What portion of corn fields must farmers plant to non-GMO hybrids to help slow the development of insect resistance in Bt GMO corn?

The correct portion of corn fields that farmers must plant to non-GMO hybrids to help slow the development of insect resistance in Bt GMO corn is known as the refuge. The term "refuge" refers to a designated area of non-GMO corn planted near Bt corn crops. This practice is essential because it provides a habitat for susceptible insect populations. By maintaining these populations, farmers can ensure that there are still insects that are not resistant to the Bt toxin produced by the genetically modified corn. This diversity among insect populations helps to reduce the chances of resistance developing over time.

The concept of the refuge is critical in integrated pest management strategies designed to prolong the effectiveness of Bt corn. Implementing the appropriate ratio between Bt corn and refuge areas is governed by specific guidelines that may vary based on the type of insect pest being targeted and the geographic location of the farming operation.

In contrast, the other terms refer to different agricultural concepts. "Residual" typically relates to leftover chemical residues in the field, "residue" refers to organic matter left in the field after harvest, and "cover crop" is a plant grown primarily for the benefit of the soil rather than for harvest. None of these concepts directly addresses the specific strategy required to mitigate insect resistance in the context of