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Table 2 Population growth parameters of sequential generations of Trichogramma embryophagum reared on Sitotroga cerealella eggs

From: How long-term mass rearing affects the quality of the Trichogramma embryophagum (Hartig) (Hymenoptera: Trichogrammatidae) reared on Sitotroga cerealella (Olivier) eggs

No. generation Gross reproductive rate (GRR) (eggs/individual) Net reproductive rate (R0) (eggs/individual) Intrinsic rate of natural increase (r) (d−1) Finite rate of increase (λ) (d−1) Mean generation time (T) (d)
5 40.96 ± 3.71a 38.21 ± 3.65a 0.296 ± 0.008a 1.345 ± 0.011a 12.29 ± 0.13bc
10 33.89 ± 3.60ab 31.32 ± 3.53ab 0.273 ± 0.010ab 1.314 ± 0.013ab 12.63 ± 0.13a
15 27.48 ± 3.12bc 24.73 ± 2.96bc 0.257 ± 0.011bc 1.293 ± 0.014bc 12.48 ± 0.17ab
20 22.72 ± 2.51 cd 19.62 ± 2.35 cd 0.244 ± 0.011 cd 1.277 ± 0.013 cd 12.18 ± 0.14bcd
25 18.22 ± 2.00de 16.43 ± 1.93de 0.228 ± 0.010de 1.256 ± 0.012de 12.30 ± 0.11bc
28 18.36 ± 2.01de 15.75 ± 1.90def 0.223 ± 0.010def 1.250 ± 0.012def 12.37 ± 0.14abc
30 15.69 ± 1.76ef 13.78 ± 1.68efg 0.218 ± 0.011def 1.244 ± 0.013def 12.02 ± 0.13cde
32 14.67 ± 1.60ef 12.61 ± 1.53efg 0.213 ± 0.011ef 1.238 ± 0.014ef 11.88 ± 0.12def
34 12.50 ± 1.52f 11.33 ± 1.45 fg 0.208 ± 0.012ef 1.231 ± 0.014ef 11.68 ± 0.14ef
37 11.74 ± 1.45f 10.65 ± 1.40 g 0.203 ± 0.012ef 1.225 ± 0.015ef 11.63 ± 0.15f
40 11.74 ± 1.64f 9.75 ± 1.48 g 0.192 ± 0.013f 1.212 ± 0.016f 11.87 ± 0.14def
  1. The means marked by the same letters within the same column are not significantly different (Paired-bootstrap test, P < 0.05)