Translate the following English sentence to French:
"It is not food aid that has ruined agricultural production in many African countries, however. It is the iron grip of huge European and American industrial or agricultural concerns, which have imposed the cultivation of hevea, coffee, groundnut, cotton and even out-of-season fruit and vegetables for the European market, at the expense of their own food crops."
Mais ce n' est pas l' aide alimentaire qui a ruiné la production agricole dans nombre de pays d' Afrique, c' est le talon de fer des grands groupes industriels ou agricoles d' Europe, d' Amérique, qui ont imposé les plantations d' hévéa, de café, d' arachide, de coton, voire de primeurs à contre-saison pour le marché européen, au détriment des cultures vivrières.