Translate the following English sentence to French:
"Wheat growers, in particular, will be affected very badly, which they already are because of a 15% fall in prices, but then there is also a tightening up on quality and with regard to the issue of protein crops."
Ce sont principalement les producteurs de blé qui seront très violemment touchés - et ils le sont déjà suite à une baisse des prix de 15 %.