Many chemical substances are used as pesticides. After world war II, Cyanide and nicotine were extensively used to control the pests. Now a days, the compounds containing chlorine and phosphorous are used as pesticides.
Some compounds are listed below:
Organophoshporous compounds Organochlorine compounds
Malathion DDT (Dichlorodiphenyl Trichloroethane)
Parathion BHC (Benzene Hexa Chloride)
Methyl parathion Dieldrin
Effects of pesticides
Agricultural production has been strangely increased due to the use of insecticides and pesticides. May be, this is one of the reason that the food grains for the overgrowing population has been fulfilled.
DDT is one of the extensively used pesticides. But due to the excessive use of the organochlorine compounds abnormalities are caused.
Due to the use of DDT birds lay less number of eggs and the outer shell of eggs are thin. This has affected in fishery also. Human beings when exposed to an environment of DDT for long time may suffer from cancer. DDT has advantages over disadvantages and due to the reason that it is readily available and cheap, it has been used largely and mostly.