Forskere i Skotland for eksempel, har gensplejset elmetræer for at gøre dem resistente over for elmesyge, der overføres af en bark bille, og har ramt over 20 millioner træer i Storbritannien siden 1970 og andre millioner i resten af Europa.
Researchers in Scotland, for instance, have modified elm trees to make them resistant to Dutch elm disease which, carried by a bark beetle, has affected over 20 million trees in the UK since 1970 and millions more across Europe.