Bt maize

A number of different Bt maize events have been developed. Most of them (like MON810) produce a modified form of the Bt toxin Cry1Ab to protect the plants against the European corn borer (Ostrinia nubilalis). The toxin is produced in different concentrations in all parts of the plant. It primarily acts against butterflies in general, but direct and indirect effects on other non-target organisms have been shown.
Newer Bt maize events produce a form of Cry3b against root worms. In addition, hybrids of different GM maize events with toxin production and herbicide tolerance have been developed.
MON810 is the only Bt maize approved for cultivation in the EU, but banned in 5 EU memberstates.