By Noe Torres

MEXICO CITY (Reuters) - Mexico's economy will likely slip into recession if U.S. President Donald Trump follows through on a threat to impose tariffs on Mexican exports to the United States, a Reuters poll of market analysts showed on Wednesday.

A lurch into recession would be a blow to Mexican President Andres Manuel Lopez Obrador, who took office in December vowing to lift lackluster growth, but presided over a contraction in the economy during the first quarter of this year.

Trump on Thursday vowed to slap escalating tariffs of 5% from June 10 on all Mexican goods if Mexico's government does not contain a tide of migrants from Central America crossing the U.S. border.

Reuters polled 17 economists and financial market analysts on whether Latin America's no. 2 economy faced recession. Ten of them saw it as "likely" if Trump imposed tariffs, which could rise as high as 25% by October if no agreement is reached.

Four of the analysts saw recession as "very likely." The remainder said they believed the prospect was "unlikely."

A recession is generally defined as two consecutive quarters of economic contraction.

As a proportion of Mexico's total U.S. exports in 2018 - $347 billion, according to U.S. data - a 5% tariff implies costs of roughly $1 billion between June 10 and 30.

If the tariffs rise further, that cost, too, would surge.

Mexican officials have been scrambling to reach an agreement with the Trump administration since the U.S. president announced his threat on Twitter last Thursday.

A delegation led by Mexican Foreign Minister Marcelo Ebrard is in Washington to broker a deal. Ebrard is due to hold talks with U.S. officials led by Vice President Mike Pence and Secretary of State Mike Pompeo later on Wednesday.

Mexico's economy shrank by 0.2% quarter-on-quarter in the January-March period, prompting private sector analysts and authorities to pare back forecasts for growth this year.

A day before Trump announced his plan to put pressure on Mexico, the central bank cut its 2019 Mexican growth forecast by three tenths of a percentage point to a range of 0.8%-1.8%.

Lopez Obrador, who has defied pessimism on the outlook by insisting the economy can grow by 2% this year, has said getting a deal with the U.S. government is paramount.

Irrespective of whether Trump imposes tariffs, 15 of the 17 analysts polled said the Mexican central bank would keep its benchmark lending rate unchanged at 8.25% when it makes its next monetary policy decision at the end of June.

The other two analysts predicted the bank would raise its benchmark interest rate if the tariffs were introduced.

A majority of the analysts said the bank could opt to intervene on currency markets to head off the risk of a disorderly depreciation of the peso in the event of tariffs.

The peso has fallen by around 2.5% against the U.S. dollar since Trump's tariff threat last week.

(Polling by Noe Torres in Mexico City, Gabriel Burin in Buenos Aires, Sharay Angulo in Mexico City; Editing by Dave Graham, Bernadette Baum and Susan Thomas)