“Fusarium graminearum”, a toxin smuggled into the US by a Chinese scientist now facing charges, is a fungus that can wipe out wheat and barley crops. A research professor of plant pathology says the case highlights serious vulnerabilities in American agricultural biosecurity: https://theconversation.com/what-is-fusarium-graminearum-the-fungus-a-chinese-scientist-pleaded-guilty-to-smuggling-into-the-us-261744