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Table 1 Population densities and reduction (%) of the aphid, A. gossypii, on squash 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)
52.13
± 13.7A
103.00
± 21.9A
179.80
± 52.2A
192.93
± 37.3A
126.47
± 36.0A
68.93
± 23.3A
24.47
± 8.4A
5 47.87
± 11.3A
88.27
± 17.0B
14.32
± 7.4
118.47
± 29.1B
34.08
± 5.0
106.20
± 20.1B
44.96
± 6.7
66.20
± 12.9B
47.68
± 7.6
19.33
± 7.9B
67.84
± 14.2
6.40
± 2.9B
73.88
± 4.5
10 49.47
± 13.0A
75.60
± 14.3B
26.56
± 10.6
49.13
± 16.2C
72.68
± 6.5
17.87
± 7.3C
92.00
± 0.7
8.73
± 5.1C
93.10
± 2.8
3.60
± 3.0C
94.74
± 2.0
1.93
± 1.8C
92.08
± 2.1
F values
(with df = 2.42)
0.432 8.730 50.237 186.907 105.003 85.274 77.561
T values
(with df = 1.8)
2.125 10.542 15.572 12.482 4.198 8.147
P 0.652 < 0.001 0.066 < 0.001 < 0.001 < 0.001 < 0.001 < 0.001 < 0.001 < 0.001 < 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)