Plants whose traits can be modified to survive a disease or insect have made inroads into Canadian agricultural practices. Cereal rusts which can destroy the majority of areas seeded to wheat, was controlled in 1938 by breeding strains which were rust-resistant. This strain was successful until around 1950, when again a new variety of rust broke out, and again a new species of wheat called Selkirk was developed which was rust resistant. Biotechnology is the center of new research and regulations affecting agriculture this century.