Selected silicon fertilizers and inducing agents applied by foliar sprays compared for the control of Venturia inaequalis and V. pirina on fruit of apple (Malus cv. Golden Delicious) and pear (Pyrus communis ‘Williams’ Bon Chrétien’), respectively, as measured by an observed scab severity indexz.
| Treatment | Apple scab severity on fruity | Pear scab severity on fruity | ||
|---|---|---|---|---|
| 2014 | 2015 | 2014 | 2015 | |
| Water (control) | 2.3a | 2.5a | 2.1a | 1.8a |
| Sil-MATRIX (10 ml liter of water) | 1.9ab | 1.8ab | 1.5b | 1.3b |
| Salicylaldehyde | 1.4bc | 1.6b | 1.4bc | 1.4ab |
| Fossil (10 ml liter of water) | 1.5bc | 1.2bc | 1.2bc | 1.0bc |
| Sirius (10 ml liter of water) | 1.2cd | 1.5bc | 0.9cd | 1.1bc |
| Rigel (3 ml liter of water) | 0.7de | 0.9cd | 0.6d | 0.7c |
| Topas (1.5 ml liter of water) | 0.2e | 0.4d | 0.4d | 1.0c |
| Treatment | <0.001 | <0.001 | <0.001 | 0.001 |
↵z Scab severity index: 0 = no scab observed; 1 = less than 5% of leaves affected and no aesthetic impact; 2 = 5%–20% of leaves affected with some yellowing but little or no defoliation; 3 = 21%–50% of leaves affected, significant defoliation, and/or leaf yellowing; 4 = 51%–80% of leaves affected, severe foliar discoloration; 5 = 81%–100% of foliage affected with 90%–100% defoliation.
↵y Mean of ten randomized complete blocks with one tree per block.
Note: Lowercase letters indicate significant differences between means for each evaluation date by Tukey highly significance test (P = 0.05).