Definition of powdery mildew
a
fungal
disease
of
plants
caused
by
an
ascomycete
of
the
order
Erysiphales
,
characterized
by
a
powdery
white
film
on
the
surface
of
the
affected
plants
.
It
is
damaging
to
,
e
.
g
.,
roses
and
lilacs
.
Also
,
a
fungus
that
causes
such
a
disease
.
See also:
Mildew
Related Words
Erysiphe
,
genus
Erysiphe
,
mildew
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