Brazilian news reported last week that GM maize fields are being destroyed by the pest the crop was designed to resist, the Fall army worm. Brazilian news reported last week that GM maize fields are being destroyed by the pest the crop was designed to resist, the Fall army worm. Farmers have reported that in the Federal District around the nation’s capital Brasília, and the state of Paraná, growing resistance in pests to the crop’s toxins is making GM-technology redundant. The maize variety is sold under the name Herculex.