Pesticides: These are synthetic toxic chemical substances which are
used in agriculture to control the damages done by insects, rodents, weeds and
various crop diseases. The repeated use produces resistance in the pests and
thus new substances are to be discovered in due course of time. DDT, BHC,
aldrin and dieldrin have been tried as insecticides. Now-a-days, organophosphates
and carbamates have been in use as insecticides.
Herbicides: These are
the chemicals used to control weeds. Previously, sodium chlorate and sodium arsenite
were used but these are not preferred these days on account of their toxic
nature to mammals. Now-a-days, organic compounds such as triazines are considered
as better herbicides.
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