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Table 4 Population densities and reduction (%) of the whitefly, B. tabaci, on sweet pepper plants received two releasing rates of the second larval instar of C. carnea

From: Field evaluation of indigenous predacious insect, Chrysoperla carnea (Steph.) (Neuroptera: Chrysopidae), fitness in controlling aphids and whiteflies in two vegetable crops

  28 Jul. 7 Aug. 17 Aug. 27 Aug. 6 Sep. 16 Sep. 26 Sep.
Releasing rate per plant Infestation Infestation Reduction Infestation Reduction Infestation Reduction Infestation Reduction Infestation Reduction Infestation Reduction
Control
(untreated plants)
32.73
± 2.5A
5.33
± 2.8A
  6.73
± 3.9A
  6.93
± 3.7A
  5.93
± 3.7A
  7.07
± 4.6A
  7.00
± 4.2A
5 3.13
± 3.0A
2.47
± 2.5B
53.60
± 27.4
0.60
± 1.1B
91.06
± 6.6
0.13
± 0.5B
97.98
± 4.5
0.00B 100 0.00B 100 0.00B 100
10 2.60
± 2.8A
0.60
± 1.1C
89.06
± 12.6
0.13
± 0.5B
97.92
± 4.7
0.00B 100 0.00B 100 0.00B 100 0.00B 100
F values
(with df = 2.42)
0.151 16.839 35.870 51.947 39.549 34.848 40.833
T values
(with df = 1.8)
2.633 1.905 1.000  
P 0.861 < 0.001 0.030 < 0.001 0.093 < 0.001 0.347 < 0.001 < 0.001 < 0.001
  1. Means within each column bearing different superscript letters are significantly different according to Duncan test (P = 0.05). Infestation = no. of whitefly nymphs per leaf (mean ± SD). Reduction = percentage (%) of reduction comparing to control (mean ± SD)