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 11:             Quinone outside inhibitors (QoI);
Group 11+3:        QoI + DMI (refer to Group 11 in table)
Group 13:             Aza-napthalenenes;
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.

3. Mixtures – co-formulations or tank mixes with label rate of alternative mode of action.

3 5 7 11 13 U6 50
Maximum number of consecutive sprays when applied as the only fungicide 2 2 None None 2 2 2
Maximum number of consecutive sprays when applied as a tank-mix or co-formulant 2 2 2 2 2 2 2
Maximum number of sprays per season 3 3 3 2 3 2 4

4. 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.

5. Group 11:

a. if applied alone, as the only fungicide, do not make consecutive applications, apply a maximum of 2 sprays per season.
b. if applied with another fungicide, can be used consecutively except where they have been used routinely for many seasons, apply a maximum of 2 sprays per season.

Content last updated: July 16, 2021

CropLife Australia’s Resistance Management Strategies provide a guide for crop protection product rotation through product groups. The strategies are a useful tool that supports farmers’ adoption of resistance management. All crop protection products must be handled and applied strictly as specified on the product label or APVMA permits.

These Resistance Management Strategies do not replace product labels. They are a guide only and do not endorse particular products, groups of products or cultural methods in terms of their performance. It is important to check with the Australian regulator’s (APVMA) product database for contemporary information on products and active constituents. The database can be sourced through

The information given in this strategy is provided in good faith and without any liability for loss or damage suffered as a result of its application and use. Advice given in this strategy is valid as at 16 July 2021. All previous versions of this strategy are now invalid.