Table 6. Grapevine Powdery Mildew (Erysiphe necator) incidence and severity in field trials experiments.
| Trial | Treatment* | Incidence (%) § on clusters | Severity (%) § on clusters |
|---|---|---|---|
| 8DAA7 ф | |||
| Non-treated control | 92.8a ¥ | 21.8b | |
| 1 | Blad-oligomer (540 g/ha) | 58.6a | 7.8b |
| Blad-oligomer (670 g/ha) | 24.8b | 18.5b | |
| Pristine (335 g ai/ha) | 10.5b | 8.8b | |
| 14DAA4 | |||
| Non-treated control | 50.9aa | 39.3a | |
| 2 | Blad-oligomer (335 g/ha) | 2.7c | 3.3c |
| Blad-oligomer (450 g/ha) | 5.1c | 3.1c | |
| Folicur (170 g ai/ha) | 27.3b | 22.6b | |
| 10DAA2 | |||
| Non-treated control | 100.0a | Non rated | |
| 3 | Blad-oligomer (335 g/ha) | 40.4b | Non rated |
| Blad-oligomer (450 g/ha) | 30.6b | Non rated | |
| Pristine (335 g ai/ha) | 55.2b | Non rated | |
| 14DAA6 | |||
| Non-treated control | 60.0a | 34.5a | |
| 4 | Blad-oligomer (335 g/ha) | 3.0b | 4.8b |
| Blad-oligomer (450 g/ha) | 2.3b | 1.0b | |
| Pristine (335 g ai/ha) | 2.0b | 0.5b |
* Treatment conditions are described in Table 2.
§ Incidence was defined as the percentage of grape clusters with powdery mildew within a sample of 20 clusters. Severity was expressed as the percent of berries infected per cluster.
ф DAA—means days after application.
¥ Means followed by the same letter do not significantly differ (P = 0.05, Duncan´s New MRT). Mean comparisons performed only when AOV Treatment P(F) is significant at mean comparison OSL.