* OPEC backs extra 1.5 mln bpd output cut
* Deal has yet to win Russian backing
* IMF says coronavirus erases expectations for stronger growth
* U.S. crude stocks rise modestly; exports exceed 4 mln bpd (Updates prices to settlement, latest on OPEC)
By Devika Krishna Kumar
NEW YORK, March 5 (Reuters) - Oil prices fell on Thursday as the coronavirus epidemic showed no signs of slowing, feeding worries about the global economy and prompting investors to sell more risky assets like stocks and crude oil and park money in safe havens.
Oil's losses came even as OPEC agreed to cut crude output by an extra 1.5 million barrels per day (bpd) in the second quarter, its deepest cut since the 2008 financial crisis.
The group made its action conditional on Russia and others joining. Analysts and traders said global oil markets were likely to be oversupplied in the second quarter as demand plummets.
Brent crude fell by $1.14, or 2.2%, to settle at $49.99 a barrel while U.S. West Texas Intermediate (WTI) ended the session down 88 cents, or 1.9%, at $45.90.
OPEC will propose the new 1.5 million bpd cut be extended until the year end, sources said.
Russia has so far indicated that it would back an extension rather than deeper production cuts.
"Russia has so far dragged its feet in committing to more cuts," Capital Economics analysts said in a note.
"OPEC+ negotiations tomorrow are likely to be more contentious than today's meeting. That said, the risk of a pandemic has escalated in the last week, and this may persuade Russia to agree to additional cuts."
Russia, which has co-operated on output policy since 2016 in the informal group known as OPEC+, has in the past been hesitant during talks and then signed up at the last minute. Moscow will take part in the OPEC+ ministerial meeting in Vienna on Friday.
Russia is fiscally prepared to cope with a drop in oil prices, Finance Minister Anton Siluanov said, but did not predict Russia's decision on deeper output cuts.
"In our current projection, world oil demand is expected to fall 2.7 million barrels per day in the first quarter. This is a massive drop, and it shows the scale of the problem OPEC+ faces," said Ann-Louise Hittle, vice president at energy consultancy Wood Mackenzie.
"Whether Russia will agree to the cuts is the million-dollar question. Given their history of co-operation with OPEC, we expect they will agree."
The coronavirus outbreak has slammed oil demand. Forecasts for growth in crude demand in 2020 have been slashed, as factory operations, travel and other economic activities around the world have been curtailed.
Oslo-based Rystad Energy now predicts global oil demand will grow by 500,000 bpd in 2020, down from a February forecast of 820,000 bpd.
The head of the International Monetary Fund said the global spread of the virus has crushed hopes for stronger economic gains this year.
China's top gas importer, PetroChina, has declared force majeure on natural gas imports because of the outbreak.
Prices found some support early in the session after a lower-than-expected rise in crude oil inventories in the United States, alleviating some concern about oversupply in the world's biggest oil consumer.
Reporting by Devika Krishna Kumar Additional reporting by Bozorgmehr Sharafedin, Jessica Jaganathan in Singapore Editing by David Evans, Lisa Shumaker and David Gregorio