From the beginning of life human has been constantly competing with the pest for food and shelter. Food production and disease control are the most important challenges faced by human that deserved special attention. The reduced yield and harvest lost are due to pest, by transmitting the diseases, they are threatening human and live stock . Due to this reason many research efforts are considered for controlling the pest and insect by using pesticides. Pesticides are used for destroying, repelling or mitigating any pest not to affect human health. These are grouped under the basis of target organisms, chemical structure, physical state, biological mechanism; but the most popular and preferable classification is based on the target organisms, means on which type of pest, pesticides are being used.eg - Algaecide for Algae, Avicide for Birds, Bactericide for Bacteria, Fungicide for Fungi, Insecticide for Insect, Nematicide for Nematodes, Rodenticide for Rodents, Virucide for Viruses etc. Pesticides should have some ideal properties such as-
- It should be effective against pest.
- Lower stability in the environment.
- High toxicity for pest and low toxicity for plant, human and other warm blooded animals.
- It should be affordable.
- It should be non cumulative (no bio-magnification).
- It should have acute and chronic effect.