Percentage of the leaves injured (PLI) and Horsfall-Barratt (H-B) rating for foliar injury for 6 red maple cultivars exposed to 4 acute levels of ozone.
| Cultivar | PLIz | H-B rating |
|---|---|---|
| Autumn Blazey | 1.9abx | 1.5b |
| Autumn Flame | 0.3b | 1.1c |
| Fairview Flame | 3.4a | 1.6ab |
| Franksred (Red Sunset™) | 1.8ab | 1.4b |
| Northfire | 4.0a | 1.8a |
| October Glory | 2.9a | 1.6ab |
| Ozone Concentration (ppb) | ||
| 0w | 0.0 | 1.0 |
| 100 | 0.9 | 1.3 |
| 200 | 2.5 | 1.6 |
| 300 | 6.2 | 2.1 |
| Significancev | L*** | Q** |
↵z Cv. X O3 not significant; hence, only main effects are reported. PLI and H-B rating data were transformed using an arc-sin transformation before analysis. Retransformed mean values are presented. H-B ratings: 1 = 0%, 2 = 1% to 3%, 3 = 3% to 6% of the leaf area injured.
↵y PLI and H-B rating are across ozone concentrations.
↵x Mean separation within rows by Duncan’s multiple range test, P = 0.05.
↵w PLI and H-B rating are across cultivars.
↵v Linear or quadratic response significant at the 1 % (**) or 0.1 %(***) level.