Disease(s): Downy Mildew
Resistance Management Strategy for:
Group 4 Phenylamide;
Group 11 Quinone outside Inhibitor (QoI);
Group 28 + 43 Carbamate plus Benzamide;
Group 40 Carboxylic acid amide;
Group 49 Oxysterol binding protein inhibitor (OSBP; and
Group 49 + 11 OSBP + QoI.
- Start disease control early and maintain a regular protectant program. Fungicide applications need to start before the 6 leaf stage for early season control to be effective.
- When conditions favour disease development (high humidity, still weather, overcast skies), prior to visible disease symptoms (white downy growth on the underside of lower leaves followed by brown angular lesions) apply a single spray of a Group 49 fungicide, or up to two consecutive sprays of a Group 4, 11, 40 or 28 + 43 product (including mixtures containing Group 4, 11 or 40), at the interval recommended on the label. Then resume the program of sprays using products from a different group to the Group 4, 11, 40, 49 or 28 + 43 products just applied.
- DO NOT apply more than two sprays per season of a product containing a Group 4, 11, 40 or 49+11 fungicide. Group 49 containing sprays should not exceed 33% of the of the total number of fungicide sprays per season.
- DO NOT apply more than three sprays of a Group 28+43 product per crop.
- Apply Group 11 and 49+11 fungicides preventatively.
- Apply Group 4 and 49 fungicides preventatively and only in mixtures with effective protectant fungicide from a different mode of action group.
- DO NOT use a Group 49 (or 49+11) product if it will be the last fungicide applied to the crop.