Business are collapsing in Ireland because of the slump in the £/€ value. Ireland's mushroom business exports most of it's produce to the UK. The fall in the value of the pound has wiped out the profits from these businesses. So 5 of the 60 farms in Ireland have closed.
Expect more of this as Breixt progresses.
Source: Reuters News - Collapsing mushroom sector exposes flaws in Ireland's Brexit response