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Photographer: Luke Sharrett/Bloomberg Photographer: Luke Sharrett/Bloomberg

OPEC has its work cut out to persuade the market that its output caps will stabilize oil prices -- and U.S. producers aren’t helping.

Crude settled below $50 a barrel in New York on Monday for the first time in more than a year and continued falling in after-hours trading. The slide began after data provider Genscape Inc. was said to report growing inventories at the biggest American storage hub and intensified as the U.S. Energy Department forecast higher output in the country’s shale plays.

Oil prices are on track for a third straight monthly decline despite efforts by OPEC, Russia and other major exporters to halt the slide. Crude had slunk near $50 in recent weeks but always rebounded. Crossing the threshold was “significant," said Michael Loewen, a commodities strategist at Scotiabank in Toronto.

“We’re probably going to see a supply slowdown in the U.S.," he said by telephone. “I do think that producers will react."

A dive for U.S. equities added to the pressure on Monday. The S&P 500 hit a 14-month low as investors anticipated a Federal Reserve interest-rate hike that could slow the economy.

READ: Rystad Sees Permian Oil Production Growing Despite Rig Slowdown

West Texas Intermediate for January delivery fell $1.32 to settle at $49.88 a barrel on the New York Mercantile Exchange. Bears gained steam after the official close, with oil falling to $49.01, the lowest level since September 2017. The WTI February contract fell to $49.47.

Brent for February settlement closed down 67 cents to $59.61 on London’s ICE Futures Europe exchange. The global benchmark traded at a premium of $9.41 a barrel to same-month WTI.

“There’s always a question mark over to what extent the OPEC countries and Russia will or will not fulfill their promises,” said Pavel Molchanov, a Raymond James & Associates Inc. analyst. “There is naturally some skepticism.”

It typically takes about six weeks for OPEC nations to implement supply changes, and Saudi Arabia, the group’s biggest producer, faces added political pressure from U.S. President Donald Trump to keep the taps open, Molchanov said.

Other oil-market news: Gasoline futures fell 1.7 percent to $1.4104 a gallon in New York trading.

A former lobbyist who’s helped drive the Trump administration’s policies to expand drilling on public lands is poised to take over at the U.S. Interior Department.

Interior Department. Kuwaiti Oil Minister Bakheet Al-Rashidi and two top executives of state-owned energy companies resigned in the latest sign of disputes within OPEC’s fifth-biggest producer.

— With assistance by Catherine Ngai, and Rakteem Katakey

( An earlier version of this story mistakenly said Brent crude had traded at discount to WTI. )