The influence of water-retaining polymer (WRP) and fungicide combinations applied at the time of planting for the control of Guignardia leaf blotch on leaves of horsechestnut (Aesculus hippocastanum L.) as measured by observed pathogen severity.
| Treatment | Leaf blotch severity | |
|---|---|---|
| 2008 | 2009 | |
| Water (control) | 4.6a | 4.1a |
| WRP | 4.5a | 4.0a |
| WRP + Penconazole (0.15 g) | 2.5bc | 4.3a |
| WRP + Penconazole (0.30 g) | 2.2bc | 4.4a |
| WRP + Thiabendazole (0.15 g) | 1.8bc | 4.2a |
| WRP + Thiabendazole (0.30 g) | 2.0bc | 4.1a |
| WRP + Propiconazole (0.15 g) | 1.8bc | 4.4a |
| WRP + Propiconazole (0.30 g) | 1.7bc | 4.7a |
| WRP + Myclobutanil (0.15 g) | 1.5c | 4.0a |
| WRP + Myclobutanil (0.30 g) | 2.1bc | 4.5a |
| WRP + Epoxiconazole (0.15 g) | 2.5bc | 4.9a |
| WRP + Epoxiconazole (0.30 g) | 1.6bc | 4.3a |
| WRP + Potassium Phosphite (0.15 g) | 2.4bc | 4.7a |
| WRP + Potassium Phosphite (0.30 g) | 2.7b | 4.1a |
| Penconazole (spray) | 0.0d | 4.2a |
Note: All values mean of ten trees. Also, lowercase letters indicate significant differences between means for each evaluation date (P = 0.05).