Integrated Crop Management

YieldGard® Rootworm corn requires a refuge

The EPA is requiring Monsanto to ensure that 20 percent of the planted acreage of YieldGard® Rootworm be set aside where non-Bt corn will be grown to serve as a refuge. These refuge acres will support populations of corn rootworm not exposed to the Bt protein and reduce the possibility of corn rootworm developing resistance to Bt corn. The corn rootworm populations in the refuges will help prevent resistance development when they cross-breed with insects in the Bt cornfields. This resistance management strategy was developed as a condition of the registration, and EPA will require routine monitoring and documentation that these measures are followed.

The following information on refuge requirements was modified from a Monsanto publication, "YieldGard Rootworm Insect Resistance Management-2003 IRM Guide." Anyone planting YieldGard Rootworm in 2003 must follow these refuge requirements.

Refuge requirements for the Corn Belt

Refuges must be established as follows:

Refuge planting requirements

Any corn hybrid that does not contain a Bt technology for control of western or northern corn rootworm and is planted within or adjacent to the YieldGard Rootworm field corn can serve as a refuge.

Refuge configuration options.

The refuge on each farm may be arranged in a number of configurations. These options offer the flexibility to easily incorporate an effective corn refuge into farm operations. Options include the following:

This article originally appeared on pages 18-19 of the IC-490 (3) -- March 17, 2003 issue.

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