Table 3.

The injury index scores for ozone symptoms on the Gleditsia triacanthos inermis ‘imperial’ and the Platanus acerifolia ‘Bloodgood’ at each site and for each year are shown below. Although there was considerable variation in the numerical scores, these two cultivars were consistently the most ozone sensitive at all four sites and for all three years.

CultivarLocationInjury index score1
‘Imperial’Rikers Island19182152118
New York Botanical Garden21552134
Cary Arboretum180175160172
Cultivar Average:131
‘Bloodgood’Rikers Island19513275134
New York Botanical Garden654053
Cary Arboretum905310081
Cultivar Average:98
  • 1 Based on the four trees of each cultivar at each location and using the maximum injury scores for that growing season.