Wall Street's main indexes slide as investors shifted out of technology stocks

Wall Street's main indexes tumbled yesterday as investors shifted out of technology stocks in the face of rising Treasury yields.    Fresh U.S.-China concerns over trade offered also dampened investor sentiment.   The dow Jones plunged 0.9 percent, the S&P 500 tumbled 1.3 percent and the Nasdaq Composite index tumbled 2.1 percent.