Insecticides are substances toxic chemicals used to kill insects. Insecticides can affect the growth, development, behavior, breeding, health, hormonal system, digestive system, as well as other biological activity to lead to the death of the insect nuisance plants Insecticides including one type of pesticide.
Historical use of insecticides
The plantation workers are known to have used soap to control the growth of insect pests since the early 1800s. At the beginning of the 19th abag, soap made from the most widely used fish oil. These methods are effective, although they had given many times and sometimes even deadly plants.  The earliest known also by the use of a mixture of garlic, onion, and pepper or a variety of other foods, but not enough to effectively kill insects.
The use of synthetic insecticides first started in the 1930s and began to spread after the end of World War II. In 1945 to 1965, the group organochlorine insecticide widely used for both agriculture and forestry. One of the most famous product is the insecticide DDT commercialized since 1946. Furthermore, emerging class of synthetic insecticides such as organophosphates, carbamates, and pirethroid in the 1970s. since 1995, transgenic plants carrying the gene for insect resistance into use.