Japan asked importers not to impose any "unfair" import bans on its goods as a result of the nuclear accident that resulted from an earthquake and tsunami in the country on March 11.

A Japanese diplomat speaking at a meeting of the World Trade Organisation (WTO) on Tuesday said it was a matter of "regret" that there was unease among importers over the damage done to the Fukushima Daiichi nuclear plant on the country's northeast coast and subsequent radiation leaks.

"We request members not to impose unfair restrictions on Japanese exports," he told delegates.

Several countries have banned milk and produce from the areas near Japan's tsunami-damaged nuclear plant because of contamination fears.

Food makes up 1 percent of Japan's exports. (Reuters)