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Table 3 Pre-harvest fruit drop 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 No. of fruit dropped z
2015 2016 2017 2018
UTC 136 ± 29 a B 149 ± 32 a B 214 ± 43 a A 148 ± 35 a B
ASM spray (0.25 g/tree) 128 ± 26 a B 139 ± 28 a B 217 ± 47 a A 137 ± 33 a B
ASM spray (0.5 g/tree) 139 ± 32 a B 145 ± 31 a B 229 ± 45 a A 147 ± 32 a B
ASM soil drench (0.25 g/tree) 133 ± 27 a B 148 ± 34 a B 237 ± 46 a A 146 ± 29 a B
ASM soil drench (0.5 g/tree) 129 ± 24 a B 141 ± 28 a B 221 ± 41 a A 135 ± 31 a B
ASM injection (0.125 g/tree) 135 ± 32 a B 124 ± 30 a B 216 ± 38 a A 129 ± 33 a B
ASM injection (0.25 g/tree) 143 ± 28 a B 78 ± 21 b C 235 ± 45 a A 69 ± 24 b C
IMI spray (0.25 g/tree) 126 ± 29 a B 139 ± 33 a B 219 ± 36 a A 144 ± 30 a B
IMI spray (0.5 g/tree) 138 ± 31 a B 124 ± 28 a B 228 ± 41 a A 152 ± 37 a B
IMI soil drench (0.25 g/tree) 143 ± 30 a B 132 ± 31 a B 242 ± 48 a A 137 ± 31 a B
IMI soil drench (0.5 g/tree) 132 ± 28 a B 147 ± 35 a B 233 ± 44 a A 144 ± 33 a B
IMI injection (0.125 g/tree) 145 ± 34 a B 131 ± 29 a B 226 ± 39 a A 150 ± 38 a B
IMI injection (0.25 g/tree) 128 ± 29 a B 71 ± 20 b C 215 ± 37 a A 79 ± 21 b C
INA spray (0.25 g/tree) 121 ± 29 a B 138 ± 32 a B 237 ± 48 a A 139 ± 35 a B
INA spray (0.5 g/tree) 137 ± 30 a B 145 ± 35 a B 219 ± 46 a A 70 ± 25 b B
INA soil drench (0.25 g/tree) 129 ± 28 a B 139 ± 32 a B 240 ± 48 a A 142 ± 31 a B
INA soil drench (0.5 g/tree) 140 ± 29 a B 151 ± 31 a B 226 ± 44 a A 133 ± 30 a B
INA injection (0.125 g/tree) 132 ± 31 a B 127 ± 27 a B 215 ± 35 a A 127 ± 34 a B
INA injection (0.25 g/tree) 145 ± 32 a B 72 ± 20 b C 230 ± 43 a A 77 ± 24 b C
SA spray (0.25 g/tree) 136 ± 27 a B 148 ± 32 a B 242 ± 49 a A 129 ± 35 a B
SA spray (0.5 g/tree) 129 ± 30 a B 140 ± 34 a B 227 ± 44 a A 81 ± 22 b C
SA soil drench (0.25 g/tree) 133 ± 27 a B 148 ± 34 a B 237 ± 46 a A 146 ± 29 a B
SA soil drench (0.5 g/tree) 142 ± 32 a B 133 ± 27 a B 222 ± 48 a A 133 ± 33 a B
SA injection (0.125 g/tree) 126 ± 28 a B 140 ± 31 a B 235 ± 44 a A 142 ± 35 a B
SA injection (0.25 g/tree) 141 ± 31 a B 77 ± 23 b C 225 ± 42 a A 69 ± 21 b C
  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)
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Phytopathology Research

ISSN: 2524-4167

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