Central Romana makes up most of the sugar export and almost all of the molasses, all of it to the USA. Quite frankly, sugar csne plantations and mills exists msinly to satisfy the USA since almost all that is harvested in the DR goes to the USA and the purpose the modern sugar cane industry was created starting at the end of the 1870's was always because of the USA. Without the USA, there would hardly be sugar cane plantations in the DR. In fact, the Central Romana was created mostly by American investors from the NYC area. Until the arrival of American investors (along with some Cubans and Puerto Ricans) and created the modern sugar industry, what existed was on a rather small scale and depended almost entirely on Dominican labor. It was with the creation of the modern sugar industry that the American et al investors preferred to import foreign labor into the DR, first some Puerto Ricans, then Covolos from the British West Indies, and in the 1920's Haitians. Keep in mind that when Haitians began yo be imported to work in the sugar plantations, the DR and Haiti were under US military occupations and these workers essentially went to work in American-owned sugar plantations as most at that time were owned by Americans. Until then Haitian that migrated to work in the DR were very few few since in no sector that was the norm. Very often the owners didn't live in the DR, but rather in the USA, especially NYC and its suburbs spanning into Westchester County in NY, Southwestern Connecticut, and Northern New Jersey. Trujillo basically expropriated (forced sale) most of the sugar plantations and mills owned by the Americans. At the time of his death the csmpaign had started in what would had ended as the expropiation of Central Romana itself, but what happen in May 1961 put an abrupt end to that.
Sugar makes up a very small part of Dominican exports and anything related to the sugar industry is a drop in the economic bucket.
The one issue this could create as a ban of importing sugar from the Central Romana is essentially a ban on importing Dominican sugar since it mskes up such a large percentsge and from its creation the Central Romana has exported 100% of its sugar to the USA, is the effect on the sugar quota. All the other sugar mills can't supply the part of the quota supplied by the Central Romana. So, inevitably for the first time ever the DR could not fulfill the sugar quota it has with the USA. This could hsve repercussions on the agreement as it would be broken by one of the parties despite it was created by the other one.