The influence of fungicide and harpin protein combinations applied as foliar sprays on pathogen severity of Guignardia leaf blotch (Guignardia aesculi) on horse chestnut (Aesculus hippocastanum).
| Treatment | Chlorophyll content | Leaf blotch symptom severityz | Mean seed dry weight |
|---|---|---|---|
| Water (control) | 30.4a | 3.0c | 5.0a |
| Harpin protein (HP) | 36.6ab | 2.0b | 7.2b |
| Boscalid + pyraclostrobin 0.9 g/L | 45.2cd | 1.2ab | 8.3b |
| Boscalid + pyraclostrobin 0.9 g/L + HP | 51.4d | 0.8a | 8.4b |
| Boscalid + pyraclostrobin 0.6 g/L + HP | 43.9bcd | 1.5ab | 8.0b |
| Boscalid + pyraclostrobin 0.3 g/L + HP | 37.2abc | 1.8b | 7.5b |
↵zAll values mean of 80 leaves (10 leaves per tree) from 8 randomized complete blocks with a single tree replication per block.
Numbers within a column followed by a common letter are not significantly different according to the Kruskal-Wallis Multiple Comparison Z-test (P ≤ 0.05).