Apples, Pears – Apple and Pear scab

Crop(s):          Apples, Pears

Disease(s):    Apple and Pear scab

Resistance Management Strategy for:

Group 3             Demethylation inhibitors (DMI);
Group 7             Succinate dehydrogenase inhibitors (SDHI);
Group 7 + 11    SDHI + QoI
Group 9             Anilinopyrimidines (AP);
Group 11           Quinone outside inhibitors (QoI); and
Group U12        Guanidines.

1. To prevent or delay the onset of resistance to Group 3 fungicides, do not apply more than four Group 3 sprays alone per season.
2. If more sprays, are required apply a tank mix of a Group 3 with a Group 9 or suitable product from Groups M or M1 to M9, or apply a registered product containing a combination of a Group 3 and a Group 9 fungicide.
3. Do not apply more than four sprays per season of Group 9 fungicides (solo products).
4. Do not apply more than four sprays per season of products containing a combination of a Group 9 and a Group 3 fungicide and no more than two consecutive applications.
5. Where spray programs include solo Group 9 products and combination products, the maximum cumulative number of applications is four per season and no more than two consecutive applications.
6. In locations where resistance has been reported use a Group 9 only in mixture with a registered, alternative mode of action for which resistance is not known.
7. Always apply SDHI fungicides as per the label recommendations and only use as preventative treatment.
8. Do not apply more than three sprays per season of Group 7 or Group 11 fungicides. If two consecutive applications of Group 7 or Group 11 fungicides are used, then they must be followed by at least the same number of applications of fungicide(s) from a different mode of action group(s) before a Group 7 or Group 11 fungicide is used again, either in the current or following season.
9. When mixtures are used for SDHI fungicide resistance management, applied as tank mix or as a co-formulated mixture, the mixture partner should provide satisfactory disease control when used alone on the target disease and must have a different mode of action.
10. Pomefruit spray guidelines for SDHI fungicides:

1. To prevent or delay the onset of resistance to Group U12, do not apply more than three consecutive sprays of Group U12, and no more than a total of six Group U12 sprays per season.
2. If more sprays are required, tank mix Group U12 with a protectant product at the registered rate.