BIOLOGICAL CONTROL The successful management of a pest by means of another living organism (parasitoids, predators and pathogens) that is encouraged and disseminated by man is called biological control. In such programme the natural enemies are introduced, encouraged, multiplied by artificial means and disseminated by man with his own efforts instead of leaving it to nature. The term biological control was first used by Smith in 1919 to signify the use of natural enemies to control insect pests. Natural Control: The maintainance of population numbers within certain upper and lower limits by the action of a combination of abiotic and biotic factors as well as the characteristic of the species under consideration is called natural control. History and development of biological control and classical examples of biological control First use of insect predators was in 900AD, when Chinese citrus growers used red ant ( Oecophylla smaragdina ) on the citrus trees to contro...