None of us like the sight of insects and hence most of us do a pest control at home at regular intervals to keep the insects and pests away. In fact, we keep ourselves well-equipped against these insects. The moment we see a mosquito or cockroach creeping inside our house, we immediately grab a can of insecticide and spray on it. The insect instantly dies.
Pesticides and insecticides are a mixture of substances that help in destroying, preventing or controlling insects and pests. By spraying pesticides and insecticides, you not only keep the insects out of your house but also make sure that you have a disease free life.
It is said that humans started using pesticides and insecticides well before 2000 yearsago. The first form of pesticide was elemental sulphur dusting which was used in Sumer around 4,500 years ago. Around 15th century, toxic substances like arsenic, lead and mercury were used. By 17th century, nicotine sulphate was extracted from tobacco leaves and was used as insecticide. Around 19th century, two more natural substances like pyrethrum which is derived from chrysanthemums, and rotenone which is derived from the roots of tropical vegetables came into existence.
In 1950′s, Paul Muller discovered that dichlorodiphenyltrichloroethane or DDT, yet another chemical, was a better option and was more effective than the rest of the variants. DDT replaced all the other types by 1975. Since then, DDT and pyrethrin compounds have dominated the insecticide and pesticide industry. Besides this, herbicides also gained lot of popularity. Herbicides contained triazine and other nitrogen-based compounds.
How do they work?
Pesticides and insecticides contain tons of bug killing microns. In fact even after the sprayed medicine dries, the microns still exist and kill the bugs.
Bugs also have nervous system just like mammals. Their nervous system contains nerves that pass impulse to the brain and gets a sensory reply back. When the pesticides and insecticides are sprayed, impulses that are sent to the brain do not stop. The impulses are similar to those of hunger pangs. Due to excess impulses, the organs of the bugs break down and as a result the bug dies.
Now that you know what pesticides and insecticides are made of and how they work, it is important to read the instructions before using one.