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The advantages and disadvantages of the biological control method of pest management?

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  • Essay length: 651 words
  • Submitted: 29/03/2005
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AS and A Level Energy, Respiration & the Environment

The first 200 words of this essay...

Andrew Wilson

The advantages and disadvantages of the biological control method of pest management

The biological control method of pest management does not use chemicals. Biological control uses various organisms that are either predators or parasites to the pest. A pest is an organism which causes damage to people and their crops, however this is an economical definition, as opposed to a biological one. Something is considered to be a pest when it reduces productivity by 5-10%.

Plants require certain mineral ions in order to grow well, however there is a limited amount of these in soil. Therefore if weeds are growing in a wheat crop, they will take some of the mineral ions that would go to the wheat plants. Interspecific competition is the competition between organisms of different species for the resources that they require, and intraspecific competition is the competition between organisms of the same species. Weeds also compete with crops for water and light as opposed to just mineral ions.

Pests reduce the yield of plants in various ways. They can have a direct effect by damaging the leaves of the plant. Aphids feed by inserting their mouthparts into plant cells,

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