide: Pyrethrum, Rotenone, Rodenticide
24 Mar 2016
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Pest: entirely subjective, unwanted organism that interferes with human activities. Pesticide kill or control pests until they do not interfere with yield production. If we wipe out prey, predator population will drop. If we wipe out predator, prey population will rise. All species rely on one other, could disrupt entire food chain. Not all pests are attracted to the same crops. Not providing pests with buffet, prevent population build up. Plant outside the life cycle of the pest. Act as a natural barrier for weed seeds. Poisonous and stay in soil for a long time. Nicotine sulphate from tobacco-->plant plants or spread leaves. Second generation pesticides 1940s, before and after ww2. Paul mueller won a noble prize for creating ddt! Narrow spectrum-> just a few species or one category. Reducing how long they remain in the soil. Things that will naturally break down in the soil. Ddt used to prevent spread of malaria -->kill vectors (mosquitos)
