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Bacillus thuringiensis (Bt) Plant-Incorporated Protectants - page 16 / 30





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Bt Plant-Incorporated Protectants October 15, 2001 Biopesticides Registration Action Document

  • a.

    No planting of Bt-cotton south of Route 60 (near Tampa) in Florida,

  • b.

    Commercial culture of Bt-cotton is prohibited in the state of Hawaii,

  • c.

    Test plots or breeding nurseries established in Hawaii must be surrounded by 24 border

rows of a suitable pollinator trap crop regardless of the plot size and must not be planted within 3 miles of Gossypium tomentosum, d. Commercial culture, experimental plots and breeding nurseries of Bt.-cotton are prohibited in the U.S. Virgin Islands, and e. Commercial culture of Bollgard™ cotton is prohibited in Puerto Rico. Test plots or breeding nurseries established on the island of Puerto Rico must be surrounded by 24 border rows of a suitable pollinator trap crop regardless of the plot size and must not be planted within 3 miles of feral cotton plants.

Upon approval by EPA, test plots and/or breeding nurseries in Hawaii, the U.S. Virgin Islands, and Puerto Rico may be established without restrictions if alternative measures, such as insecticide applications, are shown to effectively mitigate gene flow.

  • c.

    Insect Resistance Management (IRM) Program

  • i.

    Bt Corn

The Agency has determined that the unrestricted use of Cry1Ab and/or Cry1F in corn is likely to lead to the emergence of resistance in one or more of the target insect pests unless measures are used to delay or halt the development of resistant insects. Because some corn pests also attack other crops, not only would the emergence of resistance affect the benefits of Bt corn, such insect resistance could also affect the efficacy of Bt cotton products and microbial formulations of Bt. The loss of Bt as an effective pest management tool – in field corn, sweet corn, or other crops – could potentially have serious adverse consequences for the environment to the extent that growers might shift to the use of more toxic pesticides and a valuable tool for organic farmers might be lost. The emergence of resistance in corn pests could also have significant economic consequences for corn growers. Therefore, EPA continues to require the registrants to implement an Insect Resistance Management (IRM) program to mitigate the possibility that pest resistance will occur.

The required IRM program for Bt corn has the following elements:

1] Requirements relating to creation of a non-Bt corn refuge in conjunction with the planting of any acreage of Bt field corn;

2] Requirements for the registrants to prepare and require Bt corn users to sign “grower agreements” which impose binding contractual obligations on the grower to comply with the refuge requirements;


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