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Cambodian migrant workers carry their belongings as they arrive in the city of Poipet after crossing the Thai-Cambodian border, in the northeastern Cambodian province of Banteay Meanchey on Tuesday.

SAMUT PRAKARN, Thailand — Lek Numthong, who supplies foreign laborers for construction sites on the fringes of the Thai capital, normally has a truckload of workers eager to make a day’s wage. But his pick-up has been all but empty for a week.

Only two Burmese workers are sitting in the back.

About 200,000 Cambodians, a key component of the migrant workforce, have turned tail and gone home. The clumsy rhetoric that apparently precipitated their departure may be the first misstep in the efforts by the generals now running the country to revive an economy battered by months of political turmoil.

“They’ve scared them,” said Lek. “Almost every Cambodian worker without a permit has fled. Gone.”

Thailand’s military seized power last month in a bloodless coup, saying it acted to end half a year of often violent protests that triggered the removal of Prime Minister Yingluck Shinawatra. Her brother, Thaksin Shinawatra, ousted by the army in 2006, was premier for more than five years.

The junta rounded up activists and announced policies with a nationalist tinge it said would “get Thailand back in order”.

Last week, a junta spokeswoman said the army would “arrest and deport illegal migrants”. Unverified stories of Cambodians being beaten, or even killed, spread quickly through fields and construction sites, setting off a rush to the border.

The ministry of labor says about 70 percent of those who have left were in the building and farming sectors. Foremen at building sites, where casual workers earn the equivalent of less than $10 a day, have scrambled to find replacements.

Somchao Tanterdtham, Managing Director at N.C. Housing PCL, a real estate developer, says business has been hit. “I know that around 80 percent to 90 percent of workers have disappeared from some projects,” he said.

But workers from Myanmar, formerly known as Burma, have stayed put. They form the largest group among Thailand’s 2.3 million registered foreign laborers.

In Myanmar, newly emerged from nearly five decades of dictatorship and isolation, the labor market offers fewer options than Cambodia and its large garment industry. “Why would I go? There is no job for me in Burma,” said Than Za, as he picked lychees and dumped them in a large basket at an orchard in Rayong, 140 miles (85 miles) southeast of Bangkok.

Since the Cambodians started heading for the border, the military has denied there is any plan to deport migrant workers.

Foreign ministry officials met the Cambodian ambassador and said workers without papers were welcome to return to Thailand — and its better-paid jobs —once their documents were in order.

“Tightening regulations is not aimed at migrants but to punish those who take advantage of them,” Jeerasak Sukhonthachart, the ministry’s top official, told Reuters.

Southeast Asia’s wealthier economies are heavily reliant on migrant workers from their poorer neighbors. Thailand, the third region’s biggest importer of migrant labor after Malaysia and Singapore, has enforced regulations loosely and many workers face exploitation and ill-treatment.

Employers frequently confiscate identification documents to keep unregistered workers from running off and to maintain pay rates below the national minimum wage.

There are no official statistics on the number of undocumented workers in Thailand, but government estimates have put the figure at more than 1 million.

Christian Lewis, of political risk consultants Eurasia Group, said the recent tough talk was lip-service to the ultra-nationalists who are among the coup-makers most ardent supporters, and the effects of the exodus were likely to be shortlived.

“It will probably not see much serious follow-up action since certain sectors of the economy depend so heavily on imported labour,” Lewis said. “I don’t see it presenting an outsized risk to stability. It is unlikely to redraw the lines of support for the junta.”

Some employers on the ground remained unfazed. “We rely on technology more than human labor, so the impact should be limited,” said Prasert Marittanaporn, Senior Executive Vice President at CH Karnchang Pcl, one of Thailand’s largest construction firms.

At a Bangkok construction site, where more than 1,000 laborers poured cement and perched on the edge of unfinished flats well beyond their means, Cambodian worker Suphan, 42, thought many of his countrymen would return.

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