Pests are unwanted plants, animals, insects, germs or other organisms that interfere with human activity. They may bite, destroy food crops, damage property, or otherwise make our lives more difficult. Effective pest control requires some knowledge about the pest and its habits. The first step is to identify the pest correctly; the second step is to learn about its lifestyle. After that, you can evaluate strategies to control your pest.
Many pests have only become a problem as a result of the direct actions by humans. Modifying these actions can often substantially reduce the pest problem.
Living organisms evolve and increase their resistance to biological, chemical, physical or any other form of control. Unless the target population is completely exterminated or is rendered incapable of reproduction, the surviving population will inevitably acquire a tolerance of whatever treatments fail to exterminate them.