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Table 1 Candidatus Liberibacter asiaticus (Las) titers in leaf samples of Hamlin sweet orange trees treated with various SAR inducers in a three-year field trial (2015–2018)

From: Evaluation of the control effect of SAR inducers against citrus Huanglongbing applied by foliar spray, soil drench or trunk injection

Treatment

Las titer (Log10[cells/g of leaf tissue]) z

Nov.2015

Apr.2016

Oct.2016

Apr.2017

Oct.2017

Apr.2018

Oct.2018

UTC

6.87 a D

7.16 a CD

7.37 a BC

7.42 a BC

7.51 a ABC

7.64 a AB

7.88 a A

ASM spray (0.25 g/tree)

6.92 a D

7.11 a CD

7.29 a CD

7.33 a BC

7.47 a ABC

7.56 a AB

7.78 ab A

ASM spray (0.5 g/tree)

6.84 a D

7.06 a CD

7.15 a CD

7.30 a BC

7.44 a ABC

7.67 a AB

7.76 ab A

ASM soil drench (0.25 g/tree)

7.07 a D

7.21 a CD

7.26 a CD

7.47 a BC

7.51 a ABC

7.64 a AB

7.87 a A

ASM soil drench (0.5 g/tree)

6.96 a D

7.11 a CD

7.22 a CD

7.28 a BC

7.42 a ABC

7.66 a AB

7.79 a A

ASM injection (0.125 g/tree)

6.81 a C

7.09 a BC

7.27 a B

7.39 a B

7.55 a AB

7.71 a A

7.85 a A

ASM injection (0.25 g/tree)

7.13 a A

7.17 a A

7.23 a A

7.25 a A

7.27 a A

7.17 b A

7.21 c A

IMI spray (0.25 g/tree)

6.91 a C

7.15 a BC

7.22 a AB

7.32 a AB

7.49 a AB

7.60 a A

7.78 ab A

IMI spray (0.5 g/tree)

7.02 a C

7.24 a BC

7.29 a BC

7.35 a BC

7.52 a AB

7.59 a AB

7.82 a A

IMI soil drench (0.25 g/tree)

7.11 a D

7.19 a CD

7.30 a CD

7.38 a BC

7.54 a ABC

7.68 a AB

7.89 a A

IMI soil drench (0.5 g/tree)

6.93 a D

7.04 a CD

7.25 a CD

7.33 a BC

7.52 a ABC

7.57 a AB

7.85 a A

IMI injection (0.125 g/tree)

7.10 a D

7.24 a CD

7.31 a CD

7.44 a BC

7.57 a ABC

7.66 a AB

7.83 a A

IMI injection (0.25 g/tree)

7.06 a A

7.15 a A

7.21 a A

7.17 a A

7.28 a A

7.36 ab A

7.28 c A

INA spray (0.25 g/tree)

6.95 a C

7.21 a BC

7.32 a AB

7.42 a AB

7.53 a AB

7.60 a A

7.79 a A

INA spray (0.5 g/tree)

7.08 a B

7.19 a B

7.26 a AB

7.31 a AB

7.34 a AB

7.41 a A

7.43 bc A

INA soil drench (0.25 g/tree)

7.17 a D

7.25 a CD

7.32 a CD

7.43 a BC

7.55 a ABC

7.69 a AB

7.87 a A

INA soil drench (0.5 g/tree)

6.91 a D

7.17 a CD

7.27 a CD

7.39 a BC

7.52 a ABC

7.65 a AB

7.81 a A

INA injection (0.125 g/tree)

6.84 a E

7.12 a DE

7.29 a CD

7.42 a BCD

7.55 a ABC

7.67 a AB

7.86 a A

INA injection (0.25 g/tree)

7.10 a A

7.21 a A

7.17 a AB

7.29 a AB

7.33 a AB

7.37 ab A

7.34 bc A

SA spray (0.25 g/tree)

6.88 a D

7.01 a CD

7.27 a BC

7.35 a BC

7.46 a AB

7.61 a AB

7.81 a A

SA spray (0.5 g/tree)

6.93 a B

7.13 a B

7.24 a AB

7.28 a AB

7.31 a A

7.37 ab A

7.48 bc A

SA soil drench (0.25 g/tree)

7.14 a D

7.21 a CD

7.32 a BCD

7.39 a BC

7.56 a ABC

7.69 a AB

7.86 a A

SA soil drench (0.5 g/tree)

6.85 a D

7.01 a CD

7.15 a CD

7.31 a BC

7.55 a AB

7.66 a AB

7.82 a A

SA injection (0.125 g/tree)

7.07 a D

7.22 a CD

7.33 a BCD

7.43 a BC

7.57 a AB

7.65 a AB

7.85 a A

SA injection (0.25 g/tree)

7.12 a A

7.24 a A

7.19 a A

7.21 a A

7.27 a A

7.22 b A

7.24 c A

  1. z Data shown are the means of six replicates (n = 6). Values in the same row followed by different superscript uppercase letters are significantly different within each treatment (P < 0.05). Values in the same column followed by different subscript lowercase letters are significantly different at each sampling time (P < 0.05)