Brexit crisis tipped for British asparagus as EU seasonal workers stay away

* Asparagus crop poses first big labour test after Brexit

* Farmers fear eastern European workers will stay away

* UK launches pilot trial in Russia, Ukraine, Moldova

By James Davey and Kate Holton

ROSS-ON-WYE, England, March 18 (Reuters) - For almost 100 years, Chris Chinn's family has farmed asparagus in the rolling hills of the Wye Valley in western England.

This year, he fears uncertainty around Britain's departure from the European Union will keep his eastern European workers away and the asparagus will stay in the ground.

Asparagus grown in Britain is feted by chefs as among the world's best but the seasonal worker shortage threatens the country's asparagus industry and the viability of Chinn's Cobrey Farms business.

It is a predicament shared by many British fruit and vegetable farmers, almost totally reliant on seasonal migrant workers from EU member states Romania and Bulgaria taking short-term jobs that British workers do not want.

At Chinn's farm, which turns over more than 10 million pounds ($13 million) a year, the workers pick the premium asparagus spears that can grow up to 20 cm a day by hand. Sometimes they pick them twice a day before dispatching them to customers such as Marks and Spencer. and Britain's biggest supermarket, Tesco.

"It is incredibly clear cut - there is no UK asparagus on your supermarket shelves without seasonal migrant workers," Chinn, whose great grandfather started as a tenant farmer in 1925, told Reuters.

"We're really at the point where we either import the workers or we import the asparagus."

Britain's asparagus season is short and early - traditionally running from April 23, known as Saint George's Day, to Midsummer's Day in mid-June. It will be the first big test of the 2019 seasonal labour crisis.

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This year Chinn's team has had to work much harder to recruit Romanians and Bulgarians who are perplexed by the long Brexit process as Prime Minister Theresa May seeks parliament's approval for a divorce deal with the EU. They are also wary of the welcome they will receive from Britons, who voted in 2016 to leave the EU.

Though Cobrey Farms has signed up 1,200 workers who are due to start arriving at the end of this month, Chinn fears many will not turn up. He does not think he will be able to harvest the entire crop, meaning valuable asparagus will be left in the fields.

"If we're 20 percent short of people then we will harvest 20 percent less asparagus," said Chinn. "UK agriculture's not a high-margin game, so 20 percent less means we're in loss-making territory. Fifty percent could sink us."