difficult
to
detect
later
on
.
At
harvest
stage
the
plants
of
922
and
957
were
fully
recovered,
i
.
e
.
symptomless
.
The
other
cultivars:
Anastasia,
Boloudo
and
932
-
Tovi
-
Can
were
symptomless
throughout
the
trial
.
ltivars,
the
infected
plants
had
smaller
fruits
and
lower
yield
compared
to
the
non
-
infected
controls,
regardless
of
the
presence
of
TYLCV
symptoms
in
the
leaves
(Figure
1)
.
There
seems
to
be
some
relation
between
the
level
of
tolerance
and
the
decrease
in
fruit
weight
(Figure
2)
.
In
the
symptomless
cultivars:
Fruit
size
decreased
by
6
-
10%
only,
while
in
the
less
tolerant
cultivars
916
and
922
the
fruit
size
decreased
by
36%
and
16%,
respectively
.
Fruit
size
of
the
susceptible
control
decreased
from
140
g
to
80
g
i
.
e
.
42%,
with
fruit
of
non
-
marketable
quality
.
Percent
yield
loss
is
given
in
Figure
3
.
In
the
highly
tolerant
–
symptomless
cultivars,
the
yield
loss
varies
from
17%
(932
-
Tovi
-
Can),
up
to
36%
(Boloudo)
.
The
yield
loss
of
the
medium
tolerant
cultivars
922
and
957
was
about
25%
and
that
of
the
susceptible
control
144
(Daniela)
reached
72%
.
Conclusions
ultivars,
in
terms
of
yield
and
fruit
2
.
Mild
symptoms
of
the
virus,
visible
during
early
growth,
are
not
an
indication
for
increased
loss
of
yield
when
compared
to
symptomless
tolerant
cultivars
.
Literature
cited
Cohen,
S
.
,
Antignus,
Y
.
1994
.
Tomato
yellow
leaf
curl
virus,
a
whitefly
-
borne
Geminivirus
of
tomatoes
.
Adv
.
Dis
.
Vector
Res
.
10:
259
-
288
In
all
the
tested
cu
1
.
Infection
of
TYLC
virus
causes
damage
to
tolerant
c
weight
.
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