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Table 1 Population densities of Aphis gossypii (N) on hydroponic cucumber and effectiveness of biopesticides

From: Efficiency of botanical pesticides against some pests infesting hydroponic cucumber, cultivated under greenhouse conditions

Treatments

Before spray

After 24 h

After 72 h

After 168 h

After 336 h

N

CPD (%)

EF (%)

N

CPD (%)

EF (%)

N

CPD (%)

EF (%)

N

CPD (%)

EF (%)

Matrine

23.6a

19.3ab

− 18.3

39

4.0a

− 83.0

87

3.6a

− 84.5

69

1.3a

− 94.3

97

Spintoram

35.6a

14.3a

− 59.8

46

19.0ab

− 46.7

49

5.0a

− 85.9

81

2.0a

− 94.3

99

Azadirachtin

81.3a

41.0ab

− 49.5

46

17.0ab

− 79.0

81

14.0a

− 82.7

82

10.6a

− 86.8

86

Custard apple

74.3a

45.6b

− 38.5

31

3.6a

− 95.0

95

2.0a

− 97.3

98

6.3a

− 91.4

93

Control

27.6a

31.6ab

15.8

 

39.3b

43.9

 

32.0b

17.0

 

33.3b

21.9

 

Significance level

F = 2.10; df = 4; P ≥ 0.05

F = 4.43; df = 4; P ≤ 0.05

  

F = 4.38; df = 4; P ≤ 0.05

  

F = 13.8; df = 4; P ≤ 0.01

  

F = 30.8; df = 4; P ≤ 0.01

  
  1. The mean number of aphids/leaf (30 leaves per plot); within a column, the means pursued by the same letter are not significantly different (Tukey’s HSD test, α = 0.05)
  2. CPD (%) change in population density, EF (%) percent efficacy (Henderson-Tilton formula)