Feb 18 (Reuters) - Wall Street's main indexes opened

higher on Tuesday, as investors focused on potential tariff

developments and the U.S. Federal Reserve's interest-rate

strategy following last week's drop in Treasury yields.

The Dow Jones Industrial Average rose 37.8 points, or

0.08%, at the open to 44583.91. The S&P 500 rose 7.0

points, or 0.11%, at the open to 6121.6​, while the Nasdaq

Composite rose 63.8 points, or 0.32%, to 20090.554 at

the opening bell.