When did Soviet authorities end their official support for Lysenko’s Lamarckism?

Soviet authorities officially supported Trofim Lysenko’s version of Lamarckism—often referred to as Michurinism—as the state-sanctioned biological doctrine starting in 1948. This support began to wane following the death of Joseph Stalin, as agricultural failures led to the abandonment of some of Lysenko’s specific measures.123

Official support for Lysenko’s doctrines effectively ended in 1964, following the political removal of Nikita Khrushchev, who had been a primary patron of Lysenko’s work. By early 1965, Lysenko was deposed as the director of the Institute of Genetics, his theories were officially discredited, and the Soviet Union began intensive efforts to reestablish orthodox genetics and Mendelian inheritance.12