This is referred to as natural control. Natural enemies of insect pests, also known as biological control agents, include predators, parasitoids, and pathogens. Parasitoids are species whose immature stage develops on or within a single insect host, ultimately killing the host. Many species of wasps and several flies are parasitoids, e.g. Augmentation involves the supplemental release of natural enemies.
Entomology is the study of insects and related animals.
Applied entomology uses the knowledge gained through basic research to solve problems in agriculture, medicine, health, criminology, ecology, forestry, and more. Agricultural crops, turf, ornamental plants, and trees are all attacked and injured by insects, and many entomologists are engaged in activities to minimize this destruction. As one recent development in the lab, molecular monitoring techniques used in ecological research and agro-practice are being studied. T.chilonis and T.ostriniae are being applied on farms in China. Biological control as a major factor towards IPM relies much on parasitoids, and Trichogramma is the most important parasitic wasp for practical use.