The 2019–2020 QUIK-jet® Micro-InjectionTM system trial. Least squares mean (± 1 SE) for weeks to development of ≥ 50% crown decline and tree mortality among treatments using the Arborjet QUIK-jet® Micro-InjectionTM system following inoculation with Harringtonia lauricola or sterile agar. Within a column, differing letters denote significant difference (Tukey-Kramer test; α = 0.05). Note: where survival exceeded 62 weeks, values were rounded to 63 for mean calculation and analyses. Standard error (SE); Propiconazole (PZOL); Harringtonia lauricola (HL); agar (AG); standard error of the mean (SEM).
| Tree (n) | Weeks to ≥ 50% crown mortality | Weeks of tree survival | Crown score at final evaluation | HL reisolated at tree death or 12 months | |
|---|---|---|---|---|---|
| PZOL + HLa | 1 | > 62 | > 62 | 2 | - |
| 2 | 49 | 62 | Dead | Y | |
| 3 | 49 | 49 | Dead | Y | |
| 4 | > 62 | > 62 | 1 | - | |
| 5 | > 62 | > 62 | 1 | - | |
| 6 | 49 | 60 | Dead | Y | |
| 7 | > 62 | > 62 | 1 | - | |
| Mean (± 1 SEM) | 57.0 ± 2.3 b | 60.4 ± 1.4 b | - | - | |
| HLb | 1 | 18 | 49 | Dead | Y |
| 2 | 4 | 10 | Dead | Y | |
| 3 | 4 | 14 | Dead | Y | |
| 4 | 8 | 14 | Dead | Y | |
| 5 | 4 | 20 | Dead | Y | |
| 6 | 10 | 56 | Dead | Y | |
| 7 | 18 | 49 | Dead | Y | |
| 8 | 4 | 6 | Dead | Y | |
| 9 | 8 | 10 | Dead | Y | |
| Mean (± 1 SEM) | 8.7 ± 2.1 a | 24.9 ± 6.8 a | - | - | |
| AGc | 1 | 49 | > 62 | 2 | Y |
| 2 | 49 | > 62 | 2 | Y | |
| 3 | 49 | > 62 | 2 | Y | |
| 4 | 49 | > 62 | 2 | Y | |
| 5 | 60 | > 62 | 1 | N | |
| 6 | 56 | > 62 | 2 | Y | |
| 7 | 60 | > 62 | 1 | N | |
| 8 | 60 | > 62 | 1 | Y | |
| Mean (± 1 SEM) | 54.4 ± 2.2 b | 61.3 ± 1.4 b | - | - | |
| PZOL + AGd | 1 | > 62 | > 62 | 1 | Y |
| 2 | 49 | > 62 | 2 | Y | |
| 3 | 49 | 49 | Dead | N | |
| 4 | 60 | > 62 | 2 | Y | |
| 5 | 56 | > 62 | 2 | Y | |
| 6 | 49 | 60 | Dead | Y | |
| 7 | 60 | 60 | Dead | N | |
| 8 | 56 | 60 | Dead | Y | |
| Mean (± 1 SEM) | 55.2 ± 2.2 b | 59.5 ± 1.4 b | - | - |