Chemicals and other
substances used to control pests are termed as
pesticides. They protect crops against pests
but in the process affect man and livestock.
Today, more than a thousand pesticides are
being used throughout by farmers, gardeners,
foresters and in homes, industries, go- downs
Basically, these pesticides
are used to protect plants against pests and
diseases and to treat seeds and though they
are useful to mankind, they have led to a
great extent of environmental problems.