What Is This Fusarium Graminearum, Dangerous Fungus Which Is Smuggled By Chinese Nationals To US?

The Federal Bureau of Investigation has arrested two Chinese nationals for allegedly smuggling a dangerous biological pathogen into the US, FBI director Kash Patel said in a post on X on Tuesday.

The individuals have been identified as Yunqing Jian and her boyfriend Zunyong Liu. They smuggled "Fusarium graminearum," which is an agroterrorism agent, into the US to research at the University of Michigan, where she works, Patel stated.

Explaining more about Fusarium graminearum, he said, "This fungus can cause a disease called "head blight,' a disease of wheat, barley, maize, and rice, causing significant health issues in both humans and livestock. It is responsible for billions of dollars in economic losses worldwide each year."

The FBI director claims that the evidence shows Jian Jian had expressed loyalty to the Chinese Communist Party and had received funding from the Chinese government for similar work on this pathogen in China.

Her boyfriend, who is also charged in the complaint, works at a Chinese university where he conducts research on the same pathogen, according to Patel. Liu is alleged to have first lied, then admitted, to also smuggling Fusarium graminearum into the US through the Detroit Metropolitan Airport in order to conduct research at the University of Michigan, he added.

The two Chinese nationals have been charged with conspiracy, smuggling goods into the United States, false statements, and visa fraud, he stated.

"This case is a sobering reminder that the CCP is working around the clock to deploy operatives and researchers to infiltrate American institutions and target our food supply, which would have grave consequences... putting American lives and our economy at serious risk," he claimed.

What Is This 'Fusarium Graminearum'?

Fusarium graminearum is a major fungal plant pathogen, also known as Gibberella zeae. It is the primary causal agent of Fusarium head blight (FHB), also called "scab," a devastating disease that affects wheat, barley, and other small grain cereals, as well as ear rot in corn. This pathogen is responsible for significant economic losses worldwide each year due to reduced crop yields and grain contamination with harmful mycotoxins, according to a journal.

How does Fusarium graminearum infect wheat and barley plants?

Fusarium graminearum infects wheat and barley plants primarily during their flowering stages, when the plants are most vulnerable. The infection process is initiated when fungal spores-mainly ascospores (sexual spores) produced in perithecia on crop residues-are released into the air and land on the open flowers or spikelets of wheat or barley. These spores can also be dispersed by rain splash or wind, and may land on other susceptible parts of the plant, a research report claims.

Upon landing, spores germinate within hours, especially under warm, wet, and humid conditions, which are highly favorable for infection. The germ tubes produced by the spores do not always target specific structures but grow on the surface of floral tissues such as glumes, lemmas, and palea. The fungus may enter the plant through natural openings like stomata or by directly penetrating soft tissues such as the anthers, embryo, or other floral structures. The hard, waxy surfaces of lemmas and palea usually prevent direct penetration, so the fungus relies on these alternative routes, another report adds.

Once inside, Fusarium graminearum initially grows in a biotrophic phase-living off the host without causing immediate cell death. During this phase, which lasts 24-84 hours, the fungus spreads intercellularly and produces mycotoxins such as deoxynivalenol (DON). After this period, the pathogen switches to a necrotrophic phase, actively killing host cells and rapidly colonizing the spikelet tissues. The fungus can spread from the initial infection site through the rachis (the central stem of the spike), affecting neighboring spikelets and causing symptoms such as bleaching and necrosis, a research report states.

The end result is shriveled, discolored kernels, and grain contaminated with harmful mycotoxins, which reduce crop yield and quality and pose health risks to humans and animals.