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Table 2 Fruit yield 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 Yield (kg/tree) z
2015 2016 2017 2018
UTC 50.7 ± 5.9 a A 47.1 ± 5.3 b A 41.5 ± 5.8 a B 48.5 ± 6.5 b A
ASM spray (0.25 g/tree) 52.1 ± 5.2 a A 48.5 ± 5.6 b A 40.4 ± 7.2 a B 48.9 ± 6.2 b A
ASM spray (0.5 g/tree) 51.4 ± 6.7 a A 48.8 ± 7.3 b A 42.5 ± 6.1 a B 50.5 ± 5.7 b A
ASM soil drench (0.25 g/tree) 49.5 ± 5.3 a A 47.7 ± 6.2 b A 40.8 ± 5.9 a B 47.7 ± 6.2 b A
ASM soil drench (0.5 g/tree) 50.2 ± 5.9 a A 47.5 ± 5.7 b A 41.4 ± 6.5 a B 49.1 ± 6.6 b A
ASM injection (0.125 g/tree) 51.1 ± 5.5 a A 50.4 ± 4.8 b A 39.7 ± 5.6 a B 48.4 ± 5.2 b A
ASM injection (0.25 g/tree) 49.8 ± 6.4 a B 57.6 ± 6.9 a A 43.5 ± 5.3 a C 62.2 ± 6.1 a A
IMI spray (0.25 g/tree) 49.2 ± 6.3 a A 48.3 ± 6.1 b A 39.5 ± 5.6 a B 50.4 ± 5.8 b A
IMI spray (0.5 g/tree) 52.7 ± 5.1 a A 50.1 ± 5.3 b A 42.6 ± 6.4 a B 52.2 ± 6.9 b A
IMI soil drench (0.25 g/tree) 48.5 ± 5.3 a A 46.7 ± 6.0 b A 40.4 ± 5.5 a B 48.9 ± 6.3 b A
IMI soil drench (0.5 g/tree) 50.6 ± 5.9 a A 48.2 ± 5.8 b A 39.9 ± 6.2 a B 48.4 ± 5.7 b A
IMI injection (0.125 g/tree) 47.7 ± 6.6 a A 49.4 ± 5.4 b A 42.2 ± 6.4 a B 49.6 ± 6.1 b A
IMI injection (0.25 g/tree) 51.9 ± 6.1 a B 58.7 ± 5.9 a A 43.6 ± 6.5 a C 60.5 ± 5.8 a A
INA spray (0.25 g/tree) 49.5 ± 6.3 a A 47.8 ± 5.7 b A 39.1 ± 5.2 a B 51.6 ± 6.5 b A
INA spray (0.5 g/tree) 51.9 ± 5.2 a B 52.7 ± 6.5 ab B 41.2 ± 5.9 a C 60.7 ± 6.3 a A
INA soil drench (0.25 g/tree) 48.6 ± 6.1 a A 47.7 ± 6.4 b A 39.3 ± 4.5 a B 49.9 ± 5.8 b A
INA soil drench (0.5 g/tree) 50.3 ± 5.9 a A 48.2 ± 5.9 b A 40.6 ± 5.2 a B 48.1 ± 5.5 b A
INA injection (0.125 g/tree) 49.2 ± 5.5 a A 51.4 ± 5.6 b A 43.2 ± 6.9 a B 50.6 ± 5.7 b A
INA injection (0.25 g/tree) 51.1 ± 6.4 a B 60.7 ± 6.5 a A 43.2 ± 6.9 a C 59.8 ± 5.3 a A
SA spray (0.25 g/tree) 50.5 ± 7.1 a A 47.4 ± 5.8 b A 39.3 ± 5.1 a B 49.9 ± 6.2 b A
SA spray (0.5 g/tree) 53.3 ± 6.5 a B 54.6 ± 6.7 ab B 43.4 ± 4.6 a C 63.3 ± 5.8 a A
SA soil drench (0.25 g/tree) 51.6 ± 6.4 a A 48.7 ± 6.3 b A 40.5 ± 4.7 a B 50.9 ± 5.4 b A
SA soil drench (0.5 g/tree) 50.2 ± 5.5 a A 48.6 ± 5.7 b A 40.8 ± 5.6 a B 51.2 ± 6.3 b A
SA injection (0.125 g/tree) 48.6 ± 6.2 a A 49.7 ± 5.5 b A 42.3 ± 5.9 a B 49.8 ± 5.5 b A
SA injection (0.25 g/tree) 51.5 ± 5.6 a B 59.9 ± 6.1 a A 43.9 ± 7.7 a C 62.4 ± 5.7 a A
13-year old healthy tree y 112.6
  1. z Data shown are the means ± SD 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). y averaged fruit yield of 13-year old, healthy Hamlin sweet orange trees in Florida reported by Roka et al. (2000) prior to the era of HLB
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Phytopathology Research

ISSN: 2524-4167

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