In the 1940s, common ragweed spread with American agricultural aid meant to rebuild Japan, but it became widespread across roadsides, fields, and cities nationwide and contributed to seasonal hay fever

Following the war, food shipments unintentionally brought common ragweed seeds to Japan, where they adapted to the altered ecosystems resulting from the conflict. This species soon emerged as a major trigger for seasonal allergies among Japanese patients, with its presence linked to the nation’s initial documented instance of pollinosis. Today, ragweed continues to propagate unchecked, posing ongoing health challenges each year.
Read more at the source

Disclaimer: The content of this post is sourced from external sites and is for informational purposes only. All rights and credits belong to the original authors and publishers.