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Table 2 Antagonistic effect of selected Bacillus sp. isolates against tobacco bacterial wilt pathogen Ralstonia solanacearum WS-001

From: Bacillus amyloliquefaciens WS-10 as a potential plant growth-promoter and biocontrol agent for bacterial wilt disease of flue-cured tobacco

Isolated strains

Inhibition zone diameter (cm)

Colony diameter (cm)

Growth inhibition ratio (%)A

WS-10

2.86 ± 0.04

0.7 ± 0.057

75.57 ± 0.644a

WS-25

2.26 ± 0.03

0.9 ± 0.068

57.54 ± 1.164b

WS-05

2.89 ± 0.05

1.33 ± 0.044

51.30 ± 1.380cd

WS-18

2.54 ± 0.06

1.23 ± 0.057

55.20 ± 0.557bc

WS-61

2.82 ± 0.03

1.42 ± 0.068

49.63 ± 1.170cde

WS-115

2.16 ± 0.04

1.14 ± 0.093

47.10 ± 2.364def

WS-47

2.56 ± 0.04

1.28 ± 0.068

50.00 ± 0.771cde

WS-133

1.84 ± 0.05

1.00 ± 0.100

45.64 ± 1.883def

WS-96

2.68 ± 0.11

1.44 ± 0.093

45.62 ± 3.102def

WS-117

2.32 ± 0.09

1.28 ± 0.106

44.77 ± 0.542efg

WS-87

1.8 ± 0.06

1.06 ± 0.073

40.81 ± 2.151fgh

WS-151

2.32 ± 0.08

1.44 ± 0.093

37.67 ± 1.996h

WS-196

1.6 ± 0.02

0.98 ± 0.089

38.82 ± 2.262gh

06

2.56 ± 0.07

1.64 ± 0.093

35.36 ± 2.435h

  1. Significance difference (P < 0.05) between growth inhibitions ratios (%) of different isolated strains are indicated by different small letters within a column according to Duncan's multiple range test at P < 0.05 of five replicates (± SEM)
  2. AGrowth inhibition ratio (%) = [(Inhibition zone diameter – Colony diameter)/Inhibition zone diameter] × 100