What do your standards say about fumigation?
Fumigation is not permitted under organic standards; this applies to imported foods as well as those grown in the UK. There are a few specific countries whose conditions require fruit or vegetables to be treated before importation, such as with Argentinean citrus fruit. In this case the citrus fruit cannot be imported as organic because of the requirement that it must be treated. This would be the same for any other country or product where there was a legal requirement for fumigation.
Some supermarkets require routine fumigation of, for example, bananas. Organic standards prohibit this so organic fruit must be removed during fumigation and not put into the area until the fumigant has dispersed and broken down.