Strawberry – Grey mould (𝘉𝘰𝘵𝘳𝘺𝘵𝘪𝘴)

Crop(s):          Strawberry

Disease(s):     Grey mould (Botrytis)

Resistance Management Strategy for:

Group 2                  Dicarboximide;
Group 7                  Succinate dehydrogenase inhibitors (SDHI);
Group 7+3            SDHI + Demethylation inhibitors (DMI);
Group 7+11           SDHI + Quinone outside inhibitors (QoI);
Group 7+12           SDHI + phenylpyrroles (PP);
Group 9                  Anilinopyrimidine (AP);
Group 9+12           AP + PP; 
Group 17               Hydroxyanilide;
Group 19               Chitin synthase inhibitor;
Group 21              Quinoline inside Inihibitory (Qil); and
Group 52               Phenyl-propanol (DHODHI).

1. Apply a program of protectant fungicides during flowering. If conditions favour disease development during this period, use a Group 2, 9, 12, 17, 19 or 21 fungicide.
2. Do not apply more than two consecutive sprays of Group 2, 9, 12, 17, 19 or 21 fungicides.
3. Do not apply Group 52 as consecutive applications, or more than three (3) times per season.
4. If applying Group 7 (including 7+3, 7+11 or 7+12) fungicides, do not apply more than two consecutive sprays before changing to another group. Do not apply more than three Group 7 sprays per season. If consecutive sprays are used, then use the same number of sprays of an alternative group before using another Group 7, including sprays in consecutive seasons. If three or fewer Botrytis fungicide sprays are applied per crop, use only one spray containing a Group 9 fungicide. If four to six sprays are applied per crop use a maximum of two sprays containing Group 9 or 9+12 fungicides. If seven or more sprays are applied per crop use a maximum of three sprays containing Group 9 or 9+12  fungicides.
5. If three or fewer Botrytis fungicide sprays are applied per crop, use only one spray containing a Group 12 fungicide. If four to six sprays are applied per crop use a maximum of two sprays containing Group 12 fungicides. If seven or more sprays are applied per crop use a maximum of three sprays containing Group 12 fungicides.
6. Do not apply Group 19 fungicides more than 6 times per season, or more than 50% of the total number of Botrytis fungicide sprays.
7. Apply Group 21 as a protectant spray only.
   • Do not apply more than two (2) consecutive sprays or more than three (3) times per crop season.
   • Exposure to Picolinamide (or any other Group 21 containing product) should not exceed thirty-three percent (33%) of the total period of protection needed per crop.
   • Picolinamide applications are to be made preventatively and no more than two (2) times in sequence before applying a fungicide with a different mode of action.
   • Continue alternation of fungicides between successive crops.
8. No specific resistance management strategy has been developed for low-risk fungicides, including those in Group M and BM. These products should be included in a management strategy as per label recommendations.