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The environmental issues associated with pest control Pests are living organism which is considered to have a detrimental effect on humans. Pesticides are normally used to combat these pest. Pesticide is a chemical compound often delivered in a spray, which kill pest or inhibits their growth. For example insecticide is a pesticide which kills flies. DDT has also been used to kill mosquitoes and lice; however this substance is now banned in Britain. Pest can be controlled by chemical pesticides. This is the use of toxic chemicals to kill pests. They can also be controlled by biological control; biological control is deliberately increasing the number of predators or parasites of the insect pest. Here are some examples of biological control (see fig 1.1). Fig 1.1 (from New Understanding Biology Book) Target (pesticide) Harmful effects of pest Control agent Method of action Scale insect (icerya) Kills citrus fruit trees Ladybird (rodolia) Ladybird uses scale insect as a food source Codling moth (crytophlebia) Ruins...

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