example of biological control - not using pesticide:
- In Australia, the prickly pear cactus, which was the pest, of north america was introduced to gardens
- it escaped into the countryside
- it flourished under the Australian climate and the ecosystem
- the cactus started to cover a deal of agricultural land and was necessary to get rid of it
- there was no natural herbivore of the cactus and was necessary to introduce an alien species from another country = a moth which feeds on the cactus, known as Cactoblastis
- the moth was introduced and had no competitors = able to eat away at the cactus and remove it from the agricultural land of Australia
Pros:
- There are no toxic chemicals involved
- this leads to less impact on man/wildlife
Cons:
- not 100 percent effective
- often difficult to control - there is always a danger that the introduced species will find alternative pray on which to feed and will not die out once the pest has been removed
- difficult to match a predator to the prey
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