SAO PAULO (Reuters) -Coffee buyers in the United States have started requesting to postpone imports of Brazilian coffee following a 50% tariff imposed on Brazilian goods by U.S. President Donald Trump, local exporters' group Cecafe said on Tuesday.

While the tariff took effect this month, Brazilian green coffee exports to all destinations fell 28.1% in July compared to the same month a year ago, to 2.45 million 60-kilogram (132.3 lb) bags, according to Cecafe data.

(Reporting by Roberto Samora in Sao Paulo; Writing by Andre Romani; Editing by Kylie Madry)