Dow plunges more than 450 points ahead of Fed testimony as Apple slams Nasdaq

Wall Street fell on Tuesday, with weakness in megacap growth stocks such as Apple and Tesla weighing on the Nasdaq, while investors assessed a slew of economic data and awaited remarks from Federal Reserve Chair Jerome Powell.In afternoon trading, the Dow Jones Industrial Average tumbled 459 points, or 1.2%, to 38,507, the S&P 500 slid 1.3%, and the Nasdaq was down 2%.Data showed US services industry growth slowed a bit in February amid a decline in employment, but a measure of new orders increased to a six ...