Seed and Seedcare resources

Insect resistance management

Bt corn must have a refuge.

This is a requirement set by the Canadian Food Inspection Agency. It is also a strategy endorsed by leading scientists to reduce the risk of insect populations developing a resistance to Bt corn.Syngenta is committed to following and supporting the refuge requirements set by the Canadian Food Inspection Agency.

Therefore, all growers must sign a Syngenta Stewardship Agreement before ordering any Agrisure insect protected corn for the 2017/2018 sales season, and continue to support the best management practices to reduce the potential risk of developing resistance to either the European corn borer (ECB) or corn rootworm (CRW) traits.


  • Lead to insect resistance 
  • Slow down the introduction of new corn technologies that provide additional insect protection
  • Affect individual grower access to Agrisure traited products


Scout refuge plantings to determine the level of insect pressure in your field. Then scout the Agrisure insect-protected hybrids to note their effectiveness and look for signs of damage that may indicate resistance to either the Bt trait or the CRW trait. If concerns arise, please contact your local Syngenta Agronomic Sales Representative immediately for further field investigation.


It is important to recognize that different products may have different Insect Resistance Management (IRM) requirements. On-farm mixing of any seed is not an approved method. Syngenta is pleased to provide hybrids with E-Z Refuge for built-in compliance.

NK Brand products that fall into this refuge include:

Minimum Refuge Requirement

Location and Row Spacing


 Agrisure 3000GT
 Agrisure Viptera 3111

 Agrisure Viptera 3110

 Agrisure Artesian




Adjacent to, or within Bt field

(4 row minimum)

• Single Bt trait to control rootworm with or without single Bt trait to control ECB and/or Bt trait to control Multi-Pest Complex™

• Appropriate size to ensure enough refuge mates available

• Refuge positioned to best suit rootworm behaviour (greater resistance risk)

 Agrisure Viptera 3220 E-Z Refuge

 Agrisure 3122 E-Z Refuge


E-Z Refuge


5% appropriate refuge material blended into the bag

• Dual Bt trait to control European corn borer (ECB) and/or Bt trait to control Multi-Pest Complex™

• Appropriate amount to ensure enough refuge mates available

• Additional convenience to ensure refuge is planted in all fields

*Multi-Pest Complex includes black cutworm, Western bean cutworm, fall armyworm, corn earworm and common stalk borer.

The Canadian Corn Pest Coalition, in collaboration with the Ontario Corn Committee and the Canadian Seed Trade Association and industry have developed a web-based calculator to help growers plan how to meet the minimum refuge requirements for each Bt corn hybrid on their farm. The calculator can be accessed at .

Refuge can be planted as a block, strips within the field, perimeter around the field, adjacent or a separate block within a ½ mile of the field. 

  • ½ mile option may only be used for ECB refuge 
  • A neighbour’s field does NOT meet the refuge requirements

Remember when calculating a refuge, the calculation must be based on total corn acres.


There are several resources available to assist with insect resistance management in Canadian fields:

  • For information related to Western bean cutworm, please click here.
  • Further product stewardship and weed management information can also be found at the following:
    • Syngenta Customer Interaction Centre – 1-87SYNGENTA (1-877-964-3682)
    • CropLife Canada

Before opening a bag of seed, be sure to read and understand the stewardship requirements, including applicable refuge requirements when planting insect protected traits as set forth in the Syngenta stewardship/technology agreement that you sign. By opening and using a bag of seed, you are reaffirming your obligation to comply with those stewardship requirements.
​​​​​​​To view recommended planting layouts, maps and configurations, please visit the CANADIAN CORN PEST COALITION at or contact us for a Grower’s Handbook: 1-800-756-7333.