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Table 6 Population dynamics and reproductive table (Mean ± SE of 3 observations/cultivar) of the 9 cohorts (3 cohorts/cultivar; n = 100) of S. obliqua Walker on the selected sesame (S. indicum) cultivars (Rama, Shubhra and Amrit) cultivated during 2019

From: Population ecology and economic thresholds-based time series for climate smart pest management of Spilosoma obliqua Walker (Lepidoptera: Arctiidae) on three sesame cultivars

Population parameters

Rama

Shubhra

Amrit

F2,6

Sig

Potential fecundity (Pf)

320.667 ± 9.528

252.625 ± 8.521

168.542 ± 9.436

63.863

 < 0.001

Total fertility rate (Fx)

17,089.333 ± 1726.172

6608.267 ± 1208.027

1601.867 ± 728.188

37.710

 < 0.001

Gross reproductive rate (GRR) mx

96.237 ± 4.594

59.775 ± 5.917

59.394 ± 7.292

12.293

0.008

Net reproductive rate (NRR) R0

53.067 ± 3.811

25.867 ± 3.811

9.067 ± 3.811

33.944

 < 0.001

Generation time (Tc)

44.862 ± 0.071a

44.047 ± 0.480a

44.638 ± 0.147a

2.069

0.207

Doubling time (DT)

7.845 ± 0.135

9.501 ± 0.540

20.161 ± 0.587

12.316

0.007

Intrinsic rate of increase (rm)

0.088 ± 0.002

0.073 ± 0.004

0.044 ± 0.012

9.084

0.015

Euler's corrected r (rc)

0.030 ± 0.002

0.051 ± 0.005

0.104 ± 0.022

8.316

0.019

Finite rate of increase (λ)

1.092 ± 0.002

1.076 ± 0.004

1.045 ± 0.013

9.424

0.014

Weelkly multiplication rate (λ7)

1.857 ± 0.020

1.673 ± 0.047

1.367 ± 0.115

11.727

0.008

Annual rate of increase (ARI) (λ365)

1.38E + 14

1.53E + 12

1.67E + 09

3.936

0.081

Increase rate per generation (λTc)

53.067 ± 3.811

25.867 ± 3.811

9.067 ± 3.811

33.944

 < 0.001

Generation mortality (GM)

0.385 ± 0.019

0.601 ± 0.049

0.982 ± 0.218

5.451

0.045

Mortality coefficient (MC)

0.165 ± 0.007

0.102 ± 0.011

0.052 ± 0.020

17.039

0.003

Generation survival (GS)

0.620 ± 0.013

0.500 ± 0.022

0.177 ± 0.060

37.168

 < 0.001

Population growth rate (PGR) (rmN)

11.758 ± 1.043

4.822 ± 0.944

1.217 ± 0.655

35.739

 < 0.001

Population momentum factor of increase (PMF)

16.434 ± 0.524

11.918 ± 0.845

22.920 ± 1.692

23.834

 < 0.001

Population size in 2nd generation (PMFxN)

2190.233 ± 225.815

786.759 ± 167.077

488.376 ± 186.376

21.801

0.002

Hypothetical F2 females (HNf2)

2845.120 ± 403.983

698.133 ± 196.934

111.253 ± 69.868

30.039

 < 0.001

Realised F2 females (RNf2)

876.093 ± 90.326

314.704 ± 66.831

195.350 ± 74.550

21.801

0.002

General fertility rate (GFR)

6.080 ± 1.260

10.108 ± 1.167

31.187 ± 1.183

12.072

0.009

Crude birth rate (CBR)

1.374 ± 0.015

1.529 ± 0.031

2.096 ± 0.131

23.559

 < 0.001

Reproductive value (RV)

192.473 ± 9.188

119.550 ± 11.834

118.788 ± 14.584

12.293

0.008

Vital Index (VI)

0.413 ± 0.018

0.254 ± 0.028

0.129 ± 0.050

17.039

0.003

Trend index (TI)

67.300 ± 4.333

35.087 ± 4.751

14.341 ± 5.758

28.674

 < 0.001

  1. Within the rows means followed by same letter(s) are not significantly different at P < 0.05 by Tukey’s (HSD) test along with F values (ANOVA)