They
occur
from
temperate
to
tropical
regions
but
it
is
in
the
warmer
areas
that
serious
losses
occur
in
crops
as
coconuts,
Citrus,
rice,
maize,
cotton
an
Potatoes.
They
also
so
occur
in
insects
and
as
saprophytes
in
soil
and
sewage.
A
number
of
mycoplasma
diseases
of
plants
are
listed
by
Ghosh
and
Raychoudhuri
(1972).
During
1940s
there
occurred
unusual
increase
in
cases
of
human
pneumonia.
Monroe
Eaton
isolated
a
tiny
virus
like
agent
from
the
respiratory
tract
of
patients.
This
was
named
Mycoplasma
pneumoniae,
the
Eaton
agent.
The
disease
came
to
be
known
as
primary
atypical
pneumonia
(PAP).
Mycoplasma
hominis
causes
a
sexually
transmitted
disease,
mycoplasma
urethritis.
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