Screening
bacterial
wilt
resistant
tomatoes
for
shade
tolerance
griculture,
Vellayani,
ruvananthapuram,
Kerala,
India
.
The
cu
erennial
plantation
crops
leaving
very
little
pace
for
vegetables
.
Identification
of
shade
tolerant
genotypes
deserve
priority
to
utilize
the
ny,
2002)
.
Bacter
cultivation
in
erala
accounting
for
even
100
per
cent
crop
loss
(Bose
and
Rajan,
2000)
.
The
present
resistant
backg
using
10
bacter
s
(0%,
25%
and
50%)
.
ack
high
density
polyethylene
net
fabricated
for
25
and
50%
shade
was
used
for
the
study
.
The
net
was
spread
at
a
height
of
2
.
5
m
from
ground
level
and
supported
on
GI
pipes
.
The
presence
of
bacterial
wilt
was
confirmed
by
planting
a
susceptible
line
Fla
7156
as
check
.
A
perusal
of
the
results
clearly
indicated
significant
variation
among
genotypes
and
shade
levels
for
yield
per
plant
.
LE
45
recorded
maximum
yield
under
all
shade
levels
with
1523
.
5
g,
1670
.
37
g
and
643
.
68
g
respectively
in
open,
25%
and
50%
shade
(Table
1)
.
Similar
results
were
reported
in
tomato
under
15%
shade
by
Smith
et
al
.
(1984)
.
There
was
significant
variation
in
number
of
fruits
per
plant
also
among
genotypes
and
shade
levels
.
It
is
observed
that
mild
shade
of
25%
did
not
affect
the
fruits
per
plant
while
50%
shade
reduced
it
considerably
in
the
present
study
which
agrees
with
the
findings
of
Yamashiti
and
Hayashi
(1994)
.
The
highest
fruit
set
of
the
top
yielder
LE
45
under
all
shade
levels
shows
its
ability
to
perform
well
under
the
stress
of
shade
.
The
genotypes
were
scored
under
all
shade
levels
for
the
incidence
of
important
pests
and
diseases
on
a
0
–
5
scale
depending
on
the
severity
of
infection
.
The
low
incidence
of
spotted
wilt
virus
(TSWV)
observed
under
shade
may
be
due
to
the
reduced
activity
of
thrips,
the
vector
for
the
virus
transmission
.
Among
the
genotypes,
LE
34
recorded
the
least
incidence
whereas
the
maximum
incidence
was
in
LE
1
.
Similarly,
the
fruit
borer
(
Helicoverpa
armigera
)
and
serpentine
leaf
miner
(
Liriomyza
trifolii
)
incidence
was
also
significantly
low
under
shade
.
The
genotype
least
affected
by
leaf
miner
was
LE
2
and
fruit
borer
was
LE
42
.
The
study
confirmed
the
bacterial
wilt
tolerance
in
all
the
breeding
lines
selected
even
under
shade
whereas
the
susceptible
check
Fla
7156
completely
succumbed
to
the
disease
irrespective
of
the
shade
level
.
Though
none
of
the
genotypes
was
found
completely
resistant
to
pests
and
diseases,
the
incidence
was
comparatively
low
under
shade
suggesting
the
scope
for
production
of
healthy
plants
by
providing
mild
shade
of
25%
.
Moreover,
the
tomato
yield
under
25%
shade
was
on
par
with
the
yield
in
open
.
Hence
in
Kerala,
where
the
majority
of
the
land
is
occupied
by
perennials
especially
coconut,
the
interspaces
with
approximately
25%
shade
can
be
effectively
utilized
for
growing
tomato
.
Smitha,
K
.
,
Celine
,
V
.
A
.
,
Sreelathakumary,
I
.
and
Rajamony,
L
.
Department
of
Olericulture,
Kerala
Agricultural
University,
College
of
A
Thi
ltivable
area
in
Kerala
is
dominated
by
p
s
available
interspaces,
especially
of
coconut
(Sreelathakumary
and
Rajamo
ial
wilt
caused
by
Ralstonia
solanacearum
is
another
handicap
in
tomato
K
study
was
conducted
to
identify
shade
tolerant
genotypes
in
a
bacterial
wilt
round
.
The
experiment
was
laid
out
at
College
of
Agriculture,
Vellayani
ial
wilt
resistant
tomato
genotypes
under
different
shade
level
Bl
No navigation control above? Click here!