The team has also documented early infections in hemp, with some occurring months before visible symptoms develop. This poses a challenge for farmers, as the disease can go undetected until significant damage has occurred.
“Infections can begin long before symptoms are noticeable, which makes early detection difficult,” Gauthier said. “But it also means there’s a window for intervention that could prevent the disease from spreading further.”
One of the main concerns in this research is that the Fusarium fungi can produce harmful chemicals called mycotoxins, such as DON and T-2. These compounds pose risks to human and animal health, making their presence in hemp particularly concerning for producers in the animal feed market.
“As hemp becomes more widely used in animal feed, it’s essential to ensure that crops are free from harmful mycotoxins,” Gauthier said. “Our research confirms that mycotoxins are produced in Fusarium-infected hemp, and further work is needed to understand the full scope of the risk.”
Beyond field infections, researchers believe that Fusarium contamination could persist in stored hemp. This raises questions about current storage practices and the risk of further contamination during processing.
“It’s looking like Fusarium can survive in stored hemp, impacting product quality even after harvest,” Gauthier said. “This highlights the importance of careful post-harvest management.”
The research team’s long-term goals include developing hemp cultivars resistant to Fusarium head blight and investigating potential fungicide treatments. Currently, no fungicides are approved for use on hemp for this disease, and resistant cultivars have yet to be developed. However, the UK Hemp Research, Extension and Education program’s ongoing work is helping to lay the groundwork for these solutions.
Visit the UK Hemp Research, Extension and Education program at Martin-Gatton CAFE at hemp.ca.uky.edu.
This material is based upon work supported by the Agricultural Research Service, U.S. Department of Agriculture, under Agreement No. 58-5042-1-003 and 59-8060-4-002. Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the Department of Agriculture.
Source : uky.edu