Energy and Ecosystems
- Created by: Cordelia Roberts
- Created on: 28-11-12 14:13
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- chemical and biological control of agricultral pests
- pests
- organism that competes with humans for food or space.
- reduce productivity
- weeds competition forwater minerals
- insects damage crops eating them.
- pesticides
- biodegradable so it will break down into harmless substances in the soil but needs to be chemically stable so has a long shelf life
- cost effective
- be specific harmless to humans and other organsims
- not accumulate - causing bioaccumulation
- biological control
- aim to control not eradicate
- could be counter productive so not enough pest for predator, pest numbers increase.
- controlling a pest by using its natural predator or parasites of it
- disadvantages
- control may become pest itself
- do not act as quickly time between introduction and significant control
- aim to control not eradicate
- comparison of biological and chemical control
- biological
- pests don't become resistant
- very specific
- control organism reproduces itself
- control could become pest feed on crops due to low pest population
- chemical pesticides
- pests can develop genetic resistance
- new pesticides have to be developed
- must be re-applied - expensive
- risk of bioaccumulation and eutrophication
- always have some effect on other species
- pests can develop genetic resistance
- biological
- integrated pest control systems
- minimum impact on environment
- involves
- manually remove pests
- monitor crops for early pests.
- use biological control if necessary
- manage environment to provide habitats for preadators
- last resort: pesticides
- use immune plant/ animal to a pest
- chemical biological and natural methods
- pests
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