Grape – Powdery mildew

Crop(s):          Grape

Disease(s):     Powdery mildew

Resistance Management Strategy for:

Group 3:               Demethylation inhibitors (DMI);
Group 5:               Amines (morpholines);
Group 7:               Succinate dehydrogenase inhibitors (SDHI);
Group 7+3:         SDHI + DMI;
Group 7+12:      SDHI + phenylpyrroles (PP);
Group 11:             Quinone outside inhibitors (QoI);
Group 11+3:        QoI + DMI;
Group 13:             Aza-napthalenenes;
Group 13+3        Aza-napthalenenes + DMI;
Group 19              Chitin synthase inhibitor;
Group U6:            Phenyl-acetamide; and
Group 50:            Actin disruptors (aryl-phenyl-ketone).

1. Apply all these fungicides preventatively.
2. Consecutive applications include from the end of one season to the start of the next. Medium to high risk fungicides (Group 7 and 11) if used consecutively should be applied in a mixture or co-formulation with a registered, alternative mode of action for which resistance is not known – where these fungicides have been routinely used for many seasons, field research indicates there is an increased risk of powdery mildew resistance. To ensure effective powdery mildew control in these circumstances, either use alternative modes of action or apply in mixtures.
3. Do not apply more than two consecutive sprays of Group 3, 5, 13, 19, 50 and U6.