The "unprecedented public health emergency" surrounding the coronavirus has forced the cancellation of the Royal Norfolk Show for only the second time in its history outside of wartime.
The two-day show, which attracts 85,000 visitors, was due to take place on at the beginning of July.
The last time the show was cancelled was in 2001 in response to an outbreak of foot and mouth disease, which affects farm animals.
Greg Smith, Chief Executive of the Royal Norfolk Agricultural Association said: “I am extremely sorry to have to announce this news and know that many people will share our disappointment."
An independent study between 2018-2019 by the School of Economics at the University of East Anglia revealed that the Royal Norfolk Show contributes around £20 million annually to the local economy.
The show organisers say they will be in touch with ticket holders, trade stands, exhibitors and suppliers as soon as possible.