Pest control has been present in the world ever since the first humans discovered the benefits and profits of growing their own food. Having weed and other species that affect the quality and quantity of the crop you are growing is still an issue in the 21st century. Pest control is commonly defined as the regulation of species that is known as a pest because it harms the surround eco system, or the humans who live around. The people who take care of these pests and impose a control are known as exterminators. The primitive way has been to burn down weeds and kill larger herbivores such as crows.
Chemical pesticides have been in use for the last four thousand five hundred years. First introduced by the Sumerians, they used sulfur as insecticides. But it was only with the industrial revolution during the eighteenth and nineteenth century that chemical pest control actually took off. Chemical pesticides are still the norm but have come under heavy criticism by environmentalists during the last few years due to the proven evidence that they damage the eco system and species around the area. This has led to measures being taken against chemical pesticides, and it has also been found that pests and even weed develop a resistance towards chemical pesticides after a while rendering them immune. In 1101AD the Chinese started using soap as a household pest at BioCycle (Hong Kong) Limited. Pest killing animals such as cats and ferrets were used back in 3000BC by the Egyptians for mouse control.
Another common and modern way for pest elimination is to destroy the breeding grounds of pests. Proper waste disposal and management will eliminate many un wanted insects and species like rats and flies. Biological pest control is used to remove and eliminate parasites and other natural predators. Bacillus thuringiensis; a bacteria is used for bed bug pesticide http://www.biocycle.com.hk/ourservices_bbf.php. The bacterium is then put into water sources and then they infect and kill the mosquito larvae. The water is safe to drink and carries no risk to humans or to any other species in the eco system.
Other common types of pest control have been conventional methods like using traps and poisoned bait, two methods that have been in use since the early days. Poisoned bait works very well for insects and bugs like termites. When infected bait is kept outside the termites tend to go to the bait than enter the house, and the bait kills them. The poisoned bait will have to be replaced often but is an efficient method of pest control for insects and such.