(Recasts with U.S. markets; changes dateline; previous LONDON)
By Herbert Lash
NEW YORK, May 1 (Reuters) - The dollar surged to a five-week high on Thursday against the euro, knocking commodities prices lower and lifting U.S. stocks in a rally led by technology bellwethers Apple Inc <AAPL.O> and IBM <IBM.N>.
Oil prices fell sharply as the dollar rose and Nigerian supply that had been disrupted was expected to resume following negotiations with unions to end a strike.
U.S. economic data suggested the Federal Reserve would put its monetary easing on hold, lifting the dollar against the euro and to a seven-week high against a basket of major trading currencies.
Investors took heart in the positive aspects of U.S. spending and core inflation data, as well as a manufacturing survey for April.
They also shrugged off higher-than-expected U.S. initial jobless claims a day after the Federal Reserve cut a benchmark interest rate to 2 percent to stimulate the flagging economy.
The Fed said it was worried about rising inflation expectations, suggesting an aggressive rate-cutting campaign was on hold. That helped bolster the dollar.
"The most important thing right now is the U.S. dollar," said Tim Smalls, head of U.S. stock trading at brokerage firm Execution LLC in Greenwich in Connecticut.
"As long as the dollar continues to rally as it's doing right now, commodities are going to come off and the inflation scare gets mitigated slightly."
Shares of Apple gained 2.5 percent and BlackBerry devices maker Research In Motion Ltd <RIM.TO><RIMM.O> jumped 4 percent in New York, pushing the tech-rich Nasdaq up 2 percent.
International Business Machines Corp, a tech services company, led the Dow's climb with a 2.2 percent gain.
As tech shares gained, energy companies' stocks fell, a trend aided by disappointing quarterly results from oil company Exxon Mobil Corp <XOM.N>, whose shares fell 4.8 percent.
At midday, the Dow Jones industrial average <
> was up 124.82 points, or 0.97 percent, at 12,944.95. The Standard & Poor's 500 Index <.SPX> was up 15.67 points, or 1.13 percent, at 1,401.26. The Nasdaq Composite Index < > was up 56.06 points, or 2.32 percent, at 2,468.86.U.S. Treasury debt prices turned negative as a rally in stocks gained strength, in part because the stronger dollar eased some investor worries about high energy costs and inflation.
The benchmark 10-year U.S. Treasury note <US10YT=RR> fell 8/32 to yield 3.76 percent. The 2-year U.S. Treasury note <US2YT=RR> fell 6/32 to yield at 2.36 percent. The 30-year U.S. Treasury bond <US30YT=RR> fell 11/32 to yield 4.50 percent.
European shares ended flat as vague merger and acquisition chatter supported miners, while consolidation hopes helped propel British Airways <BAY.L> higher.
The pan-European FTSEurofirst 300 index <
> ended up 0.1 percent at 1,339.02 points, with British shares unchanged at 6,087.3.Despite falling metal prices, Xstrata <XTA.L> and Anglo American <AAL.L> gained about 2 percent each.
British Airways <BAY.L> climbed 7.3 percent after the airline said late on Wednesday it was in discussions with two of its largest U.S. rivals, which a source briefed on the matter said was about a potential alliance.
Investors shrugged off data showing that growth in Britain's manufacturing sector slowed in April, as expected. But there was no let-up in inflationary pressures as firms ratcheted up prices at the fastest rate on record.
Investors also were optimistic after the Bank of England said the scale of losses and the economic fallout from the global credit crunch may not be as bad as feared and subprime losses could end up costing less than half market forecasts.
In the United States, manufacturing contracted for a third straight month in April and the number of workers claiming jobless benefits hit a four-year high in the latest week. But that was offset a bit by data showing personal spending in March was stronger than expected.
"It looks like we came in slightly above expectations, so this number is consistent with positive growth in the economy," said Michael Darda, chief economist at MKM Partners LLC in Greenwich, Connecticut.
"The idea that (a slowdown) is a deep and long collapse is just flatly incorrect. There's no evidence of that."
Oil prices fell. U.S. light sweet crude oil <CLc1> fell $2.84, or 2.5 percent, to $110.62 per barrel.
The dollar gained against major trading-partner currencies, with the U.S. Dollar Index <.DXY> up 0.91 percent at 73.269.
The euro <EUR=> fell 1.02 percent at $1.5456, and against the yen, the dollar <JPY=> rose 0.28 percent at 104.21.
Gold slipped to a four-month low below $850 an ounce as a the dollar's sharp rise lowered gold's appeal as an alternative investment and triggered a sell-off in precious metals. In midday New York trading, spot gold prices <XAU=> were down $19.95, or 2.29 percent, at $850.00.
Silver and palladium hit three-month lows, while platinum shed 3 percent to a one-month low below $1,850 an ounce.
In Asia, Japanese stocks retreated as investors booked profits following the market's biggest month of gains in 13 years. The Nikkei average <
> slipped 0.6 percent. (Reporting by Ellis Mnyandu and Gertrude Chavez-Dreyfuss in New York and Michael Taylor, Ikuko Kao, Tamora Vidaillet and Atul Prakash in London; Editing by Dan Grebler)