Professor Alan Matthews examines the likely impact on the EU agri-food sector of 25 per cent tariffs imposed by the United States: http://capreform.eu/trump-ii-tariffs-and-the-eu-agri-food-sector/
It's not good news for the sector which has an overall trading surplus with the US. Some niche or more up market products may be able to withstand the resultant price hike, but products more to the commodity end of the spectrum will be hit.
The EU doesn't have many options. The favoured one of retaliation is unlikely to help the sectors that will be most affected.