The human environmental system includes pests and diseases. There is a harmony in this system between the predators and pests. This is the manner of regulating populations by nature. The species we call pests and the disease-causing organisms only become' pests and diseases' as their actions tend to destroy crops and affect yields. If the natural structure of the ecosystem is imbalanced, one population may become dominant since it is not being preyed upon.
Natural control is aimed at maintaining a balance between plant and predator and holding pests and diseases to an acceptable level. The goal is not solely to eliminate them, as they also have a role to play in the natural system. Once a virus or disease starts destroying a crop, the damage cannot be reversed and monitoring is becoming increasingly difficult. Next, use proper techniques to avoid or prevent attacks by pests and diseases where appropriate.