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Insect Resistance Management Requirements

New biotechnology products and their usage continue to dramatically increase, vividly changing the way seed is purchased and how grain is marketed. With these changes come increasing pressure from technology providers to ensure that the licensing agreements among growers are followed strictly.  Click here for the 2008 Insect Resistance Management (IRM) guidelines.

This increased monitoring of compliance is designed to ensure that corn growers wisely implement an Insect Resistance Management (IRM) program when using Bt insect protection products. Planting refuge areas equivalent to at least 20 percent of each farm’s acreage is thought to be critical in reducing the potential development of resistant insect populations. This refuge needs to be within one-half mile from YieldGard® Corn Borer products, and must be adjacent to products with the YieldGard® Corn Rootworm trait.  Click here for the 2008 Insect Resistance Management (IRM) guidelines.
 
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Kentland, IN 47951
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YieldGard® Corn Borer and Herculex™ Refuge Requirements

Refuge should be established as follows

  • On each farm, plant at least 20% of corn acres with non-Bt corn. The non-Bt corn can be treated with insecticides only when the level of pest pressure meets or exceeds economic thresholds. Sprayable Bt insecticides must not be applied to the non-Bt refuge corn.
  • Plant the refuge (non-Bt corn) within, adjacent to, or near Bt cornborer fields. The refuge must be placed within 1/2 mile of the Bt corn borer field (1/4 mile or closer preferred).
  • Can include the following corn options: YieldGard Rootworm, Roundup Ready ® corn, conventional corn, conventional corn, but no other Bt product for corn borer management.

YieldGard® Rootworm Refuge Requirements

Plant a minimum of 20% non-CRW corn refuge

Place refuge product adjacent to or within YGRW field

  • Adjacent refuge field can be separated by a road, fence, narrow grass waterway or drainage ditch.

Refuge Management

  • Refuge products and YieldGard Rootworm products must be planted following the same previous crop.
  • Can treat refuge for larval CRW and/or other soil pests with soil-applied, seed-applied, or foliar-applied insecticides.
  • Can treat refuge for late season pests, e.g., corn borer, CRW adults– however the YGRW field must also be treated.
  • Can include the following refuge corn options: YGCB, HX, Roundup Ready corn, and conventional corn, but no other Bt product for CRW management.

YieldGard® Plus

YieldGard Plus (YGPL) products are stacked with YieldGard Corn Borer and YieldGard Rootworm.

Refuge Requirements
Option 1: Common Refuge

  • Plant a minimum of 20% non-Bt corn refuge that will serve as refuge for both Bt technologies.
  • Place refuge within or adjacent to YGPL field.

Option2: Separate Refuge for Each Bt Technology

  • Place corn rootworm refuge within or adjacent to YGPL field.
  • Place corn borer refuge in field or within 1/2 mile (1/4 preferred) of YGPL field.

Refuge Management

  • Must use same crop rotation as YGPL for refuge, but can be any rotation for CB if a separate refuge.
  • Can treat for larval CRW and/or other soil pests with soil-applied, seed-applied, or foliar-applied insecticides.
  • Can treat refuge for late season pests, e.g., corn borer, CRW adults – however the YGPL field must also be treated.
  • If YGCB is used as the CRW refuge, then a separate refuge must be planted within 1/2 mile that would serve as the corn borer refuge; the corn borer refuge can be treated for CB or other corn pests when CRW adults are present.

Refuge Planting Recommendations

Any non-Bt corn acres planted on a grower’s farm near Bt corn can serve as a refuge.

  • Plant a refuge on every farm where Bt products are planted.
  • Plant the refuge close to, or at the same time as, the Bt corn.
  • Manage the refuge the same as Bt corn is managed. Reducing inputs or putting the refuge on marginal land merely reduces the effectiveness of the refuge.
  • Plant only non-Bt corn in the refuge. Mixing non-Bt seed with Bt seed for use in the refuge is not permitted.
  • Unirrigated pivot corners do not qualify as refuge acres.
Refuge Requirements

% Refuge 20% non-Bt corn borer corn 20% non-YieldGard Rootworm corn
Configurations Block, Perimeter, Split Planter Separate refuge within a 1/2 mile (1/4 mile preferred) Block, Perimeter, Split Planter Separate refuge adjacent to or within your field
Consecutive Number of Refuge Rows in Strips Using a Split Planter Configuration, plant a minimum of 4 rows (6 preferred) of a refuge product Using a Split Planter Configuration, plant a minimum of 6 rows (12 preferred) of a refuge product
Bt Refuge Configurations
Examples of Within Field Configurations
Examples of Adjacent Field Configurations
 
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