biology-biological control

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what is biological control?
the use of living organisms to control the population of a pest species.It is an alternative to chemical control,which is the use of chemical pesticides to kill pests.
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what are the biological control agents in biological control?
usually predators,parasites or micro-organisms that cause death by disease. ladybirds are form of BC in garden+eat greenfly,which feed on plants
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why are biological control agents introduced into the habitat?
to reduce a pest problem,and so it is always a species that is not already present in the environment,from a different country.-alien species
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state the advantages of biological control
no chemicals used that may persist in ground or on crop+so enter human food chain.If carefully selected,a BCA-attack just pest species.Many chemical pesticides affect other species also.eg some insecticides kill wide range of insects)BC-reduces pes
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state the disadvantages of biological control
more complicated to operate than chemical c.Difficult to use outdoors so mostly restricted to greenhouse crops.Containing agent is difficult.More expensive then c c bc of complicated nature.BCA may cause other prob in ecosystem.
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name some problems with alien species
some introduced into country where they don't naturally occur-may be done deliberately or by accident.Country were introduced may have no natural predators so new species could come invasive.invasive s-grow in numbers faster+upset ecosystem.NS-may no
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how has biological control changed?
methods have become more sophisticated.Many of problems happened in early stages+detailed research mean much more known about control agents now.-so reduced problems.
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what are the biological control agents in biological control?

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usually predators,parasites or micro-organisms that cause death by disease. ladybirds are form of BC in garden+eat greenfly,which feed on plants

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why are biological control agents introduced into the habitat?

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state the advantages of biological control

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state the disadvantages of biological control

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