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Table 3 Population densities and reduction (%) of the aphid, A. gossypii, 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)
3.87
± 2.4A
11.53
± 4.1A
15.20
± 4.8A
16.47
± 5.4A
14.60
± 5.8A
12.47
± 5.3A
  7.67
± 3.7A
5 4.73
± 3.2A
4.40
± 1.9B
61.54
± 7.2
1.47
± 1.5B
90.24
± 4.4
0.40
± 0.7B
97.60
± 1.8
0.00B 100 0.00B 100 0.00B 100
10 3.53
± 2.9A
2.47
± 2.4B
78.78
± 11.5
0.47
± 0.7B
96.96
± 2.6
0.00B 100 0.00B 100 0.00B 100 0.00B 100
F values
(with df = 2.42)
0.710 38.718 116.077 134.497 96.557 82.893 65.194
T values
(with df = 1.8)
2.837 2.936   2.981    
P 0.497 < 0.001 0.022 < 0.001 0.019 < 0.001 0.018 < 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 aphid nymphs per leaf (mean ± SD). Reduction = percentage (%) of reduction comparing to control (mean ± SD)