Potato – Target Spot (early Blight)

Crop(s):          Potato

Disease(s):     Target spot (early Blight)

Resistance management strategy for:

Group 2 Dicarboximide;
Group 3 Demethylation inhibitors (DMI);
Group 7 Succinate dehydrogenase inhibitors (SDHI);
Group 7+3 SDHI + DMI;
Group 7+12 SDHI + phenylpyrroles;
Group 9 Anilinopyrimidine;
Group 11 Quinone outside Inhibitor (QoI); and
Group 11+3 QoI + DMI.

 

Guidelines:

  1. Limit the use of Group 2, 3, 7, 9 or 11 fungicides to periods when conditions favour disease development, apply these fungicides preventatively before disease symptoms are visible.
  2. Do not apply more than six Group 2 or 3 sprays in one season. Apply no more than two consecutive sprays of a Group 2 or 3
  3. If used solo, apply Group 7 fungicides in strict alternation with fungicides from a different cross resistance group. If fungicides containing Group 7 are used in mixture, apply a maximum of 2 consecutive applications.
  4. Apply no more than two consecutive sprays containing a Group 9
  5. Do not apply more than two consecutive Group 11 sprays per crop. If consecutive applications of Group 11 containing 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 containing fungicide is used again, either in the current or following season. When using a Group 11 fungicide in-furrow at planting, use a fungicide from a different group as the first foliar spray.
  6. 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.
  Maximum recommended number of sprays which can contain Group:
 

 

 

Total number of early blight targeting sprays

  2 3 7 (Incl. 7+3, 7+12) 9 11 (Incl. 11+3)
1 1 1 1 1 1
2 2 2 1 1 1
3 2 2 1 1 2
4 3 3 2 2 2
5 4 4 2 2 3
6 4 4 2 2 3
7 5 5 2 3 3
8 6 6 2 3 3
9 6 6 3 3 3
10+ 6 6 3 3 3

 


URL: https://croplife.org.au/resources/programs/resistance-management/potato-target-spot-early-blight/
Content last updated: June 26, 2024

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 www.apvma.gov.au

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 26 June 2024. All previous versions of this strategy are now invalid.