According to the USDA, exports have risen virtually year-on-year since the late 1990s and account for 75 per cent of total production.

Even so, the 2003-04 season could be an exception with sendings forecast to fall 10 per cent to 24,750t, a consequence of low yields and a projected fall in domestic stock levels.

The US and Japan are the prime destinations but more growers are looking at the opportunities offered in the EU, especially Belgium, the Netherlands, Germany and more recently the UK.