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Table 2 Demographic attributes of H. variegata when fed on aphid, A. craccivora, infested on four host plants

From: Demographic parameters of the predaceous ladybird, Hippodamia variegata (Goeze), on the aphid species, Aphis craccivora (Koch), reared on four host plants

Host plant Demographic parameters
R o r m λ T c D.T.
Dolichos lablab 457.93 ± 11.59a (431.72–484.15) 0.18 ± 0.0031a (0.1771–.1910) 1.20 ± 0.0037a (1.1938–1.2105) 33.27 ± 0.5259b (32.081–34.461) 3.76 ± 0.06c (3.6216–3.9060)
Vigna unguiculata 450.21 ± 11.00a (425.31–475.09) 0.19 ± 0.0035a (0.1778–.1937) 1.20 ± 0.0042a (1.1945–1.2136) 32.87 ± 0.7058b (31.288–34.482) 3.72 ± 0.07c (3.572–3.8895)
Cajanus cajan 261.20 ± 7.75b (243.68–278.73) 0.15 ± 0.0031a (0.1469–.1538) 1.16 ± 0.0018a (1.1583–1.1663) 37.00 ± 0.4450a (35.997–38.011) 4.60 ± 0.05a (4.5041–4.7128)
Renunculus sceleratus 82.16 ± 4.06c (72.99–91.35) 0.16 ± 0.0036a (0.1491–.1654) 1.17 ± 0.0042a (1.1607–1.1798) 28.00 ± 0.7849c (26.256–29.807) 4.40 ± 0.10b (4.1791–4.6333)
  1. Data are Mean ± S.E. estimated from Jack-knife Method that includes Student t-test for pair-wise group comparison. Different letters denote significance at P<0.01 within the distribution estimated by Student's t-test. Data in parentheses are lower and upper range of the demographic parameter estimated from Jack-knife Method
  2. Ro net reproductive rate (number of female population produce from one mother), rm the intrinsic rate of increase for the population per individual, λ finite rates of increase for the population per individual, Tc generation time (time need to complete one generation), D.T. population doubling times (time needed to double the population)