Abstract:
Organophosphorus insecticide is a synthetic farm
chemical which has been continuously developed since
1937 when Bayer of Germany first developed it.
This insecticide has outstanding properties and performance;
strong power of killing harmful insects, a
wide variety of applications, contact, stomach and gas
poisoning effect, and excellent permeability and
osmosis. It thus has an unparalleled effect against
insects harmful to rice, fruits and other agricultural
crops which insects can hardly be destroyed by other
insecticides, thereby contributing greatly to farm production
increases.
EPN is a variety of organophosphorus insecticide
first developed in the United States in 1949. It is the
most widely used agricultural chemical, only next to
parathion, in the world today. Its direct insect killing
effect is somewhat weaker than parathion, but its
remaining effect is longer because of its relative stability
against hydrolysis. Thus its actual killing effect
on insects is almost similar to that of parathion,
though its osmosis in a plant is relatively weak.