Bt Crop Refuge Area
Fields with Bt crops are required to provide refuge areas to
help control resistance. The refuge area supply a source of wildtype (non-mutant)
insects to mate with possible resistant insects to produce nonresistant
insects.
Bt
crops are planted with alternating rows of regular non-Bt crops.
The insects that have developed resistance to Bt have more chances
of mating with an insect that has not developed resistance to Bt.
By the laws of genetics, the progenies produced will be insects that are
not resistant to Bt.

In the US, the EPA requires Bt corn farmers
implement refuge areas to these guidelines.
1. Growers may plant up to 80% of their corn acres with
Bt corn. At least 20% must be planted with non-Bt corn
(refuge area)
2. Refuge area mush be within, adjacent to or near the
Bt cornfields. it must be placed within 1/2 mile of the Bt
field.
3. If refuge are strips within a file, the strips should
be at least 4 rows. |