"Ambrosia artemisiifolia" in Russia. In 2007 several "Ambrosia artemisiifolia" populations were glyphosate resistant, exclusively in the USA. "Ambrosia artemisiifolia" is an annual plant that emerges in late spring. The larvae feed on "Ambrosia artemisiifolia", "Ambrosia confertifolia" and "Ambrosia ptilostachya". The most widespread species of the genus in North America is "Ambrosia artemisiifolia".