Vultures circle Berlusconi's Forza Italia as support ebbs away

* Forza Italia lawmakers could jump ship if EU polls go badly

* Berlusconi's woes likely to strengthen government

* Would possibly signal Berlusconi's retreat from politics

* Forza Italia in prolonged poll decline

By Angelo Amante and Crispian Balmer

ROME, April 14 (Reuters) - Former Prime Minister Silvio Berlusconi could suffer mass defections from his Forza Italia group if it performs badly in next month's EU elections, putting the very future of the group at risk, party politicians said.

Any fragmentation of Forza Italia would reinforce the position of Deputy Prime Minister Matteo Salvini, who heads the rightist League, as undisputed leader of Italy's conservative bloc, and potentially strengthen the government in parliament. It would also almost certainly trigger Berlusconi’s retreat from frontline politics and open the way for a new leadership to try to rebuild the once dominant moderate, centre-right, now under siege from eurosceptic nationalist groups. Berlusconi's political obituary has been written repeatedly in the past, only for the 82-year-old media tycoon to defy the naysayers and reclaim a central role in Italian public life. But with his party's polling numbers in a prolonged decline and with his once-junior partner, the League, now Italy's most popular party, Forza Italia veterans are growing anxious.

"For our future it's very important that we get at least 10 percent at the European election," said a senior Forza Italia lawmaker and former minister who asked not to be named.

"Below that psychological threshold people will jump ship and try to join up with the League. It's Newton's rule of gravity, larger forces pull in little ones," he told Reuters.

Opinion polls since the start of April have put the party at anywhere between 8.7 and 12.1 percent, down from 14 percent it took in the 2018 national election and compared to a 30.5-35.7 percent banding for the League.

"If Forza Italy is unable to redefine its leadership and its agenda, it runs big risks," Roberto Weber, head of the Ixe polling institute, told Reuters.

DESERTERS

Although the League and Forza Italia ran together in last year's ballot, their relationship has soured since Salvini abandoned his allies and formed a coalition with the anti-establishment 5-Star Movement -- Berlusconi's bete noire.

The two groups still stand united in local elections, but the League has suggested it might not tie the knot again at a national level, worried that being associated with the elderly, out-of-mode Berlusconi would dent its newfound popularity.

"The longer we govern with 5-Star, the more it enters the public conscience and it would be hard to understand why the League would run with the centre-right," said Riccardo Molinari, the League's parliamentary party leader in the lower house.