Within 4 years of introducing GM maize to South Africa, the target insect, the African Stalkborer (Busseola fusca) had caused severe damage to maize crops grown within every irrigation scheme in South Africa. Farmers were advised and forced to to spray with insecticide at increased cost. Monsanto has responded by adding more insecticide producing genes which exude toxins. What started off with one added gene has now grown to many added toxic producing genes. The stalk borers marked propensity to build up resistance to these stacked genes gives cause for concern as Monsanto just keeps on adding more and more insecticide exuding genes to it's patented crops.