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Egyptian Journal of Biological Pest Control

Table 3 Growth inhibition rate (%) of Bacillus spp. butanolic extracts tested at two concentrations against the mycelial growth of various potato wilt-causing fungi

From: Multi-species endophytic Bacillus for improved control of potato soilborne and tuber-borne diseases in Tunisia: from laboratory to field conditions

Bacterial treatment

Concentration (%)

Fungi tested

Fusarium oxysporum f. sp. tuberosi

Rhizoctonia solani

Colletotrichum coccodes

Average

Bacillus tequilensisSV39

2.5

28.43

71.55

40.72

46.90 cdd*

5.0

42.97

78.31

67.97

63.08 a

Averagec*

35.70 c+

74.93 a

54.34 a

54.99 Aa*

B. subtilis SV41

2.5

29.73

55.77

19.93

35.15 e

5.0

47.12

64.51

59.11

56.91 b

Average

38.43 bc

60.14 b

39.52 b

46.03 B

B. cereus S42

2.5

26.25

58.31

19.59

34.72 e

5.0

37.39

66.48

46.17

48.33 c

Average

29.30 d

62.39 b

32.88 c

41.52 C

B. methylotrophicusSV44

2.5

37.12

23.94

20.95

27.34 f

5.0

48.43

42.82

38.67

43.31 d

Average

42.78 b

33.38 c

29.81 c

35.32 D

B. amyloliquefaciens subsp. plantarum SV65

2.5

47.12

72.96

17.21

45.76 cd

5.0

56.69

78.03

66.27

67.00 a

Average

51.91 a

75.49 a

41.74 b

56.38 A

B. tequilensis SV104

2.5

47.56

58.03

29.47

45.02 cd

5.0

57.12

65.35

78.19

66.89 a

Average

52.34 a

61.69 b

53.83 a

55.95 A

Averageb*

 

41.74 b

61.34 a

42.02 b

 
  1. aMean mycelial growth inhibition per bacterial treatment for all concentrations and all fungal pathogens combined
  2. bMean mycelial growth inhibition per fungal pathogen for all bacterial treatments and all concentrations combined
  3. cMean mycelial growth inhibition per bacterial treatment and per fungal pathogen for all concentration combined
  4. dMean mycelial growth inhibition per bacterial treatment per concentration for all fungal pathogens combined
  5.  + Means within columns followed by the same letter are not significantly different according to Duncan's multiple range test at P ≤ 0.05
  6. *For fungal pathogens, bacterial treatments tested and concentrations applied, values (means) followed by the same letter are not significantly different according to Duncan's multiple range test at P ≤ 0.05
  7. LSD (Fungal pathogens × Butanolic extracts × Concentrations) = 7.26% at P ≤ 0.05
  8. Growth inhibition was noted after incubation at 25 °C for 3 days (R. solani), 7 days (F. oxysporum f. sp. tuberosi) and 8 days (C. coccodes) on PDA medium
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