BY4 - Population
- Created by: beth-marie2511
- Created on: 11-06-16 19:28
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- Population
- Pest Control
- Pests attack animals and crop plants which causes reduction in yield and a massive economic loss for farmers
- How pests cause damage
- Feeding on crops and animals
- Competing with crop organisms for resources
- Directly cause disease in crop organisms
- Economic Injury Level
- When pests cause so much damage it becomes worthwhile to invest in pest control
- Chemical Control
- Involves the use of herbicides, fungicides and insecticides to kill pests
- Pesticides are poisonous.
- Can be sprayed, used as powder or smokes in enclosed areas or added to animal feed
- Insecticides are used to kill insects
- They need to be specific, non-persistent and should not accumulate and be passed along food chains (bio-accumulation)
- Advantages
- Rapid eradication of pest over a specified localised area
- Cheap
- Fast acting and easy to apply
- Disadvantages
- Pests can develop resistance
- Toxic to non-target organisms
- Insecticides are non-specific
- Biological Control
- Exploitation of predator-prey relationships
- A beneficial organism (AGENT) is deployed against an undesirable organism (TARGET).
- Keeps pests below economic damage level
- Aim: To reduce pest population to a more tolerable level by artificially increasing the populations or the 'agent' organism
- Completely eradicating the pest would be counter-productive because the predator would have no food source and would die out
- And if the pest were to re-invade later on they would quickly increase to an economically damaging level
- Advantages
- Natural control method
- Very specific
- Cost effective if used long term
- Disadvantages
- Ultimately, you cannot control the predator you let loose into the pests environment
- Slow process
- Expensive to start up
- Pest Control
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