Table 2.

The 2019–2020 QUIK-jet® Micro-InjectionTM and 2020–2021 TREE I.V. Micro-InfusionTM system trials. The proportion of propiconazole-injected sassafras trees (and percent of total per treatment) exhibiting Harringtonia lauricola inhibition in wood-tissue discs obtained 30 cm above or below inoculation points 3, 12, and 15 months post-inoculation with H. lauricola using the Arborjet QUIK-jet® Micro-InjectionTM and TREE I.V. Micro-InfusionTM delivery systems. Propiconazole (PZOL); Harringtonia lauricola (HL); agar (AG).

3 months12 months15 months
Injection systemTreatmentAboveBelowAboveBelowAboveBelow
QUIK-jet® Micro-InjectionTM (2019–2020)PZOL + HLa1/7 (14%)1/7 (14%)1/7 (14%)0/7 (0%)3/4 (75%)3/4 (75%)
PZOL + AGb5/8 (63%)6/8 (75%)1/7 (14%)5/7 (71%)1/1 (100%)1/1 (100%)
TREE I.V. Micro-InfusionTM (2020–2021)PZOL + HLa5/13 (38%)6/13 (46%)10/13 (77%)8/13 (62%)N/AN/A

  • ↵aTrees injected with propiconazole and inoculated with Harringtonia lauricola

  • ↵bTrees injected with propiconazole and inoculated with agar