Increased productivity agricultural chemicals food

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Increased productivity !!!
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Agricultural chemicals & food production Phases of the agricultural revolution Phases of the agricultural revolution The new system of intensive farming  The new system of intensive farming  and monoculture and monoculture Facilitated the development of pests Facilitated the development of pests
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Agricultural chemicals & food production Phases of the agricultural revolution Phases of the agricultural revolution Phase 3 (second chemical phase):  Phase 3 (second chemical phase):  Development of chemical  Development of chemical  pesticides pesticides
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Agricultural chemicals & food production Pesticides Pesticides General term referring to a chemical,  General term referring to a chemical,  physical, or biological agent that kills  physical, or biological agent that kills  organisms that we classify as pests,  organisms that we classify as pests,  such as insects, rodents and fungi such as insects, rodents and fungi The term includes The term includes     fungicides, insecticides, herbicides fungicides, insecticides, herbicides     and other agents effective against  and other agents effective against  disease-causing organisms, such as bacteria disease-causing organisms, such as bacteria
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Agricultural chemicals & food production Why use pesticides? Why use pesticides? Each year, pests consume or destroy  Each year, pests consume or destroy  30-48% of world's food production 30-48% of world's food production despite pest control efforts  despite pest control efforts  (costs in the US about $4.1 billion/year (costs in the US about $4.1 billion/year ) )
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Pesticides: historical perspective Pesticides: historical perspective The " The " first generation first generation " pesticides were " pesticides were highly toxic compounds,  highly toxic compounds,  such as  such as  arsenic and hydrogen cyanide arsenic and hydrogen cyanide Their use was largely abandoned because  Their use was largely abandoned because  they were either too ineffective or too toxic they were either too ineffective or too toxic Agricultural chemicals & food production
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The " The " second generation second generation " pesticides " pesticides included  included  synthetic organic compounds synthetic organic compounds Agricultural chemicals & food production Pesticides: historical perspective Pesticides: historical perspective DDT ( d ichloro d iphenyl t richloroethane ) The miracle of 1939  Broad spectrum  Persistent (POPs)  Insoluble 
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Agricultural chemicals & food production DDT in Canada DDT in Canada Although DDT was never manufactured in  Although DDT was never manufactured in 
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