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Natural Predators as Biological Controls

Scientific and Technical concepts

Advantages and Disadvantages
Scientific and Technical concepts
Current State of Research
Costs Of Using this Method
How and When the Costs may be brought down


There are Three Approaches to Biological Control :
Classical Biological Control:
~ this means introducing a new organism that wasn't originally part of the habitat
~ The new organism is a natural enemie to the unwanted pests
~The problem with this is that the organism introduced may not have any predators in the new home, therefor it may keep increasing its population rapidly
~ increasing the population of a natural enemy which is a natural enemie to the pest
~ this is done by producing the organism in a lab and releasing it
~ This means creating ideal conditions for a pests natural enemy so they can continue to eliminate the pest

The main forms of natural predators is as followed:


This wasp is laying its egg inside an aphid where its young will develop. Parasitoid immatures develop on or inside a host, killing it as they mature. They emerge as adults and continue the cycle.

DEFINITION ~ Any of various insects, such as the ichneumon fly, whose larvae are parasites that eventually kill their hosts.



Lady beetles are well-known examples of predatory insects. A predator consumes many prey during its lifetime. The predators listed in this guide feed on insects and mites.

DEFINITION ~An organism that lives by preying on other organisms



This nematode is just one example of a pathogen which may kill its host. Other pathogens include bacteria, viruses, fungi and protozoa. This section also includes antagonists which control plant diseases.

DEFINITION ~An agent that causes disease, especially a living microorganism such as a bacterium or fungus.



Weeds can be attacked by arthropods, vertebrates, and pathogens (fungi, viruses, bacteria, and nematodes). This weevil feeds only on one particular type of weed called purple loosestrife.

DEFINITION ~any organism who eats weeds

Natural Predators as Biological Controls