CBOT corn ends higher after back-and-forth trade

CHICAGO, April 7 (Reuters) - Chicago Board of Trade corn futures settled up Monday after a seesaw trading session with a barrage of headlines on the sweeping tariffs imposed by U.S. President Donald Trump on U.S. imports.

• CBOT May corn CK25 closed up 4-1/4 cents at $4.64-1/2 a bushel.

• Trump said he would impose an additional 50% duty on U.S. imports from China on Wednesday if the world's No. 2 economy did not withdraw the 34% tariffs it had imposed on U.S. products last week.

• China had struck back at U.S tariffs imposed by Trump with a slew of countermeasures, including extra levies of 34% on all U.S. goods.

• Heavy rain continued to fall in the U.S. Ohio Valley and northern Delta, where extensive flooding already occurred, stalling corn planting in these areas, according to weather forecaster Maxar.