What is Fusarium graminearum, the fungus US authorities say was smuggled in from China?

Boston Globe

3 days ago

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Toxic plant pathogens that a Chinese scientist entered the US last year stashed in his backpack.
Uncredited/Associated Press
What is Fusarium head blight?
Fusarium graminearum causes a disease called Fusarium head blight that can wipe out cereal crops such as wheat, barley and maize and rice — it inflicts $1 billion in losses annually on U.S. wheat and barley crops, according to the U.S. Department of Agriculture.
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It isn't the only fungus to cause Fusarium head blight, but it's the most common culprit in the U.S. The fungus infects plants early in the growing season, shriveling wheat grains and blanching crop heads a whitish-tan color. It also causes a toxin to accumulate in wheat kernels that can make them unsafe for people and livestock to eat.
Nicknamed 'vomitoxin' because it's most known for causing livestock to throw up, it can also cause diarrhea, abdominal pain, headache and fever in animals and people.
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Wheat and other grain crops are screened for various toxins, including Fusarium graminearum, before they can be used to feed animals and humans. Farmers have to throw out any infected grains, which can cause devastating losses.
'It's one of the many problems that farmers have to deal with that risks their livelihood,' said David Geiser, a Fusarium expert at Penn State.
A colonization of Fusarium head blight, a costly fungal disease, growing on field-grown hemp in Kentucky on Sept. 29, 2020.
Uncredited/Associated Press
What are the accusations?
Although Jian and Liu are accused of smuggling Fusarium graminearum into the country, the fungus is already prevalent in the U.S. — particularly in the east and Upper Midwest — and scientists have been studying it for decades.
Researchers often bring foreign plants, animals and even strains of fungi to the U.S. to study them, but they must file certain permits before moving anything across state or national borders. Studying the genes of a foreign fungus strain, for example, can help scientists learn how it tolerates heat, resists pesticides or mutates.
'We look at variations among individuals just like we do humans,' said Nicole Gauthier, a plant pathologist at the University of Kentucky who studies Fusarium.
That said, it's unclear why the Chinese researchers might have wanted to bring that strain of Fusarium graminearum into the U.S. and why they didn't fill out the proper paperwork to do so.