US STOCKS-Wall St falls in technical trade ahead of Fed rate decision
* Dow Chemical, DuPont jump on merger buzz
* S&P materials sector soars 3 percent on Dow, Dupont reports
* Energy stocks trim gains as oil recovery stalls
* S&P technology sector leads losers with 1.7 pct decline
* Indexes down: Dow 0.4 percent, S&P 0.8 percent, Nasdaq 1.5 percent (Updates to close, adds commentary)
By Sinead Carew
Dec 9 (Reuters) - U.S. stocks closed lower on Wednesday in a choppy session as oil resumed its decline and the S&P 500 index fell through a technical support level ahead of a Federal Reserve meeting next week that is expected to result in an interest rate hike.
After a morning rally the three major U.S. indexes fell as investors worried about slowing global economic growth, weak oil and the first U.S. rate hike in almost a decade.
Computer trading programs kicked in with a wave of selling when the S&P failed to stay above its 2,050 support level, according to Art Hogan, chief market strategist at Wunderlich Securities in New York. Continuación...