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Parasites that invade and live within the host are referred to as endoparasites; meanwhile, those that live on the surface without invading the host are referred to as ectoparasites.
As early as the third century, a nest of the ants Oecophylla smaragdina were sold near Canton (today known as Guangzhou in China) for use in control of the citrus insect pests such as Tesseratoma papillosa (Lepidoptera). D., the usefulness of the ladybird beetles as biological control agents of aphids and scales had been recognized. D., the importance of biological control tools was recognized.
This is termed biological control or simply biocontrol.
Biocontrol is therefore defined as “any activity of one species that reduces the adverse effect of another” .
Biocontrol is defined as “the study and uses of parasites, predators and pathogens for the regulation of host (pest) densities”.
Considerable successes have been achieved in the implementation of biocontrol strategies in the past.These factors are responsible for the “checks and balances” of a population of living organisms.