International Journal of Horticulture 2015, Vol.5, No.4, 1
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Table 6 Feeding dynamics of adults of
P. quatuordecimpunctata
on
S. dulcis
and
S. pinnata
leaves
Adult
S. dulcis
S. pinnata
F
(
df
=1,4)
P
GR (mg/day)
0.24±0.01
0.25±0.01
16.111
0.016
CR (mg/day)
3.96±0.01
4.22±0.01
24.044
0.008
RGR (mg/day)
4.75±0.01
5.08±0.01
53.099
0.002
CI (mg/day)
77.40±1.00
86.77±1.10
37.316
0.004
ER (mg/day)
44.36±0.20
46.12±0.10
47.646
0.002
HCR (mg/day)
121.80±1.20
132.90±1.30
39.713
0.003
AD (%)
42.67±0.50
46.83±0.60
31.531
0.005
ECI (%)
6.14±0.01
5.85±0.10
15.386
0.017
ECD (%)
14.39±0.20
12.50±0.30
26.429
0.007
HUE (%)
63.56±0.20
65.29±0.20
31.026
0.005
Note: Mean ±SE of 3 observations with
F
and
P
values are representing different significant level (ANOVA), while comparing one
type of host plant as food with the other
1.3 Population dynamics
The population dynamics of
P. quatuordecimpunctata
was calculated on their two host plant leaves,
S. dulcis
and
S. pinnata
, separately and showed different
pattern with highly significant differences in different
population parameters.
The three cohorts containing 146,142,134 eggs for
S.
dulcis
and 160, 156, 154 eggs for
S. Pinnata
were
reared separately to construct the demographic data of
P. quatuordecimpunctata
and they represent similar
pattern of development with significant variations (p<
0.05). The proportion of surviving (lx) and the
survivorship (sx) of
P. quatuordecimpunctata
on the
two host plants gradually decrease throughout the
developmental stages (Table 7 and 8). The average
population alive in each stage (Lx) was also gradually
decreased in the development of egg to adult stage
(Table 7 and 8) and always significantly higher on
S.
Pinnata
than
S. dulcis
leaves throughout the
developmental stages (
F
1,4
> 12.482,
P
<0.02). Life
expectancy (ex) followed the same pattern of lx for
each host plants (Table 7 and 8) and always
significantly higher on
S. Pinnata
relative to
S. dulcis
(
F
1,4
> 9.730,
P
<0.05). The killing power (Kx) was
always higher in the early stages than the advanced
stages for both host plants (Table 7 and 8) and higher
on
S. Pinnata
relative to
S. dulcis
leaves throughout
the developmental stages.
Table 7 Stage-specific pooled life table of
P. quatuordecimpunctata
on
S. dulcis
leaves
S. dulsis
lx
dx
qx
sx
Lx
Tx
ex
kx
Egg-0
0.963±0.024 0.367±0.008 0.381±0.008 0.618±0.008 0.779±0.022 4.374±0.160 4.539±0.107 0.208±0.005
lnst- I -1 0.595±0.020 0.059±0.002 0.1±0.006
0.9±0.006
0.566±0.021 3.731±0.149 6.261±0.106 0.045±0.003
lnst- II-2 0.536±0.021 0.052±0.006 0.097±0.008 0.902±0.008 0.510±0.019 3.165±0.130 5.901±0.098 0.044±0.003
lnst- III-3 0.484±0.016 0.063±0.009 0.131±0.017 0.868±0.017 0.452±0.015 2.655±0.112 5.483±0.080 0.061±0.008
lnst- IV-4 0.420±0.016 0.047±0.003 0.113±0.006 0.886±0.006 0.396±0.015 2.203±0.097 5.242±0.056 0.052±0.003
Prepup-5 0.372±0.013 0.043±0.002 0.117±0.010 0.882±0.010 0.350±0.014 1.062±0.054 2.852±0.041 0.054±0.005
Pup-6
0.328±0.015 0.054±0
0.167±0.008 0.832±0.008 0.301±0.015 0.712±0.039 2.165±0.016 0.079±0.004
Adult-7
0.274±0.015 0±0
0±0
1±0
0.273±0.015 0.410±0.023 1.5±0
0±0
Table 8 Stage-specific pooled life table of
P. quatuordecimpunctata
on
S. pinnata
leaves
S. pinnata
lx
dx
qx
sx
Lx
Tx
ex
kx
Egg-0
1.073±0.012 0.390±0.003 0.363±0.007 0.636±0.007 0.877±0.013 5.520±0.224 5.142±0.160 0.196±0.004
lnst- I -1
0.682±0.014 0.052±0.002 0.076±0.002 0.923±0.002 0.656±0.014 4.852±0.224 7.102±0.190 0.034±0.001
lnst- II-2
0.630±0.013 0.052±0.006 0.083±0.011 0.916±0.011 0.603±0.016 4.196±0.210 6.651±0.195 0.038±0.005
lnst- III-3
0.577±0.019 0.050±0.006 0.087±0.012 0.912±0.012 0.552±0.022 3.592±0.194 6.211±0.134 0.039±0.006
lnst- IV-4
0.527±0.024 0.034±0.003 0.065±0.010 0.934±0.010 0.510±0.026 3.039±0.172 5.758±0.059 0.029±0.004
Prepup-5
0.493±0.028 0.036±0.002 0.074±0.001 0.925±0.001 0.474±0.027 1.543±0.088 3.129±0.006 0.033±0.001
Pup-6
0.456±0.026 0.036±0.002 0.079±0.001 0.920±0.001 0.438±0.025 1.068±0.061 2.340±0.003 0.036±0.001
Adult-7
0.420±0.024 0±0
0±0
1±0
0.420±0.024 0.630±0.036 1.5±0
0±0
