Herculex and SmartStax hybrids (containing Cry1F) will provide enough protection to equal one spray application. I do not recommend spraying Cry1F fields at this time. However, research is currently underway to determine if a threshold may need to be created for Cry1F hybrids in cases when egg laying is extremely high in those fields. But at this time, I believe it would not be economic to spray fields with hybrids containing Cry1F. Keep in mind however that the non Bt refuge will see damage in these fields if threshold is reached in the refuge.