Impact Of Host Plant Xylem Fluid On Xylella Fastidiosa Multiplication ...

Table 1. Mean a developmental duration and size of three biometric parameters of immature stages of GWSS reared on
excised cowpea leaves.
Instar Immature duration ± SE (days) Biometric parameter ± SE (mm)
N Female Male N HCW BDL HTL
1 90 10.8 ± 0.9 a BC 10.1 ± 0.9 a BC 76 0.63 ± 0.004 g 2.30 ± 0.03 f 0.86 ± 0.01 g
2 76 6.1 ± 0.5 a C 5.8 ± 0.8 a C 21 0.82 ± 0.015 f 2.98 ± 0.0.09 f 1.19 ± 0.02 f
3 57 8.2 ± 0.9 a BC 8.9 ± 1.2 a BC 27 1.33 ± 0.034 e 5.61 ± 0.24 e 2.03 ± 0.08 e
4 40 12.1 ± 0.7 a B 12.9 ± 0.9a AB 27 1.87 ± 0.013 d 8.63 ± 0.14 d 3.01 ± 0.04 d
5 32 23.7 ± 2.5 a A 14.6 ± 1.8 b A 40 2.13 ± 0.031 c 9.58 ± 0.15 cd 3.19 ± 0.04 d
Total 32 60.9 ± 2.9 a 53.0 ± 1.5b - - - -
a Means followed by the same small case letter within each row and by the same capital letter within each column are not
significantly different (P > 0.05), Ryan-Einot-Gabriel-Welsch multiple range test (REGWQ). N, represents the sample size.
Table 2. Fecundity and life table parameters of GWSS reared on excised cowpea leaves.
Parameter n Fecundity* r m R o G DT λ
Mean 15 193.7 0.044 33.6 79.3 15.6 1.045
95% LCI 154.2 0.040 22.38 74.7 14.1 1.041
95% UCI
233.2 0.049 44.75 83.8 17.0 1.050
* Mean fecundity of gravid females only, i.e., 13 females; n, number of pairs included in analysis; r m , jackknife estimate of
the intrinsic rate of increase; R o , net reproductive rate; G, mean generation time (in days); DT, population doubling time (in
days); and λ, finite rate of increase; LCI = lower confidence limits and UCI = upper confidence limit
30 Instar 1
0.48-0.66
25
Number of individuals
20
15
10
Instar 2
0.75-0.90
Instar 3
1.01-1.50
Instar 4
1.70-1.94
Instar 5
1.98-2.20
Adult
2.30-3.02
0.56
0.76
0.96
1.16
1.36
1.56
1.76
1.96
2.16
2.36
2.56
2.76
2.96
3.16
5
0
Head capsule width (mm)
Figure 2. Distribution of head capsule widths of GWSS nymphs and adults.
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