The Australian Wine Research Institute

Fungicide resistance management strategies

Grape downy mildew

 
Fungicide activity group(s) Resistance management strategy

Group 4 = D

(phenylamide)

Group 11 = K

(quinone outside inhibitor)

Group 40 = X

(dimethomorph)

Note: the new code is the number and the old code is the letter.
  1. Start disease control sprays when the vine shoots are approximately 20 cm long and continue spraying at intervals of 7–21 days using a protectant or non-phenylamide fungicide.

  2. When conditions favour disease development, apply two consecutive sprays of a Group 4 product. DO NOT apply more than two consecutive sprays of a Group 4 product. DO NOT apply more than four sprays of a Group 4 product per season.

  3. DO NOT apply more than three sprays per season of Group 11* fungicides. If two or three consecutive applications of Group 11* fungicides are used, then they must be followed by at least the same number of applications of fungicide(s) from a different group(s) before a Group 11* fungicide is used again, either in the current or following season.

  4. DO NOT apply more than three consecutive sprays of a Group 40 fungicide, and no more than a total of six sprays per season.
* A restriction of two applications per season for powdery mildew control in grapevines is now recommended by the CropLife Fungicide Resistance Management Review Group. A similar recommendation for the application of strobilurin sprays for downy mildew control is under review by this Group.

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